Abstract: | The octahedral cis and trans isomers of dichlorobis(2‐picolylamine)iron(II), FeCl2(C6H8N2)2], co‐crystallize in a 1:1 ratio. The cis isomer lies on a twofold axis, whereas the trans isomer lies on an inversion centre. The structure is fully ordered, with both Fe atoms in a pure high‐spin state. The Fe, Cl and N(H2) atoms of both isomers lie in the same plane, allowing all Cl and amine H atoms to be engaged in extensive two‐dimensional hydrogen bonding. The hydrogen‐bonded layers are interconnected through π–π interactions between the pyridine rings. Searches in the Cambridge Structural Database uncover very few examples of such isomer co‐existence. |