Multinuclear coordination polymers constructed from V-shaped multicarboxylate and bis(imidazol-1-ylmethyl)-benzene ligand: Syntheses, crystal structures, and luminescent properties

Five new coordination polymers [Cu(OBA)(1,2-bix)]n·nH2O (1), [Cu(1,4-bix) (O-OBA)]n (2), [Cd3(1,2-mbix)2(O-OBA)3]n·3nH2O (3), [Cu(1,2-bix) (H2ODPT)]n·2nH2O (4), [Cd4(ODPT)2(1,3-bix)2]n·2nH2O (5) (H2OBA = 4,4′-oxybis(benzoic acid), O-H2OBA = 2,2′-oxybis(benzoic acid), H4ODPT = 4,4′-oxidiphtalic acid, 1, n-bix = 1,n-bis(imidazol-l-ylmethyl)benzene (n = 2,3,4), 1,2-mbix = 1,2-bis(2-methyl-imidazol-l-ylmethyl)benzene, have been synthesized. Their structures have been determined by single crystal X-ray diffraction analyses and further characterized by IR spectroscopy, thermogravimetric analysis (TGA). Compound 1 is a 2D (4,4) topological structure, Complex 2 exhibits a double-chain structure. The 3D network structure of 3 is a five-connected BN topological framework with the Schläfli symbol of 46·64. Compound 4 is a three-connected hcb topological layer with the Schläfli symbol of 63. The network topology of the 3-D framework in 5 can be simplified by considering the Cd4 cluster to be 8-connected nodes, (ODPT)4− ligands as 3-connected nodes, and 1,3-bix ligands as linkers. As a result, a previously unknown framework topology with the total Schläfli symbol of 3·44·52·69·7·84 and the long vertex symbol of 3·4·4·4·4·62·62·62·62·62·62·62·62·8·8 is formed. The photoluminescent properties of 3 and 5 were investigated.