Construction of metal–organic replica of sqc1121 network based on a multifunctional ligand via solvothermal in situ disulfide cleavage reaction

A novel coordination polymer [H2N(CH3)2]2[Cd2(L)2(SO4)]∙DMF (1) (L = 6-mercapto-3-pyridinecarboxylate) has been prepared by the solvothermal reaction of CdSO4 and 6,6′-dithiodinicotinic acid in DMF, in which 6,6′-dithiodinicotinic acid was in situ reduced to L. Single crystal X-ray diffraction reveals that 1 displays a 3D porous framework with [H2N(CH3)2]+ cations derived from the hydrolyzed DMF molecules. Further topological analysis reveals an unusual (3,4)-connected (4.82)2(42.82.102)(8.102) net of 1, which is the first metal–organic replica of sqc1121 network.