Publications by authors named "Douglas J Breen"

2 Publications

  • Page 1 of 1

A Future Perspective on Phototriggered Isomerizations of Transition Metal Sulfoxides and Related Complexes.

J Am Chem Soc 2021 01 5;143(2):526-537. Epub 2021 Jan 5.

Department of Chemistry and Chemical Biology, 300 Terrace Street NE, University of New Mexico, Albuquerque, New Mexico 87131-001 United States.

Photochromic molecules are examples of light-activated bistable molecules. We highlight the design criteria for a class of ruthenium and osmium sulfoxide complexes that undergo phototriggered isomerization of the bound sulfoxide. The mode of action in these complexes is an excited-state isomerization of the sulfoxide from S-bonded to O-bonded. We discuss the basic mechanism for this transformation and highlight specific examples that demonstrate the effectiveness and efficiency of the isomerization. We subsequently discuss future research directions within the field of phototriggered sulfoxide isomerizations on transition metal polypyridine complexes. These efforts involve new synthetic directions, including the choice of metal as well as new ambidentate ligands for isomerization.
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http://dx.doi.org/10.1021/jacs.0c08820DOI Listing
January 2021

Controlling Photoisomerization Reactivity Through Single Functional Group Substitutions in Ruthenium Phosphine Sulfoxide Complexes.

J Am Chem Soc 2018 08 30;140(31):9819-9822. Epub 2018 Jul 30.

Department of Chemistry and Chemical Biology , 1 University of New Mexico , Albuquerque , New Mexico 87131 , United States.

We report the crystallography, emission spectra, femtosecond pump-probe spectroscopy, and density functional theory computations for a series of ruthenium complexes that comprise a new class of chelating triphenylphosphine based ligands with an appended sulfoxide moiety. These ligands differ only in the presence of the para-substitutent (e.g., H, OCH, CF). The results show a dramatic range in photoisomerization reactivity that is ascribed to differences in the electron density of the phosphine ligand donated to the ruthenium and the nature of the excited state.
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http://dx.doi.org/10.1021/jacs.8b05957DOI Listing
August 2018