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- Meghdadi, S., et al.
(author)
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Synthesis, X-ray crystal structure, and electrochemistry of copper(II) complexes of a new tridentate unsymmetrical Schiff base ligand and its hydrolytically rearranged isomer
- 2012
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In: Inorganica Chimica Acta. - : Elsevier BV. - 0020-1693. ; 385, s. 31-38
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Journal article (peer-reviewed)abstract
- A new unsymmetrical Schiff base ligand HL1, HBacabza, and its copper(II) complexes [Cu2L21(OAc)(2)] (1) and [Cu2L22(N-3)(2)]center dot 2H(2)O (2) with HBacabza = 3-(2- aminobenzylimino)-1-phenylbutan-1-one as HL1 and its hydrolytically rearranged isomer 3-(2-aminomethylphenyleneimino)-1-phenylbutan-1-one as HL2, have been synthesized and characterized by elemental analyses and spectroscopic methods. The rearrangement of HL1 to HL2 occurs in a hydrolysis-recondensation process in the reaction of HL1 with Cu(ClO4)(2)center dot 6H(2)O and NaN3. The crystal structures of the ligand and its complexes have been determined by single crystal X-ray diffraction. The deprotonated Bacabza coordinates to the metal center as a tridentate ligand. The acetate anion coordinates through one oxygen atom in complex 1 leading to a mono-atomic acetate oxygen-bridging dimeric copper(II) complex. Similarly, the azide anion coordinates through one nitrogen atom in complex 2 leading to a mono-atomic azide nitrogen-bridging dimeric copper(II) complex. The copper(II) ions adopt a distorted square pyramidal (4 + 1) coordination in these two complexes. The cyclic voltammetric studies of these complexes in N, N-dimethylformamide indicate that the reduction process corresponding to Cu-II/Cu-I is electrochemically irreversible in complex 1, presumably due to the structural changes during the course of redox reaction, and quasi-reversible in complex 2.
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| 2. |
- Meghdadi, S., et al.
(author)
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Synthesis, X-ray structure, electrochemistry, and theoretical studies of palladium(II) complex with a tetradentate bis(quinoline-2-carboxamide) ligand
- 2012
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In: Journal of the Iranian Chemical Society. - : Springer Science and Business Media LLC. - 1735-207X .- 1735-2428. ; 9:1, s. 85-92
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Journal article (peer-reviewed)abstract
- The title complex [Pd(Me(2)bqb)] (1), [Me(2)bqb(2-) = 1,2-bis(quinoline-2-carboxamide)-4,5-dimethyl-benzene dianion], has been synthesized and characterized by elemental analyses and spectroscopic methods, and the crystal and molecular structure of [Pd(Me(2)bqb)] has been determined by X-ray crystallography. The complex exhibits distorted square-planar PdN4 coordination geometry with two short and two long Pd-N bonds (Pd-N similar to 1.957 and similar to 2.095 angstrom, respectively). In addition to the molecular geometry from X-ray experiment, theoretical studies have been carried out on the structure of the complex at the density functional theory (DFT-B3LYP) level in conjunction with effective core potential basis set (LANL2DZ) for Pd atom and 6-311++G(d,p) basis set for N, O, C and H atoms. Electrochemical studies in CH2Cl2 solution revealed A reversible redox process corresponding to the Pd-II/Pd-III couple with E (1/2) at 0.924 V (vs. SCE).
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