Unusual one-dimensional branched-chain structures assembled by a novel imidazole-containing tripodal ligand with cadmium(II) salts and their fluorescent property

摘要

Three novel coordination polymers [Cd-3(I.)(2)(mu-Br)mu-Cl)Br3Cl] (1), [Cd-3(L)(2)(mu-Cl)(2)Cl-4] (2) and [Cd(L)Cl](2)[CdCl4] (.) H2O (3) were obtained by reactions of an imidazole-containing tripodal ligand N-l-(2-aminoethyl)-N-l-(2-imidazolethyl)-ethane-1,2-diamine (L) with Cd(II) salts. Their structures were determined by X-ray crystallography. Crystal data for 1, monoclinic system, P2(1)/c, a = 7.752(4) angstrom, b = 31.70(2) angstrom, c = 14.012(7) angstrom, beta = 109.439(7)degrees, V = 3247(3) angstrom(3), Z = 4. 2, monoclinic system, P2(1)/c, a = 7.6564(15) angstrom, b = 31.433(6) angstrom(3), c = 13.925(3) angstrom, beta = 109.89(3)degrees, V = 315 1.1(11) angstrom(3) = 4. 3, orthorhombic system, Pbcn, a = 22.950(2) angstrom, b = 8.435(7) angstrom, c = 17.360(2) angstrom, V = 3360.3(51) angstrom(3), Z = 4. Complexes 1 and 2 have similar one-dimensional (1 D) branched-chain structure while complex 3 features a I D zigzag cationic chain with [CdCI4](2-) serving as counter anion. The photoluminescent measurements reveal that all the complexes exhibit blue fluorescence at room temperature in the solid state. (c) 2006 Elsevier Inc. All rights reserved.