摘要

A series of coordination polymers based on 3,5-dinitrosalicylic acid (H(2)sal) and nine flexible bis(triazole) ligands, namely, [Cu-4(sal)(4)(L1)(2)(H2O)]center dot 2H(2)O (1), [Cu-4(sal)(4)(L-2)(2)(H2O)] (2), [Cu-2(sal)(2)(L-3)(H2O)] (3), [Cu-2(sal)(2)(L-4)(H2O)] (4), [Cu-5(sal)(4)(OH)(2)(L5)(2)(H2O)(3)]center dot H2O (5), [Cu(sal)(L6)] (6), [Cu-2(sal)(2)(L7)] (7), [Cu(sal)(L-8)]center dot 0.5H(2)O (8), [Cd-2(sal)(2)(L1)(H2O)(2)] (9), [Cd-2(sal)(2)(L7)(3)] (10) and [Cd-4(sal)(4)(L9)(4)] (11), where L1 = 1,2-bis(1,2,4-triazol-1-yl)ethane, L2 = 1,3-bis(1,2,4-triazol-1-yl)propane, L3 = 1,4-bis(1,2,4-triazol-1-yl) butane, L4 = 1,5-bis(1,2,4-triazol-1-yl)pentane, L5 = 1,5-bis(1,3,4-triazol-1-yl) pentane, L6 = 1,6-bis(1,2,4-triazol-1-yl) hexane, L7 = 1,10-bis(1,2,4-triazol-1-yl)decane, L8 = 1,4-bis((1H-1,2,4-triazol-1-yl) methyl)benzene and L9 = 1,1'-(2,2'-oxybis(ethane-2,1-diyl))bis(1H-1,2,4-triazole), have been synthesized and characterized by single crystal X-ray diffraction, elemental analyses, IR spectra, PXRD spectra and TG analysis. Compounds 1 and 4 possess one-dimensional (1D) double chains. Compounds 2, 3 and 5 show two-dimensional (2D) 4(4) networks. Compound 6 displays a three-dimensional (3D) uninodal eight-connected self-penetrating framework with the 4(20)6(8) topology. Compound 7 reveals a 2D 2-fold interpenetrating 4(4)-sql network. Compounds 8 and 9 display 2D undulated layers. Compound 10 shows a 1D chain. Compound 11 reveals a discrete tetranuclear cluster. The UV-vis spectra and optical energy gap of 1-11 have also been investigated in detail.