Issue 10, 2019

Two novel multichromic coordination polymers based on a new flexible viologen ligand exhibiting photocontrolled luminescence properties and sensitive detection for ammonia

Abstract

A new flexible bipyridinium ligand, 1,1′-bis-((3-carboxylatobenzyl)-4,4′-bipyridinium) dichloride (H2bcbpy·2Cl), was synthesized and successfully introduced into two novel cadmium-based coordination polymers (CPs) by analogous solvothermal reactions. Because of the presence of electron-deficient bipyridinium moieties, compounds 1 and 2 can both easily undergo photo- and thermal-induced electron transfer and exhibit eye-detectable photochromic and thermochromic behaviors. Moreover, their luminescence properties can be switched by UV-vis light irradiation or by heating to 90 °C. Interestingly, 1 and 2 have a sensitive response for ammonia. The yellow compounds 1 and 2 turn blue and green, respectively, when exposed to ammonia vapor. For most CPs-based bipyridinium derivatives, their crystal structures are usually damaged when exposed to ammonia vapor. Surprisingly, compound 2 displays a fast discolored–decolored response to ammonia within dozens of seconds and maintains an unchanged crystal structure.

Graphical abstract: Two novel multichromic coordination polymers based on a new flexible viologen ligand exhibiting photocontrolled luminescence properties and sensitive detection for ammonia

Supplementary files

Article information

Article type
Paper
Submitted
14 noy 2018
Accepted
27 yan 2019
First published
29 yan 2019

CrystEngComm, 2019,21, 1635-1641

Two novel multichromic coordination polymers based on a new flexible viologen ligand exhibiting photocontrolled luminescence properties and sensitive detection for ammonia

H. Y. Wang, S. Liu, C. Fu and H. Zhang, CrystEngComm, 2019, 21, 1635 DOI: 10.1039/C8CE01948G

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