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Two new homometallic coordination polymers 1 and 2 have been prepared by the directly one-step hydrothermal reactions of a carboxylate-functionalized salen ligand with Zn(II) and Co(II) ions, respectively. 1 exhibits a 3D open framework built by [Zn 4 (μ 4 -O)(carboxylate) 8 ] units and double Zn-salen ligands, while 2 shows a 1D chain structure constructed by cobalt ions and the ligand derived from the hydrolysis to one C N bond of salen ligand. The preliminary fluorescence measurements of 1 – 2 show the influence of structure on the property. [ABSTRACT FROM AUTHOR]

Abstract: Two new metal–organic frameworks based on cyclic-type dodecanuclear copper units, (Me4N)6[Cu12(OMe)6(pz)6(BTC)6]·18H2O 1 and (Me4N)6[Cu12(OH)6(pz)6(BTC)6]·21H2O 2 (pz=pyrazolate, BTC=1,3,5-benzenetricarboxylate), have been prepared by the solvothermal reactions of copper salts, Hpz and H3BTC ligands. The cyclic-type Cu12 unit in 1 and 2 is constructed by twelve CuII ions linked together by μ2-OH or μ2-OMe and unidentate carboxylate groups at the inner- and μ-pz and bidentate carboxylate groups at the outer surface of the toroid. In 1 and 2, each Cu12 unit is connected to 12 other units by BTC linkers, leading to 12-connected three-dimensional porous frameworks. The photocatalytic investigations indicate that compounds 1 and 2 exhibit photocatalytic activity for the degradation of RhB. [Copyright &y& Elsevier]

Abstract: Three novel Zn(II) complexes based on tetrazole-1-acetic ligand, Zn(1-tza)2(phen) (1), [Zn(1-tza)(2,2′-bipy)(H2O)]∙X (X=NO3 − 2, ClO4 − 3) (1-tza=tetrazole 1-acetic, phen=1,10-phenanthroline, 2,2′-bipy=2,2′-bipyridine), were synthesized and structurally characterized by single-crystal X-ray diffraction. Three different coordination modes of 1-tza ligand exist in the three obtained complexes. The 1-D chain of 1 is built by μ 2-1-tza bridges. Compounds 2 and 3 are isomorphous, and their structures show a 2-D (4,4)-connected net constructed from binuclear [Zn2(COO)2] unit and μ 3-1-tza linkers. Photoluminescence studies show that 1, 2 and 3 exhibit strong luminescence. The thermal analyses of the three complexes and the optical properties of 1 and 3 have also been investigated. [Copyright &y& Elsevier]