Issue 24, 2012

Solvent- and anion-controlled photochromism of viologen-based metal–organic hybrid materials

Abstract

Research on the tunable photosensitive properties of soft metal organic hybrid materials via environmental stimulation is presented. A supramolecular coordination polymer accommodating guest water molecules and anions is synthesized in aqueous solution. The original photochemically inert framework exhibits thermochromism, and can be transferred into a photochromic state via dehydration treatment. Furthermore, the interlayer ClO4 ions can be exchanged by halide and pseudohalide anions in a crystal to crystal manner. Although the favorable geometry for electron transfer from the carboxylate group to the bipyridinium moiety is created in transformed structures, the introduction of halide or pseudohalide anions leads to the formation of different charge transfer interactions with electron-accepting bipyridinium units in the ground state, which improves the light absorption of the compounds in the visible region and greatly affects the photoreduction efficiency of the bipyridinium unit. Consequently, the transformed crystals exhibit multicolor photochromic properties in solid states.

Graphical abstract: Solvent- and anion-controlled photochromism of viologen-based metal–organic hybrid materials

Supplementary files

Article information

Article type
Paper
Submitted
30 Jan 2012
Accepted
24 Apr 2012
First published
25 Apr 2012

J. Mater. Chem., 2012,22, 12212-12219

Solvent- and anion-controlled photochromism of viologen-based metal–organic hybrid materials

J. Sun, P. Wang, Q. Yao, Y. Chen, Z. Li, Y. Zhang, L. Wu and J. Zhang, J. Mater. Chem., 2012, 22, 12212 DOI: 10.1039/C2JM30558E

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