Sun, UV and X-ray triple photochromic properties of three coordination polymers based on 1, 1′-bis(3-carboxylatobenzyl)-4, 4′-bipyridinium ligand. Issue 12 (5th March 2020)

• Record Type: Journal Article
• Authors: Liu, Jinjian; Lu, Yiwei; Lu, Wenbo
• Is Part Of: CrystEngComm. Volume 22:Issue 12(2020)
• Page Start: 2121
• Page End: 2127
• Publication Date: 2020-03-05
• Subjects: Crystals -- Periodicals; Crystal growth -- Periodicals; Crystallography -- Periodicals; Cristaux -- Périodiques; Cristaux -- Croissance -- Périodiques; Cristallographie -- Périodiques; 548
• DOI: 10.1039/d0ce00206b
• Languages: English
• ISSNs: 1466-8033

Abstract

Abstract : Reversible color changes for three compounds can be observed in the air upon sunlight, UV-light and X-ray irradiation. Abstract : Based on a bipyridinium carboxylate ligand 1, 1′-bis(3-carboxylatobenzyl)-(4, 4′-bipyridinium)-dichloride (H2 bcbpyCl2 ), three new coordination polymers {[Co0.5 (bcbpy)0.5 (H2 O)2 ]( p -BDC)0.5 ·H2 O} n (1 ) {[Ni(bcbpy)(H2 O)4 ]( p -BDC)·2H2 O} n (2 ) and [Zn2 (bcbpy)(BTEC)(H2 O)2 ·6H2 O] n (3 ) are designed and synthesized by varying the benzenecarboxylic acids (1, 4-benzenedicarboxylic acid = p -H2 BDC, 1, 2, 4, 5-benzenetetracarboxylic acid = H4 BTEC) to adjust the coordination mode between the viologen ligand and metal ions. Single crystal structure analyses reveal that compounds 1 and 2 both exhibit one-dimensional (1D) chain-like structure, while compound 3 exhibits two-dimensional (2D) layered architecture. Furthermore, due to the formation of viologen radicals, reversible color changes for three compounds can be observed in the air upon sunlight, UV-light and X-ray irradiation. Particularly, compound 3 has high photosensitivity, giving an eye-detectable color change after exposure to sunlight in air within 1 min. In addition, the photoproducts for the three compounds exhibit an ultralonglived charge-separated state.