To study the effect of metal ions on the photochromic behaviors of CPs, three new isostructural coordination polymers (CPs) based on a neutral viologen moiety, 1,1'-bis(3-carboxylatobenzyl)-4,4'-bipyridinium (bcbpy), have been obtained… Click to show full abstract
To study the effect of metal ions on the photochromic behaviors of CPs, three new isostructural coordination polymers (CPs) based on a neutral viologen moiety, 1,1'-bis(3-carboxylatobenzyl)-4,4'-bipyridinium (bcbpy), have been obtained by choosing 1,2,4,5-benzenetetracarboxylic acid (H4BTEC) to coordinate with different metal ions, {[M(H2O)6][M(BTEC)(H2O)4]·(bcbpy)·4H2O}n (M = Co (1), Ni (2), Zn (3)), all of which exhibit metal-dependent photochromism and adjustable photosensitivity. Compounds 1 and 2 are only sensitive to UV light, while compound 3 is sensitive to sunlight, UV light and X-ray (Mo). The comparison of the photochromic behaviors of the three CPs indicates that the metal ions play an important role in regulating their photochromic properties.
               
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