Photocoloration in Hybrid Amino Acid Polyoxometalates

Fateme Akhlaghi Bagherjeri, Chris Ritchie, Robert W. Gable, Colette Boskovic

Research output: Contribution to journalArticleResearchpeer-review

3 Citations (Scopus)

Abstract

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 [As4{W3Y}W44Y4O159(Gly)8(H2O)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.

Original languageEnglish
Pages (from-to)461-468
Number of pages8
JournalEuropean Journal of Inorganic Chemistry
Volume2019
Issue number3-4
DOIs
Publication statusPublished - 31 Jan 2019
Externally publishedYes

Keywords

  • Glycine ligands
  • Organic–inorganic hybrids
  • Photochromism
  • Photoredox
  • Polyoxometalates

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