The effect of different substituent groups of auxiliary ligands on the photochromic behaviors of bipyridinium-based coordination polymers

Abstract

Two bipyridinium-based coordination polymers, {[Cd(BCbpy)2(o-BDC)]·13H2O} (1) and {[Cd(BCbpy)2(SA)]·6H2O} (2), have been synthesized and structurally characterized. Single-crystal X-ray diffraction analysis shows that the two compounds have similar one-dimensional coordination polymeric chain structures but different packing patterns. Compound 1 displays fast eye-detectable photochromic behavior while compound 2 is photoinert under 365nm irradiation. The influence of different substituent groups in same site of auxiliary ligands on the photochromic behaviors of the two compounds has been studied in detail.