Two clusters-based coordination polymers constructed from conformation-flexible cyclohexanetetracarboxylate and chelating bipyridyl ligands

• Two coordination polymers based on hexanuclear Co6 and dinuclear Mn2 clusters
• Conformation selectivity was occurred in two complexes.
• Antiferromagnetic interactions were observed in two complexes.

Two new coordination polymers, [Co3(μ7-CTA)(bipy)(μ3-OH)2(μ2-H2O)]·3H2O (1) and [Mn2(μ6-CTA)(bipy)(H2O)2]·H2O (2), have been prepared by a flexible cyclohexane-1,2,4,5-tetracarboxylic acid (H4CTA) with a chelating co-ligand, 2,2’-bipyridine (bipy). Complex 1 is a two-dimensional (2D) structure based on unusual hexanuclear cluster (Co6) nodes and CTA linkers, while 2 exhibits a 1D chain based on dinuclear cluster (Mn2) units and CTA linkers. Structural analysis revealed that the conformation of H4CTA in 1 exhibits a (a,e,e,a) fashion and transforms to a thermodynamically more stable conformation (e,a,e,e) type in 2. 1 and 2 showed antiferromagnetic interactions.

Graphic AbstractTwo cluster-based low dimensional coordination polymers constructed from conformation-flexible cyclohexanetetracarboxylate and chelating bipyridyl ligand, displaying various conformations and antiferromagnetic properties.Figure optionsDownload as PowerPoint slide