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.