Understanding the photochromic mechanism of MOCs, regulating and controlling their structure and related photochromic properties is one of the focuses of chemistry and materials science. In this paper, two isoreticular metal-organic complexes have been synthesized by reaction of Zinc nitrite and H(6)ttha in the presence of bpee or bpea as co-ligand, respectively. The photochromic properties of complex 1 and 2 have been investigated. Even though both complexes holding similar framework, it is intriguing that complex 1 with conjugated co-ligand bpee displays remarkable photochromism property, bu...
