Publications by authors named "Wubin Wu"

2 Publications

  • Page 1 of 1

Lanthanide MOFs for inducing molecular chirality of achiral stilbazolium with strong circularly polarized luminescence and efficient energy transfer for color tuning.

Chem Sci 2020 Aug 4;11(34):9154-9161. Epub 2020 Aug 4.

Beijing National Laboratory for Molecular Sciences, CAS Key Laboratory of Photochemistry, Institute of Chemistry, Chinese Academy of Sciences Beijing 100190 China

We present herein an innovative host-guest method to achieve induced molecular chirality from an achiral stilbazolium dye (DSM). The host-guest system is exquisitely designed by encapsulating the dye molecule in the molecule-sized chiral channel of homochiral lanthanide metal-organic frameworks (-(+)/-(-)-TbBTC), in which the - or -configuration of the dye is unidirectionally generated a spatial confinement effect of the MOF and solidified by the dangling water molecules in the channel. Induced chirality of DSM is characterized by solid-state circularly polarized luminescence (CPL) and micro-area polarized emission of [email protected], both excited with 514 nm light. A luminescence dissymmetry factor of 10 is obtained and the photoluminescence quantum yield (PLQY) of the encapsulated DSM in [email protected] is ∼10%, which is close to the PLQY value of DSM in dilute dichloromethane. Color-tuning from green to red is achieved, owing to efficient energy transfer (up to 56%) from Ln to the dye. Therefore, this study for the first time exhibits an elegant host-guest system that shows induced strong CPL emission and enables efficient energy transfer from the host chiral Ln-MOF to the achiral guest DSM with the emission color tuned from green to red.
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http://dx.doi.org/10.1039/d0sc02856hDOI Listing
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC8163402PMC
August 2020

Magnetically modulated photochemical reaction pathways in anthraquinone molecules and aggregates.

iScience 2021 May 21;24(5):102458. Epub 2021 Apr 21.

Key Laboratory of Photochemistry, Beijing National Laboratory for Molecular Sciences, Institute of Chemistry, Chinese Academy of Sciences, Beijing 100190, China.

The chemical reactions involving excited-state radical pairs (RPs) of parallel/anti-parallel spin configurations are sensitive to magnetic field, leading to the possibilities of magnetically controlled synthesis of chemical compounds. Here we show that the reaction of anthraquinone (AQ) in sodium dodecyl sulfate (SDS) micellar solution under UV excitation is significantly influenced by applying external field. The steady state and time-resolved spectroscopies reveal that the reaction intermediate (pairs of AQH-SDS radicals) can undergo two distinct pathways depending on whether it is spin singlet or triplet, and the field is beneficial to the conversion between spin configurations of RPs. The applied field not only affects the reaction rate constant but also changes the final products. Besides, the aggregation of AQ molecules would change the population of singlets and triplets and thus enhance magnetic field effect. This work represents a promising way of controlling chemical reaction and improving reaction selectivity magnetic field methods.
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http://dx.doi.org/10.1016/j.isci.2021.102458DOI Listing
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC8169793PMC
May 2021
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