Reversible color changes of metal(ii)-N~1,N~3- di(pyridin-4-yl)isophthalamide complexes via desolvation and solvation

摘要

Four metal(ii)-N~1,N~3-di(pyridin-4-yl)isophthalamide (L) complexes formulated as [Cu(L)_2Cl_2]·5.5H _2O (1), [Ni(L)_2Cl_2]·5.5H_2O (2), [Co(L)(m-BDC)]·DMF (3) (m-BDC = 1, 3-benzenedicarboxylic dianion) and [Cd_2(L)_2(m-BDC)_2]·DMF·0. 2H_2O (4) have been solvothermally synthesized and structurally characterized by single-crystal X-ray diffractions. Complexes 1 and 2 are isomorphous, both of them exhibit chain-like frameworks, in which ligand L shows a cis-conformation. Complex 3 displays a three dimensional architecture constructed by ligand L with intermediate-conformation linking different chains. Complex 4 shows a corrugated two dimensional layer in which ligand L with trans-conformation and m-BDC act as bridging groups linking different Cd(ii) centers. The four complexes all possess stable host frameworks, and complexes 1-3 show reversible color changes via desolvation and solvation.