A three-dimensional (3D) chiral mixed metal–organic framework [Cd 4 Cl (Ni–L) 3 (Ni–HL)(H 2 O) 6 (DMF)]· 4DMF (CMOF 1) based on a new enantiopure dicarboxyl-functionalized Ni (saldpen) metalloligand Ni–H 2 L and a novel tetranuclear cadmium cluster [Cd 4 Cl (CO 2) 7 (CO 2 H)] has been synthesized and characterized by elemental analyses, IR and UV-vis spectra, thermogravimetric analysis, nitrogen and carbon dioxide adsorption, powder and ...