Effect of bis-triazole based secondary ligands on the structure of coordination polymers generated from terephthalic acid

Reactions of Zn/Cd(ClO4)2·6H2O and terephthalic acid (H2BDC) with three bis-triazole ligands afforded three coordination polymers under solvothermal conditions, {[Zn(BDC)(L1)]·H2BDC}n (1), {[Zn(BDC)(L2)0.5]·H2O}n (2), and {[Cd2(BDC)2(L3)(DMF)(H2O)2]·2H2O]}n (3) (L1 = bis(4-(4H-1,2,4-triazol-4-yl)phenyl)methane, L2 = bis(4-(4H-1,2,4-triazol-4-yl)phenyl)ethane, and L3 = 1,4-bis(4H-1,2,4-triazol-4-yl)benzene). Solid 1 displayed a 2-D structure which contained two kinds of rings. Both 2 and 3 were 3-D threefold interpenetrating frameworks. Solid 2 showed a α–Po-related net, while 3 exhibited an acs-related network with a binuclear node. Furthermore, the photoluminescent properties of 1–3 were investigated.