Control over the preparation of two pH-dependent Cu(II) supramolecular isomers based on 1,3,5-benzenetricarboxylic acid and the bis(4-pyridylthio)methane ligand

The possibility of controlling the formation of copper(II) coordination polymers based on the rigid carboxylate ligand 1,3,5-benzenetricarboxylic acid (H(3)btc) and an N,N-divergent spacer with conformational flexibility, bis(4-pyridylthio)methane (SCS), was investigated. The new coordination polymers (1)(infinity)[Cu(H(2)btc)(2)(SCS)] (1) and (2)(infinity)[Cu(Hbtc)(SCS)(2)]center dot H2O (2) have been prepared and characterized. Compounds 1 and 2 were obtained as a mixture and optimization of the synthetic conditions allowed the isolation of pure phases in high yield. Topological analysis showed the interpenetration of three networks with a vcm-type topology in 2. The thermal stability and the structural dynamics of these systems have also been investigated.