Isopropyl N-[1'-(methoxy-carbon-yl)ferro-cen-yl]carbamate-ethyl N-[1'-(methoxy-carbon-yl)ferrocen-yl]carbamate (0.6/0.4).

Herein we report the crystal structure and synthesis of two cocrystallized complexes, [Fe(C(7)H(7)O(2))(C(9)H(12)NO(2))](0.6)[Fe(C(7)H(7)O(2))(C(8)H(10)NO(2))](0.4). The molecules crystallize as layers in the bc plane with van der Waals interactions allowing the alkyl chains to interact and the ferrocene units to form a herringbone pattern up the c axis. Every second layer is linked via N-H⋯O hydrogen bonding.The two complexes were modelled as disordered in a ratio of 0.60:0.40.