Synthesis,structure, and antibacterial properties of ternary rare-earth complexes with <Emphasis Type="Italic">o</Emphasis>-methylbenzoic Acid and 1,10-phenanthroline |
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| Authors: | Z M Chen S P Wang N Yang N Zhao J J Zhang R F Wang B H Zhao |
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| Institution: | (1) College of Chemistry & Material Science, Hebei Normal University, Shijiazhuang, 050016, P. R. China;(2) Experimental Center, Hebei Normal University, Shijiazhuang, 050016, P. R. China;(3) College of Life Science, Hebei Normal University, Shijiazhuang, 050016, P. R. China |
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| Abstract: | Ternary rare-earth complexes with o-methylbenzoic acid (o-MBA) and 1,10-phenanthroline (Phen) Ln2(o-MBA)6(Phen)2 · nH2O(n = 0, 1) (Ln = La, Pr, Y, Yb) were synthesized and characterized by elemental analysis, IR, X-ray diffraction, and TG-DTG means. The complex La2(o-MBA)6(Phen)2 · H2O (I) is composed of two species of binuclear molecules in which the La3+ ion is coordinated with two nitrogen atoms of Phen and seven oxygen atoms of carboxylate groups. The carboxylate groups were bonded to La3+ in three modes: chelating-bidentate, bridging-bidentate, and chelating-bridging tridentate. The La3+ ion adopted a vigorous distorted monocapped square antiprism geometry. Complex I belongs to the triclinic crystal system, P space group, lattice parameters: a = 13.058(3), b = 12.7584(11), c = 20.773(4) Å, α = 101.18(3)°, β = 93.88(3)°, γ = 115.82(3)°, V = 3283.0(11)Å3, Z = 2, ρcalcd = 1.484 mg/m3, M r = 1467.06, F(000) = 1476, μ = 1.350 mm-1. The structure was refined to R l = 0.0631 and wR 2 = 0.1504. The antibacterial activity test indicates that these complexes exhibit better antibacterial ability against Escherichia coli and Staphylococcus aureus than the corresponding rare-earth chloride or o-MBA. |
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