Three topological isomeric coordination polymer networks from the assembly of a rigid linear spacer and a square planar metal node: structures, isomerism control, and solid-to-solid transformation.

Assemblies of 1-methyl-1',2-bis(4-pyridyl)ethene (mpe) and Co(NCS)(2) afford three isomeric framework networks and different topological features depending on the assembly conditions. Isomerism control and solid-to-solid transformation phenomena are observed among them.