Conformational flexibility of 2,6-bis(pyrazol-1-ylmethyl)pyridine (L5) in [(L5)CoII(H2O)3]Cl2 and [(L5)NiII(H2O)2Cl]Cl·H2O. Molecular structures and non-covalent interactions

► 2,6-Bis(pyrazol-1-ylmethyl)pyridine, a nonplanar ligand. ► Differential facial/meridional coordination ability towards Co(II) and Ni(II) ions. ► Six-coordination by the ligand and chloride/water. ► Existence of extensive non-covalent interactions.