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

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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

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Publication details

The article was received on 14 Nov 2018, accepted on 27 Jan 2019 and first published on 29 Jan 2019


Article type: Paper
DOI: 10.1039/C8CE01948G
Citation: CrystEngComm, 2019, Advance Article

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    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, Advance Article , DOI: 10.1039/C8CE01948G

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