Publications by authors named "Jian-Ke Sun"

30 Publications

  • Page 1 of 1

Hierarchically Porous Organic Cages.

Angew Chem Int Ed Engl 2021 May 23;60(22):12490-12497. Epub 2021 Apr 23.

MOE Key Laboratory of Cluster Science, School of Chemistry and Chemical Engineering, Beijing Institute of Technology, Beijing, P. R. China.

Imparting mesopores to organic cages of an intrinsic microporous nature to build up hierarchically porous cage soft materials is a grand challenge and will reshape the property and application scope of traditional organic cage molecules. Herein, we discovered how to engineer mesopores into microporous organic cages via their host-guest interactions with long chain ionic surfactants. Equally important, the ionic head of surfactants equips the supramolecularly assembled porous structures with charge-selective uptake and release function in solution. Interestingly, such hierarchically porous organic cage can serve as a nanoreactor once trapping enzymes within the cavity, which show 5-fold enhanced activity of enzymatic catalysis when compared with the free enzymes.
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http://dx.doi.org/10.1002/anie.202100849DOI Listing
May 2021

Polymer-Derived Heteroatom-Doped Porous Carbon Materials.

Chem Rev 2020 09 6;120(17):9363-9419. Epub 2020 Aug 6.

Department of Materials and Environmental Chemistry, Stockholm University, 10691 Stockholm, Sweden.

Heteroatom-doped porous carbon materials (HPCMs) have found extensive applications in adsorption/separation, organic catalysis, sensing, and energy conversion/storage. The judicious choice of carbon precursors is crucial for the manufacture of HPCMs with specific usages and maximization of their functions. In this regard, polymers as precursors have demonstrated great promise because of their versatile molecular and nanoscale structures, modulatable chemical composition, and rich processing techniques to generate textures that, in combination with proper solid-state chemistry, can be maintained throughout carbonization. This Review comprehensively surveys the progress in polymer-derived functional HPCMs in terms of how to produce and control their porosities, heteroatom doping effects, and morphologies and their related use. First, we summarize and discuss synthetic approaches, including hard and soft templating methods as well as direct synthesis strategies employing polymers to control the pores and/or heteroatoms in HPCMs. Second, we summarize the heteroatom doping effects on the thermal stability, electronic and optical properties, and surface chemistry of HPCMs. Specifically, the heteroatom doping effect, which involves both single-type heteroatom doping and codoping of two or more types of heteroatoms into the carbon network, is discussed. Considering the significance of the morphologies of HPCMs in their application spectrum, potential choices of suitable polymeric precursors and strategies to precisely regulate the morphologies of HPCMs are presented. Finally, we provide our perspective on how to predefine the structures of HPCMs by using polymers to realize their potential applications in the current fields of energy generation/conversion and environmental remediation. We believe that these analyses and deductions are valuable for a systematic understanding of polymer-derived carbon materials and will serve as a source of inspiration for the design of future HPCMs.
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http://dx.doi.org/10.1021/acs.chemrev.0c00080DOI Listing
September 2020

Accelerating Crystallization of Open Organic Materials by Poly(ionic liquid)s.

Angew Chem Int Ed Engl 2020 Dec 4;59(49):22109-22116. Epub 2020 Oct 4.

School of Chemistry and Chemical Engineering, Beijing Institute of Technology, Beijing, P. R. China.

The capability to significantly shorten the synthetic period of a broad spectrum of open organic materials presents an enticing prospect for materials processing and applications. Herein we discovered 1,2,4-triazolium poly(ionic liquid)s (PILs) could serve as a universal additive to accelerate by at least one order of magnitude the growth rate of representative imine-linked crystalline open organics, including organic cages, covalent organic frameworks (COFs), and macrocycles. This phenomenon results from the active C5-protons in poly(1,2,4-triazolium)s that catalyze the formation of imine bonds, and the simultaneous salting-out effect (induced precipitation by decreasing solubility) that PILs exert on these crystallizing species.
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http://dx.doi.org/10.1002/anie.202008415DOI Listing
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC7756458PMC
December 2020

Enhancing crystal growth using polyelectrolyte solutions and shear flow.

Nature 2020 03 4;579(7797):73-79. Epub 2020 Mar 4.

Center for Soft and Living Matter, Institute for Basic Science, Ulsan, South Korea.

The ability to grow properly sized and good quality crystals is one of the cornerstones of single-crystal diffraction, is advantageous in many industrial-scale chemical processes, and is important for obtaining institutional approvals of new drugs for which high-quality crystallographic data are required. Typically, single crystals suitable for such processes and analyses are grown for hours to days during which any mechanical disturbances-believed to be detrimental to the process-are carefully avoided. In particular, stirring and shear flows are known to cause secondary nucleation, which decreases the final size of the crystals (though shear can also increase their quantity). Here we demonstrate that in the presence of polymers (preferably, polyionic liquids), crystals of various types grow in common solvents, at constant temperature, much bigger and much faster when stirred, rather than kept still. This conclusion is based on the study of approximately 20 diverse organic molecules, inorganic salts, metal-organic complexes, and even some proteins. On typical timescales of a few to tens of minutes, these molecules grow into regularly faceted crystals that are always larger (with longest linear dimension about 16 times larger) than those obtained in control experiments of the same duration but without stirring or without polymers. We attribute this enhancement to two synergistic effects. First, under shear, the polymers and their aggregates disentangle, compete for solvent molecules and thus effectively 'salt out' (that is, induce precipitation by decreasing solubility of) the crystallizing species. Second, the local shear rate is dependent on particle size, ultimately promoting the growth of larger crystals (but not via surface-energy effects as in classical Ostwald ripening). This closed-system, constant-temperature crystallization driven by shear could be a valuable addition to the repertoire of crystal growth techniques, enabling accelerated growth of crystals required by the materials and pharmaceutical industries.
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http://dx.doi.org/10.1038/s41586-020-2042-1DOI Listing
March 2020

Poly(ionic liquid) composites.

Chem Soc Rev 2020 Mar 25;49(6):1726-1755. Epub 2020 Feb 25.

School of Chemistry and Chemical Engineering, Beijing Institute of Technology, Beijing, P. R. China.

Poly(ionic liquid)s (PILs), as an innovative class of polyelectrolytes, are composed of polymeric backbones with IL species in each repeating unit. The combined merits of the polymers and ILs make them promising materials for composites in materials science. Particularly, the integration of PILs with functional substances (PIL composites) opens up a new dimension in utilizing ionic polymers by offering novel properties and improved functions, which impacts multiple subfields of our chemical society. This review summarizes recent developments of PIL composites with a special emphasis on the preparation techniques that are based on the intrinsic properties of the PILs and the synergistic effects between the PILs and substances of interest for diverse applications.
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http://dx.doi.org/10.1039/c8cs00938dDOI Listing
March 2020

Ionic organic cage-encapsulating phase-transferable metal clusters.

Chem Sci 2019 Feb 19;10(5):1450-1456. Epub 2018 Nov 19.

Department of Materials and Environmental Chemistry , Stockholm University , 10691 Stockholm , Sweden . Email:

Exploration of metal clusters (MCs) adaptive to both aqueous and oil phases without disturbing their size is promising for a broad scope of applications. The state-of-the-art approach ligand-binding may perturb MCs' size due to varied metal-ligand binding strength when shuttling between solvents of different polarity. Herein, we applied physical confinement of a series of small noble MCs (<1 nm) inside ionic organic cages (I-Cages), which by means of anion exchange enables reversible transfer of MCs between aqueous and hydrophobic solutions without varying their ultrasmall size. Moreover, the [email protected] hybrid serves as a recyclable, reaction-switchable catalyst featuring high activity in liquid-phase NHBH (AB) hydrolysis reaction with a turnover frequency (TOF) of 115 min.
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http://dx.doi.org/10.1039/c8sc04375bDOI Listing
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC6354838PMC
February 2019

Three birds, one stone - photo-/piezo-/chemochromism in one conjugated nanoporous ionic organic network.

J Mater Chem C Mater 2018 Sep 24;6(34):9065-9070. Epub 2018 May 24.

Max-Planck-Institute of Colloids and Interfaces , D-14476 Potsdam , Germany . Email:

A nanoporous material bearing a high ion density and inherent organic radical character was synthesized by a facile one-pot process, which exhibits photo-, piezo- and chemochromism, driven by the diverse electron transfer processes between the acceptor framework and different electron donors. The responsive behavior is useful for its sensing application, as demonstrated here for pressure, anion and gas sensing.
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http://dx.doi.org/10.1039/c8tc01324aDOI Listing
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC6333276PMC
September 2018

Porous polycarbene-bearing membrane actuator for ultrasensitive weak-acid detection and real-time chemical reaction monitoring.

Nat Commun 2018 04 30;9(1):1717. Epub 2018 Apr 30.

Department of Colloid Chemistry, Max Planck Institute of Colloids and Interfaces, Potsdam, D-14424, Germany.

Soft actuators with integration of ultrasensitivity and capability of simultaneous interaction with multiple stimuli through an entire event ask for a high level of structure complexity, adaptability, and/or multi-responsiveness, which is a great challenge. Here, we develop a porous polycarbene-bearing membrane actuator built up from ionic complexation between a poly(ionic liquid) and trimesic acid (TA). The actuator features two concurrent structure gradients, i.e., an electrostatic complexation (EC) degree and a density distribution of a carbene-NH adduct (CNA) along the membrane cross-section. The membrane actuator performs the highest sensitivity among the state-of-the-art soft proton actuators toward acetic acid at 10 mol L (M) level in aqueous media. Through competing actuation of the two gradients, it is capable of monitoring an entire process of proton-involved chemical reactions that comprise multiple stimuli and operational steps. The present achievement constitutes a significant step toward real-life application of soft actuators in chemical sensing and reaction technology.
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http://dx.doi.org/10.1038/s41467-018-03938-xDOI Listing
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC5928224PMC
April 2018

Flexible Viologen-Based Porous Framework Showing X-ray Induced Photochromism with Single-Crystal-to-Single-Crystal Transformation.

Angew Chem Int Ed Engl 2017 11 13;56(46):14458-14462. Epub 2017 Oct 13.

State Key Laboratory of Structural Chemistry, Fujian Institute of Research on the Structure of Matter, CAS, Fuzhou, Fujian, 350002, P. R. China.

A viologen-based Borromean entangled porous framework was found to be sensitive to both Cu and Mo X-ray sources, showing rapid photochromic response and recovery within one minute. The X-ray-induced photochromic process is accompanied by a reversible single-crystal-to-single-crystal (SC-SC) structural transformation, an unprecedented phenomenon for X-ray sensitive materials. The complex can be further processed into portable thin films for detecting the dose of the X-ray exposure. Moreover, the photochromism can occur over a broad temperature range of 100-333 K, both in the form of single crystals and thin films, making it a potential candidate for practical indoor and outdoor applications.
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http://dx.doi.org/10.1002/anie.201707290DOI Listing
November 2017

General Synthetic Route toward Highly Dispersed Metal Clusters Enabled by Poly(ionic liquid)s.

J Am Chem Soc 2017 07 21;139(26):8971-8976. Epub 2017 Jun 21.

Max Planck Institute of Colloids and Interfaces , Department of Colloid Chemistry, D-14424 Potsdam, Germany.

The ability to synthesize a broad spectrum of metal clusters (MCs) with their size controllable on a subnanometer scale presents an enticing prospect for exploring nanosize-dependent properties. Here we report an innovative design of a capping agent from a polytriazolium poly(ionic liquid) (PIL) in a vesicular form in solution that allows for crafting a variety of MCs including transition metals, noble metals, and their bimetallic alloy with precisely controlled sizes (∼1 nm) and record-high catalytic performance. The ultrastrong stabilization power is a result of an unusual synergy between the conventional binding sites in the heterocyclic cations in PIL and an in situ generated polycarbene structure induced simultaneously to the reduction reaction.
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http://dx.doi.org/10.1021/jacs.7b03357DOI Listing
July 2017

Nanoporous ionic organic networks: from synthesis to materials applications.

Chem Soc Rev 2016 11;45(23):6627-6656

Max Planck Institute of Colloids and Interfaces, Department of Colloid Chemistry, D-14424 Potsdam, Germany.

The past decade has witnessed rapid progress in the synthesis of nanoporous organic networks or polymer frameworks for various potential applications. Generally speaking, functionalization of porous networks to add extra properties and enhance materials performance could be achieved either during the pore formation (thus a concurrent approach) or by post-synthetic modification (a sequential approach). Nanoporous organic networks which include ion pairs bound in a covalent manner are of special importance and possess extreme application profiles. Within these nanoporous ionic organic networks (NIONs), here with a pore size in the range from sub-1 nm to 100 nm, we observe a synergistic coupling of the electrostatic interaction of charges, the nanoconfinement within pores and the addressable functional units in soft matter resulting in a wide variety of functions and applications, above all catalysis, energy storage and conversion, as well as environment-related operations. This review aims to highlight the recent progress in this area, and seeks to raise original perspectives that will stimulate future advancements at both the fundamental and applied level.
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http://dx.doi.org/10.1039/c6cs00597gDOI Listing
November 2016

Functional metal-bipyridinium frameworks: self-assembly and applications.

Dalton Trans 2015 Nov 19;44(44):19041-55. Epub 2015 Oct 19.

School of Chemistry, Beijing Institute of Technology, Beijing 100081, P. R. China.

Metal-organic frameworks (MOFs) as newly emerged materials have experienced rapid development in the last few years. The modular synthesis procedure allows integrating functional groups in their frameworks with varied applications. Due to the easy modification of the backbone and highly charged characteristics with interesting electron-active properties, the use of bipyridinium derivatives as synthons for the fabrication of functional metal-bipyridinium frameworks (MBPFs) has attracted increased interest over the past few years. Various bipyridinium-bearing ligands have been designed for the construction of functional MBPFs, and some of them present intriguing properties for potential applications including photochromism and photoswitching, sensing, molecule adsorption and separation. This perspective aims to highlight the recent progress in this area, and seeks to uncover promising ideas that will underscore future advancements at both the fundamental and applied levels.
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http://dx.doi.org/10.1039/c5dt03195hDOI Listing
November 2015

From a metal-organic framework to hierarchical high surface-area hollow octahedral carbon cages.

Chem Commun (Camb) 2015 Sep;51(73):13945-8

National Institute of Advanced Industrial Science and Technology (AIST), Ikeda, Osaka 563-8577, Japan.

For the first time, high surface-area hierarchical hollow octahedral carbon cages have been successfully fabricated by carbonization of a metal-organic framework, MIL-100(Al), followed by subsequent controlled acid etching, which exhibit significant CO2 and H2 adsorption capacities.
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http://dx.doi.org/10.1039/c5cc04230eDOI Listing
September 2015

Toward Homogenization of Heterogeneous Metal Nanoparticle Catalysts with Enhanced Catalytic Performance: Soluble Porous Organic Cage as a Stabilizer and Homogenizer.

J Am Chem Soc 2015 Jun 2;137(22):7063-6. Epub 2015 Jun 2.

National Institute of Advanced Industrial Science and Technology (AIST), Ikeda, Osaka 563-8577, Japan.

Organic molecular cage (CC3-R) with intrinsically porous skeleton is used as a support for immobilizing Rh nanoparticles (NPs) in an ultrasmall size of ∼1.1 nm for the first time. The CC3-R with the unique characteristic of high solubility can be utilized to homogenize the heterogeneous catalyst in solution. The obtained homogenized heterogeneous catalyst Rh/CC3-R-homo exhibits significantly enhanced catalytic performance toward various liquid-phase catalytic reactions, as compared with the heterogeneous counterpart Rh/CC3-R-hetero. Moreover, Rh/CC3-R-homo shows excellent durability and recyclability. The advantage of combining homogeneous and heterogeneous catalysts is likely to be beneficial for many applications.
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http://dx.doi.org/10.1021/jacs.5b04029DOI Listing
June 2015

Mechanical grinding of a single-crystalline metal-organic framework triggered emission with tunable violet-to-orange luminescence.

Chem Commun (Camb) 2014 Dec;50(100):15956-9

State Key Laboratory of Structural Chemistry, Fujian Institute of Research on the Structure of Matter, Chinese Academy of Sciences, Fuzhou, Fujian 350002, P. R. China.

A metal-organic framework (MOF) featuring intriguing Borromean entanglement exhibits a unique mechanochromic luminescence with on-off switching. The concomitant excitation wavelength-dependent emission behavior can be utilized to tune the emission color from violet to orange.
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http://dx.doi.org/10.1039/c4cc08316dDOI Listing
December 2014

From metal-organic framework to carbon: toward controlled hierarchical pore structures via a double-template approach.

Chem Commun (Camb) 2014 Nov;50(88):13502-5

National Institute of Advanced Industrial Science and Technology (AIST) Ikeda, Osaka 563-8577, Japan.

For the first time, MOF-derived hierarchically porous carbons with controlled pore structures for on-demand applications have been achieved via a double-template approach.
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http://dx.doi.org/10.1039/c4cc06212dDOI Listing
November 2014

Polycatenation-driven self-assembly of nanoporous frameworks based on a 1D ribbon of rings: regular structural evolution, interpenetration transformation, and photochemical modification.

Chemistry 2014 Feb 29;20(9):2488-95. Epub 2014 Jan 29.

State Key Laboratory of Structural Chemistry, Fujian Institute of Research on the Structure of Matter, CAS, Fuzhou, Fujian 350002 (P.R. China), Fax: (+86) 591-83710051.

A series of nanoporous frameworks constructed by a polycatenated isoreticular 1D ribbon of rings have been developed. The orientation of catenated ribbons can be fine tuned by varying counter anions, which allows both pore size and shape to be systematically adjusted in a pre-synthetic process. Distinct from conventional pore construction modes in which the organic linkers are alternately connected by metal nodes into a 3D periodic arrangement, the present polycatenation approach represents an alternative for constructing soft porous materials with tunable pore metrics and functions. Furthermore, these porous structures can interconvert into each other based on an anion-exchange process, accompanied by the transformation of the interpenetrating structures in different dimensional networks, which is unusual in porous frameworks. In addition, such a porous framework can be post-synthetically modified by a photoinduced [2+2] cycloaddition reaction, which not only achieves the surface modification (from conjugated to non-conjugated inner surface), but also triggers the structural transformation from low dimension to high dimension. Such a post-modification process reinforces the pore architecture through a covalent locking effect and has a great impact on the adsorption properties.
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http://dx.doi.org/10.1002/chem.201303700DOI Listing
February 2014

From assembled metal-organic framework nanoparticles to hierarchically porous carbon for electrochemical energy storage.

Chem Commun (Camb) 2014 Feb;50(13):1519-22

National Institute of Advanced Industrial Science and Technology (AIST), Ikeda, Osaka 563-8577, Japan.

Meso-/macropores have been induced as additional second-order structures by the assembly of particles of a microporous zeolitic imidazolate framework, ZIF-8, prepared by ultrasonication. Simple carbonization of ZIF-8 affords a 3-dimensional hierarchically porous carbon framework with micro-, meso- and macropores, which exhibits the best performance ever reported as a supercapacitor electrode.
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http://dx.doi.org/10.1039/c3cc48112cDOI Listing
February 2014

Photoinduced bending of a large single crystal of a 1,2-bis(4-pyridyl)ethylene-based pyridinium salt powered by a [2+2] cycloaddition.

Angew Chem Int Ed Engl 2013 Jun 21;52(26):6653-7. Epub 2013 May 21.

State Key Laboratory of Structural Chemistry, Fujian Institute of Research on the Structure of Matter, CAS Fuzhou, Fujian 350002, P.R. China.

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http://dx.doi.org/10.1002/anie.201301207DOI Listing
June 2013

A charge-polarized porous metal-organic framework for gas chromatographic separation of alcohols from water.

Chem Commun (Camb) 2013 Feb;49(16):1624-6

State Key Laboratory of Structural Chemistry, Fujian Institute of Research on the Structure of Matter, Chinese Academy of Sciences, Fuzhou 350002, Fujian, P. R. China.

A bipyridinium ligand with a charge separated skeleton has been introduced into a metal-organic framework to yield a porous material with charge-polarized pore space, which exhibits selective adsorption for polar guest molecules and can be further used in gas chromatography for the separation of alcohol-water mixtures.
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http://dx.doi.org/10.1039/c3cc38260eDOI Listing
February 2013

Charge-distribution-related regioisomerism of photoresponsive metal-organic polymeric chains.

Dalton Trans 2012 Nov;41(43):13441-6

State Key Laboratory of Structural Chemistry, Fujian Institute of Research on the Structure of Matter, Chinese Academy of Sciences, Fuzhou, Fujian 350002, PR China.

Ligand-originated isomers have been introduced into metal-organic materials to yield two complexes with almost the same coordination linkage and packing geometries but different charge-distributions, which exhibit distinct photoresponsive behaviors in the solid state.
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http://dx.doi.org/10.1039/c2dt31552aDOI Listing
November 2012

Reversible luminescence switching between single and dual emissions of bipyridinium-type organic crystals.

Chem Commun (Camb) 2012 Oct 17;48(84):10422-4. Epub 2012 Sep 17.

State Key Laboratory of Structural Chemistry, Fujian Institute of Research on the Structure of Matter, Chinese Academy of Sciences, Fuzhou, Fujian 350002, P. R. China.

An excitation-wavelength-dependent luminescence behavior of a bipyridinium derivative, together with its luminescence switching between single- and dual-emissions upon reversible solid state structural transformation, has been presented.
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http://dx.doi.org/10.1039/c2cc35685fDOI Listing
October 2012

Borromean-entanglement-driven assembly of porous molecular architectures with anion-modified pore space.

Chemistry 2012 Feb 20;18(7):1924-31. Epub 2012 Jan 20.

State Key Laboratory of Structural Chemistry, Fujian Institute of Research on the Structure of Matter, Chinese Academy of Sciences, Fuzhou, Fujian 350002, PR China.

A series of metal-organic frameworks based on a flexible, highly charged Bpybc ligand, namely 1⋅Mn⊃OH(-), 2⋅Mn⊃SO(4)(2-), 3⋅Mn⊃bdc(2-), 4⋅Eu⊃SO(4)(2-) (H(2)BpybcCl(2) = 1,1'-bis(4-carboxybenzyl)-4,4'-bipyridinium dichloride, H(2)bdc = 1,4-benzenedicarboxylic acid) have been obtained by a self-assembly process. Single-crystal X-ray-diffraction analysis revealed that all of these compounds contained the same n-fold 2D→3D Borromean-entangled topology with irregular butterfly-like pore channels that were parallel to the Borromean sheets. These structures were highly tolerant towards various metal ions (from divalent transition metals to trivalent lanthanide ions) and anion species (from small inorganic anions to bulky organic anions), which demonstrated the superstability of these Borromean linkages. This non-interpenetrated entanglement represents a new way of increasing the stability of the porous frameworks. The introduction of bipyridinium molecules into the porous frameworks led to the formation of cationic surface, which showed high affinities to methanol and water vapor. The distinct adsorption and desorption isotherms of methanol vapor in four complexes revealed that the accommodated anion species (of different size, shape, and location) provided a unique platform to tune the environment of the pore space. Measurements of the adsorption of various organic vapors onto framework 1⋅Mn⊃OH(-) further revealed that these pores have a high adsorption selectivity towards molecules with different sizes, polarities, or π-conjugated structures.
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http://dx.doi.org/10.1002/chem.201102938DOI Listing
February 2012

Reversible luminescence switch in a photochromic metal-organic framework.

Chem Commun (Camb) 2011 Jun 17;47(24):6870-2. Epub 2011 May 17.

State Key Laboratory of Structural Chemistry, Fujian Institute of Research on the Structure of Matter, Chinese Academy of Sciences, Fuzhou, Fujian 350002, PR China.

Eu(III) ions have been introduced into a photoactive viologen system to yield a polyrotaxane-like metal-organic framework, which exhibits reversible photochromism and luminescence modulation with a non-destructive readout capability in the solid state.
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http://dx.doi.org/10.1039/c1cc11550bDOI Listing
June 2011

Structural interconversion between a chain polymer and a two-dimensional network accompanied by tunable magnetic properties.

Chem Commun (Camb) 2011 Jun 12;47(23):6683-5. Epub 2011 May 12.

State Key Laboratory of Structural Chemistry, Fujian Institute of Research on the Structure of Matter, Chinese Academy of Sciences, Fuzhou, Fujian 350002, PR China.

The reaction of 2-hydroxypyrimidine-4,6-dicarboxylic acid (H(3)hpdc) with CuCl(2) under different temperatures gives a chain-like compound [Cu(2)(hpdc)(OH)(H(2)O)(4)]·H(2)O and a layer-like compound [Cu(2)(hpdc)(OH)(H(2)O)], which exhibit structural interconversion and tunable magnetic properties upon dehydration and hydration.
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http://dx.doi.org/10.1039/c0cc05763kDOI Listing
June 2011

Protonation-triggered conversion between single- and triple-stranded helices with a visible fluorescence change.

Angew Chem Int Ed Engl 2011 Feb 22;50(5):1149-53. Epub 2010 Dec 22.

State Key Laboratory of Structural Chemistry, Fujian Institute of Research on the Structure of Matter and Graduate School of the Chinese Academy of Sciences, Fuzhou, Fujian 350002, PR China.

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http://dx.doi.org/10.1002/anie.201005613DOI Listing
February 2011

2D flexible metal-organic frameworks with [Cd2(μ2-X)2](X = Cl or Br) units exhibiting selective fluorescence sensing for small molecules.

Chem Commun (Camb) 2011 Mar 12;47(9):2667-9. Epub 2011 Jan 12.

State Key Laboratory of Structural Chemistry, Fujian Institute of Research on the Structure of Matter and Graduate School of the Chinese Academy of Sciences, Fuzhou, Fujian, P R China.

Two isomorphous 2D flexible metal-organic frameworks with [Cd(2)(μ(2)-X)(2)] (X = Cl or Br) units and dynamic 1D channels, which show tunable or switchable fluorescence signals in response to the loss of guest water molecules, have been synthesized and characterized. Especially, the chloride-bridged complex is found to be a selective fluorescence sensor for MeCN.
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http://dx.doi.org/10.1039/c0cc04084cDOI Listing
March 2011

Metal-organogermanate frameworks built by two kinds of infinite Ge-O chains with high thermostability and luminescent properties.

Inorg Chem 2010 Nov 13;49(22):10211-3. Epub 2010 Oct 13.

State Key Laboratory of Structural Chemistry, Fujian Institute of Research on the Structure of Matter, Chinese Academy of Sciences, Fuzhou, Fujian 350002, China.

A bifunctional metalloligand with metal-C (Ge-C) bonds, bis(carboxyethylgermanium) sesquioxide (H(2)E(2)Ge(2)O(3), where E = -CH(2)CH(2)COO(-)), has been used to make metal-organometallic frameworks (MOMFs) Cd(1.5)(E(3)Ge(3)O(5)) (1) and Pb(E(2)Ge(2)O(3)) (2). In the structures, the inorganic Ge(2)O(3) cores of the metalloligands polymerize to form two kinds of infinite Ge-O chains, and the organic carboxyls induce the Cd and Pb ions to produce Cd-O and Pb-O chains. Further, the Ge-O chains link the Cd-O/Pb-O chains via -CH(2)CH(2)- groups to result in two novel MOMFs, showing high thermostability and blue-violet emission.
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http://dx.doi.org/10.1021/ic1012796DOI Listing
November 2010

Thermally triggered reversible transformation between parallel staggered stacking and plywood-like stacking of 1D coordination polymer chains.

Inorg Chem 2010 Aug;49(15):7046-51

State Key Laboratory of Structural Chemistry, Fujian Institute of Research on the Structure of Matter and Graduate School of the Chinese Academy of Sciences, Fuzhou, Fujian 350002 China.

An unusual example showing reversible interconversion of chain-like isomers under controlled experimental settings is reported, which illustrates the key role of assembly conditions for the target packing architecture with related properties. The reaction of Mn(II) ions with an organic ligand 2-hydroxypyrimidine-4,6-dicarboxylic acid (H(3)hpdc) at room temperature gives a coordination polymer {[Mn(3)(hpdc)(2)(H(2)O)(6)] x 2 H(2)O}(n) containing parallel staggered stacking, whereas the reaction under hydrothermal conditions at 150 degrees C affords a compound {[Mn(3)(hpdc)(2)(H(2)O)(6)] x H(2)O}(n) possessing plywood-like stacking. Interestingly, two compounds contain similar one-dimensional chain components with different orientations that can be controlled by thermodynamic factors. Thermally triggered reversible interconversion of the two compounds was verified by X-ray powder, IR, and element analysis. The spin-canted antiferromagnetic behaviors are observed in as-synthesized samples, and the influence of chain orientations on magnetic properties has been detected.
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http://dx.doi.org/10.1021/ic1008494DOI Listing
August 2010

Conformational and photosensitive adjustment of the 4,4'-bipyridinium in Mn(II) coordination complexes.

Chem Commun (Camb) 2010 Jul 3;46(26):4695-7. Epub 2010 Jun 3.

State Key Laboratory of Structural Chemistry, Fujian Institute of Research on the Structure of Matter and Graduate School of the Chinese Academy of Sciences, Fuzhou, Fujian 350002, P. R. China.

Two Mn(II) coordination complexes with considerable difference in photochromism and chirality have been constructed from the photoactive 1-(4-carboxybenzyl)-4,4'-bipyridinium ligand upon adjusting the reaction solvents.
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http://dx.doi.org/10.1039/c0cc00135jDOI Listing
July 2010