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The reaction of Zn(ClO4)2·6H2O with 3,3’-bis(2-benzimidazolyl)-2,2’-dipyridine (L) gave a mononuclear zinc(II) complex: [ZnL2](ClO4)2·2DMF·4H2O, which was structurally characterized by EA, IR, UV, 1H NMR, fluorescence spectrum and single-crystal X-ray diffraction. The crystal (C54H54Cl2N14O14Zn, Mr = 1259.38) belongs to the monoclinic system, space group C2/c with a = 20.874(2), b = 14.9953(16), c = 20.462(3) , β = 101.553(2)°, V = 6274.8(13) 3, Z = 4, Dc = 1.333 g/cm3, F (000) = 2608, μ(MoKα) = 0.548 mm–1, R = 0.0682 and wR = 0.1931 for 4984 observed reflections with I > 2σ(I). The Zn(II) is four-coordinated in a slightly distorted tetrahedral geometry through four N atoms from four benzimidazole units of two ligands. In the crystal lattice, the [ZnL2]2+ cations are linked to each other by extensive intermolecular hydrogen bonds between nitrogen atoms of benzimidazole rings, water and DMF molecules.
The reaction of Zn (ClO4) 2.6H2O with 3’-bis (2-benzimidazolyl) -2,2’-dipyridine (L) gave a mononuclear zinc (II) complex: [ZnL2] (ClO4) 2.2DMF · 4H2O, which was structurally characterized by EA, IR, UV, 1H NMR, fluorescence spectrum and single-crystal X-ray diffraction. The crystal (C54H54Cl2N14O14Zn, Mr = 1259.38) belongs to the monoclinic system, space group C2 / c with a = 20.874 (2) b = 14.9953 (16) c = 20.462 (3) β β = 101.553 (2) ° V = 6274.8 (13) 3 Z = 4 Dc = 1.333 g / cm3 F (000) = 2608, μ (MoKα) = 0.548 mm-1, R = 0.0682 and wR = 0.1931 for 4984 observed reflections with I> 2σ (I). The Zn (II) is four- coordinated in a slightly distorted tetrahedral geometry Through four N atoms from four benzimidazole units of two ligands. In the crystal lattice, the [ZnL2] 2+ cations are linked to each other by extensive intermolecular hydrogen bonds between nitrogen atoms of benzimidazole rings, water and DMF molecules.