Second-ligand-dependent multi-fold interpenetrated architectures of two 3-D metal(II)–organic coordination polymers

By one-pot solvothermal reaction, two 3-D metal(II)–organic coordination polymers [Zn2(SDC)2(L1)] (1) and [Zn(SDC)(L2) · 2DMF] (2) are self-assembled from trans-4,4′-stilbenedicarboxylic acid (H2SDC), 4-(4-((E)-2-(pyridin-4-yl)vinyl)- styryl)pyridine (L1), 4,4′-bipyridine(L2) and zinc salts in the presence of N,N′-dimethylbenzenamine, and characterized by single-crystal X-ray diffraction analyses. The overall structure of 1 with total potential solvent-accessible volume of 44.2% presents a fourfold interpenetrated topology from 6-connected CdO-like nets, while that of 2 with nanosized channels occupied by free DMF molecules displays a fivefold interpenetrated framework of [Zn(SDC)(L2)]n from 4-connected diamondoid networks. The topology types and the multi-fold interpenetrating of 1 and 2 are dependent on the second ligands (L1 and L2). Solid-state 1 and 2 have expected photoluminescence with maximum emission at 484 and 505 nm, respectively.