Syntheses and Crystal Structures of Ternary Complexes of Zinc(Ⅱ) and Cadmium(Ⅱ) with 3-Aminobenzoic Acid and 1,10-Phenanthroline

摘要

Two new ternary complexes [Zn(3-aba)_2(phen)]·2.58H_2O 1 and {[Cd(3-aba)-(phen)2]·(NO_3)·(1.5H_2O)}_n 2 (3-aba = 3-aminobenzoic acid anion, phen = 1,10-phenanthroline) were synthesized and characterized by elemental analysis, IR, UV spectrum and X-ray diffraction. Complex 1 crystallizes in the rhombohedral system, space group R3 with a = 3.5733(3), b = 3.5733(3), c = 1.1231(2) nm, V= 12.419(3) nm~3, C_(26)H_(25.17)N_4O_(6.58)Zn, M_r= 564.37, Z = 18, F(000) = 5253, μ = 0.937 mm~(-1), D_c = 1.358 g/cm~3 R= 0.0668 and wR = 0.1690 for 2424 observed reflections (I > 2σ(I)). Complex 2 belongs to the tetragonal system, space group P4cc with a = 2.88451(10), b = 2.88451(10), c = 1.55571(11) nm, V = 12.9441(11) nm~3, C_(31)H_(25)CdN_6O_6.50, M_r = 697.97, Z = 16, F(000) = 5648, μ = 0.727 mm~(-1), D_c= 1.433 g/cm~3, R = 0.0607 and wR = 0.1742 for 3468 observed reflections (I > 2σ(I)). Complex 1 displays a mononuclear structure. The carboxylate group of 3-aminobenzoic acid anion coordinates to Zn(Ⅱ) in a chelating bidentate mode, and the nitrogen atom of the ligand does not involve in coordination. Complex 2 exhibits a one-dimensional chain structure with 3-aminobenzoic acid anion coordinating to Cd(Ⅱ) in a μ_2-bridging mode through its nitrogen atom and one of its oxygen atoms.