Reversible color changes of metal(ii)-N1,N3-di(pyridin-4-yl)isophthalamide complexes via desolvation and solvation

Abstract

Four metal(II)-N¹,N³-di(pyridin-4-yl)isophthalamide (L) complexes formulated as [Cu(L)₂Cl₂]·5.5H₂O (1), [Ni(L)₂Cl₂]·5.5H₂O (2), [Co(L)(m-BDC)]·DMF (3) (m-BDC = 1, 3-benzenedicarboxylic dianion) and [Cd₂(L)₂(m-BDC)₂]·DMF·0.2H₂O (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.