Publications (3)5.31 Total impact
-
Article: Synthesis, Structures, and Properties of Zinc(II) and Cadmium(II) Complexes with 1,2,4,5-Tetrakis(imidazol-1-ylmethyl)benzene and Multicarboxylate Ligands
[show abstract] [hide abstract]
ABSTRACT: Five new coordination polymers, namely, [Cd(L)0.5(HBTC)]·0.2H2O (1), [Cd3(L)2(BTA)2(H2O)2]·H2O (2), [Cd2(L)0.5(BTEC)]·H2O (3), [Zn3(L)(BTC)2(H2O)2]·3H2O (4), and [Zn2(μ2-OH)(L)0.5(BTA)]·H2O (5) were synthesized under hydrothermal conditions by reactions of corresponding Cd(II) or Zn(II) salts with the mixed multidentate ligands of 1,2,4,5-tetrakis(imidazol-1-ylmethyl)benzene (L) and 1,3,5-benzenetricarboxylic acid (H3BTC), 1,3,5-benzenetriacetic acid (H3BTA), 1,2,4,5-benzenetetracarboxylic acid (H4BTEC), respectively. The complexes were characterized by single crystal X-ray diffraction, IR, and thermogravimetric and elemental analyses. The Cd(II) complex 1 is a two-dimensional (2D) network with infinite one-dimensional (1D) Cd-HBTC2− chains linked together by L ligands, while the Zn(II) complex 4 with the same mixed ligands has a three-dimensional (3D) structure. The Cd(II) complex with BTA3− and L ligands (2) features an unusual 3D framework, and the Zn(II) complex 5 shows a 3D structure with (63)2(42,84)(4,63,86)2 topology. Complex 3 possesses a 3D structure consisting of a Cd-BTEC4− framework and Cd2O2-L 1D chain. The results showed that the coordination geometry of metal centers and the conformation and coordination mode of organic ligands play an important role in determining the structure and topology of the complexes. The luminescence properties of 1−5 were studied in the solid state at room temperature.05/2010; -
Article: Imidazolate-bridged dicopper(II) and copper(II)-zinc(II) complexes of macrocyclic ligand with methylimidazol pendants: Model study of copper(II)-zinc(II) superoxide dismutase.
[show abstract] [hide abstract]
ABSTRACT: Two new homo- and hetero-dinuclear complexes, [Cu(2)L(im)](ClO(4))(3)4H(2)O (1) and [CuZnL(im)](ClO(4))(3)4H(2)O (2) (where Im=1H-1midazole and L=3, 6, 9, 16, 19, 22-hexaaza-6, 19-bis(1H-imidazol-4-ylmethyl)tricycle[22, 2, 2, 2(11,14)]triaconta-1, 11, 13, 24, 27, 29-hexaene) were synthesized and characterized as model compounds for the active site of copper(II)-zinc(II) superoxide dismutase (Cu(2)Zn(2)-SOD). X-ray crystal structure analysis revealed that the metal centers in both complexes exhibit distorted trigonal-bipyramid coordination geometry and the Cucdots, three dots, centeredCu and Cucdots, three dots, centeredZn distances are both 6.02A. Magnetic and ESR spectral measurements of 1 showed antiferromagnetic exchange interactions between the imidazolate-bridged Cu(II) ions. The ESR spectrum of 2 displays typical signals of mononuclear Cu(II) complex, demonstrating the formation of heterodinuclear complex 2 rather than a mixture of homodinuclear Cu(II)/Zn(II) complexes. pH-dependent ESR and UV-visible spectral measurements manifest that the imidazolate exists as a bridging ligand from pH 6 to 11 for both complexes. The IC(50) values of 1.96 and 1.57microM [per Cu(II) ion] for 1 and 2 suggest that they are good models for the Cu(2)Zn(2)-SOD.Journal of inorganic biochemistry 09/2009; 103(8):1156-61. · 3.25 Impact Factor -
Article: pH-dependent self-assembly of copper(II) complexes with a new imidazole-containing polyamine ligand: Synthesis, structure and magnetic property
Polyhedron 27(12):2672-2680. · 2.06 Impact Factor
