Issue 6, 2016

Novel photo- and/or thermochromic MOFs derived from bipyridinium carboxylate ligands

Abstract

By utilizing the photo-active bipyridinium carboxylate ligand 1-(3,5-dicarboxyphenyl)-4,4′-bipyridinium bromide (H2ipbpBr) and varying the solvents, two new Zn-MOFs with photo- and/or thermochromic as well as photocontrolled luminescent properties have been successfully synthesized. [Zn(ipbp)(H2O)]·NO3·H2O (1) has a three-dimensional (3D) interpenetrated cationic framework, while [Zn(ipbp)(H2O)2]·NO3·H2O (2) possesses a 2D layered cationic network. Interestingly, 2 and its dehydrated phase 2′ can undergo reversible structure transformation upon removal and uptake of guest and coordinated water molecules. 1 and 2 are photo-active to UV and visible light, and undergo an obvious color transformation from light yellow to green as a result of the formation of ipbp radicals. Compared with 2, 1 is more photosensitive due to its close donor–acceptor interaction and dense arrangement of interpenetrated frameworks. Meanwhile, 1 is thermochromic with a lower thermal-response temperature (90 °C). These two compounds also exhibit tuneable luminescence in response to light. This work provides a facile method to synthesize novel chromic MOFs using the photosensitive organic linkers and the conformational adjustment.

Graphical abstract: Novel photo- and/or thermochromic MOFs derived from bipyridinium carboxylate ligands

Supplementary files

Article information

Article type
Research Article
Submitted
16 Jan 2016
Accepted
02 Mar 2016
First published
03 Mar 2016

Inorg. Chem. Front., 2016,3, 814-820

Novel photo- and/or thermochromic MOFs derived from bipyridinium carboxylate ligands

C. Zhang, L. Sun, C. Zhang, S. Wan, Z. Liang and J. Li, Inorg. Chem. Front., 2016, 3, 814 DOI: 10.1039/C6QI00013D

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