| The d electronic orbit of d10 metal is full of electronic and the d-d electron transtion of d10 metal can't be taken place. But the d10 metal complexes with organic ligands which have conjugative systems have luminescenct properties. The d10 metal complexes have attracted great interest because of their potential applications in the fields of sensors, photochemistry and electroluminescent devices. Five d10 metal complexes [Cd(phen)(pdc)(Bzn)0.5]n (1), [Cd(phen)(1,3-BDC)]n (2), [Cd2(phen)2(2,4'- bpdc)2(H2O)2]n (3), Cd(phen)2(NO3)(NO2) (4) and Zn(phen)(pdc)(H2O)·H2O (5) have been designed and synthesized in this paper by using benzidine (Bzn), pyridine-2,6- dicarboxylic acid (H2pdc), 1,10'-phenanthroline (phen), benzene-1,3- dicarboxylic acid (1,3-H2BDC), 1,1'-biphenyl-2,4'-dicarboxylic acid (2,4'-H2bpdc), zinc acetate and cadmium nitrate. The structures have been characterized by elemental analysis, IR spectra, 1H NMR, X-ray single-crystal diffraction. The thermal stabilities have been characterized by thermogravimetric analysis. The luminescence properties have been characterized by UV and fluorescence spectrum.The yellow crystal of [Cd(phen)(pdc)(Bzn)0.5]n (1) was obtained by the reaction of Bzn, H2pdc, phen and Cd(NO3)2·4H2O. Complex 1 is a 1D chain coordination polymer and Cd(II) is coordinated with three rigid ligands. The Cd(II) atom adopts a seven-coordinate manner. Two Cd(II) is bridged by two O atoms from two pdc2- ligands to form a dimeric Cd2 unit. The dimer is further linked by two N atoms from one benzidine ligand to form a 1D zig-zag chain. At room temperature, complex 1 emits blue fluorescence in DMF or DMSO solution and in the solid state.The colorless crystal of [Cd(phen)(1,3-BDC)]n (2) was obtained by the reaction of Bzn, 1,3-H2BDC, phen and Cd(NO3)2·4H2O. In the basic unit of complex 2, the cadmium atom adopts a six-coordinate manner. Two cadmium atoms are bridged by two dimonodentate carboxylate groups separately from two 1,3-BDC2- ligands. Complex 2 is extended into the 1D double chain through 1,3-BDC2- ligands. There are fourmembered ring pores in the 1D twisted double chain. At room temperature, complex 2 emits purple fluorescence in DMSO solution and blue fluorescence in the solid state.The brown block crystal of [Cd2(phen)2(2,4'-bpdc)2(H2O)2]n (3) was obtained by the reaction of 2,4'-H2bpdc, phen and Cd(NO3)2·4H2O. In the basic unit of complex 3, there are two crystallographically indepent cadmium atoms. Each Cd(II) adopts a six-coordinate manner. Two Cd(II) are briged by two 3-O atoms. Complex 3 is extended into the 1D double chain through 2,4'-bpdc2- ligands. At room temperature, complex 3 emits blue fluorescence in DMSO solution and blue-green fluorescence in the solid state. The colorless crystal of Cd(phen)2(NO3)(NO2) (4) was obtained by the reaction of Bzn, phen and Cd(NO3)2·4H2O. In the basic unit of complex 4, the cadmium atom is coordinated in pentagonal bipyramidal geometry by four N atoms and three O atoms. Complex 4 is extended into the 3D supramolecular structure throughπ–πstacking interactions. Complex 4 have blue-purple luminescence at room temperature in the solid state.The colorless crystal of Zn(phen)(pdc)(H2O)·H2O (5) was obtained by the reaction of H2pdc, Bzn, phen and Zn(OAc)2·2H2O. In the basic unit of complex 5, the zinc atom adopts a six-coordinate manner. There is one molecule lattice water in the unit. At room temperature, complex 5 emits purple fluorescence in DMSO solution and blue fluorescence in the solid state.The photoluminescent quantum yield of 15 and ligands has been characterized. The photoluminescent quantum yield of the metal complexes is higher than that of ligand... |
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