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Photocoloration in Hybrid Amino Acid Polyoxometalates
Author(s) -
Akhlaghi Bagherjeri Fateme,
Ritchie Chris,
Gable Robert W.,
Boskovic Colette
Publication year - 2019
Publication title -
european journal of inorganic chemistry
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.667
H-Index - 136
eISSN - 1099-0682
pISSN - 1434-1948
DOI - 10.1002/ejic.201800598
Subject(s) - chemistry , polyoxometalate , intramolecular force , glycine , hydrogen bond , ligand (biochemistry) , ammonium , photochemistry , medicinal chemistry , polymer chemistry , stereochemistry , inorganic chemistry , amino acid , molecule , catalysis , organic chemistry , receptor , biochemistry
The study of four different salts of a hybrid glycine–polyoxotungstate has revealed photocoloration that is dependent on the intramolecular hydrogen bonding between glycine ligand ammonium groups and the polyoxotungstate. Four compounds comprised of the hybrid polyoxometalate [As 4 {W 3 Y}W 44 Y 4 O 159 (Gly) 8 (H 2 O) 12 ] 9– (Gly = glycine) with glycinium, benzylammonium, 4‐methylbenzylammonium, or benzyltriethylammonium countercations have been synthesized and structurally characterized. In the solid state, two of the compounds exhibit coloration associated with photoreduction, cycling from white to blue under UV irradiation, and bleaching back to white following reoxidation in air. The ability of the hybrid POM to undergo photoreduction correlates with the orientation of the zwitterionic ammonium groups of the glycine ligands and the intramolecular hydrogen bonding to POM oxo ligands. The kinetics of coloration of these POMs follows a pseudo‐second‐order rate law.