Photochromism and decolorization controlled by auxiliary ligands of complexes derived from 1 ‐methyl‐4,4′‐bipyridinium cation

The influence of auxiliary ligands onthe molecular configuration and packing pattern has been explored, which plays a crucial role in determiningthe photochromism and decolourization process. Three 1 ‐methyl‐4,4′‐bipyridinium (MQ+) ‐based complexes, {[Cd(MQ)(p‐BDC)Br]⋅H2O}n (1), {[Cd(MQ)(m‐BDC)(H2O)Br] ⋅3H2O}n (2) and Cu(MQ)Br2 (3) (p‐H2BDC  = 1,4‐benzenedicarboxylic acid,m‐H2BDC  = 1,3‐benzenedicarboxylic acid), have been synthesized and structurally characterized. Compounds1 and2 are one ‐dimensional coordination polymers constituted of one coordinated MQ+ cation, one coordinated Br− ion and chains of Cd2+ ions connected by deprotonated BDC2 − units, which both have photochromism but different decolorization behaviors. The structures and photoresponsive behaviors controlled by auxiliary ligands have been explored. Compound3 is constituted of one Cu+ center, one MQ+ ligand and two coordinated Br− ions in a ‘V’ configuration, exhibiting no photochromism.

Source: Applied Organometallic Chemistry - October 29, 2018 Category: Chemistry Authors: Jin ‐jian Liu Tags: FULL PAPER Source Type: research