Synthesis, Crystal Structure, and Luminescence of Zn/Cd Coordination Polymers with a New Fuctionalized Terpyridyl Carboxylate Ligand

Abstract

Eight new coordination polymers, [Zn(L)Cl]n (1), [Zn2(L)4]n·2nH2O (2), [Zn2(L)2(1,3-bdc)]n (3), [Zn2(L)(1,3-bdc)(OH)]n·0.5nH2O (4), [Zn9(L)4(1,3-bdc)6(OH)2]n·3nH2O (5), [Zn2(L)2(1,4-bdc)]n·nH2O (6), [Cd2(L)4]n·nH2O (7), and [Cd3(L)2(1,3-bdc)2]n·nH2O (8) [HL = 4′-(2-carboxyphenyl)-4,2′:6′,4″-terpyridine, H2(1,3-bdc) = benzene-1,3-dicarboxylic acid, H2(1,4-bdc) = benzene-1,4-dicarboxylic acid] have been synthesized under hydrothermal conditions and characterized by elemental analysis, IR, and single crystal X-ray diffraction. Complexes 1, 2, and 7 display a two-dimensional (2D) layer structure. Complex 3 presents a complicated 2D layer structure with paddle-wheel units, which exhibits an interesting (3,4,6)-connected 3-nodal new topological net with the point symbol of (3·4·5·62·7)2(3·6·7)2(32·42·52·62·76·8). Complex 4 is a 2-nodal (3,5)-connected 2D bilayer structure with the gek1 topological net and the point symbol of (3·4·5)(32·4·5·62·74). Complex 5 shows a self-penetrating three-dimensional (3D) framew...