Chandra Sulekh, Jain Deepali, Sharma Amit Kumar
Department of Chemistry, Zakir Husain College (University of Delhi), J.L. Nehru Marg, New Delhi 110002, India.
Spectrochim Acta A Mol Biomol Spectrosc. 2009 Jan;71(5):1712-9. doi: 10.1016/j.saa.2008.06.028. Epub 2008 Jul 3.
The synthesis of novel bimetallic Cu(II) complexes with general stoichiometry [Cu(2)(H(2)L)X(2)(H(2)O)(2)], [Cu(2)(H(2)L)(CH(3)COO)(2)] and [Cu(2)(H(2)L)SO(4)(H(2)O)(2)] (where H(2)L=dideprotonated ligand and X=NO(3)(-) and Cl(-)) derived from tetradentate ligand obtained by the condensation of 1,4-diformyl piperazine with carbohydrazide has been discussed. The complexes were characterized by elemental analyses, molar conductance measurements, magnetic susceptibility measurements, IR, mass, UV, EPR spectral studies and thermogravimetric analyses. The value of magnetic moments indicates that the complexes are paramagnetic and show the antiferromagnetic interaction between the two metal centres. The complexes possess the square planar coordination environment. The values of covalency measurements, i.e., in-plane sigma-bonding alpha(2), in-plane pi-bonding beta(2) and orbital reduction factor k indicate the covalent nature of complexes.
已讨论了新型双金属铜（II）配合物的合成，其化学计量通式为[Cu₂(H₂L)X₂(H₂O)₂]、[Cu₂(H₂L)(CH₃COO)₂]和[Cu₂(H₂L)SO₄(H₂O)₂]（其中H₂L为双去质子化配体，X = NO₃⁻和Cl⁻），这些配合物由1,4 - 二甲酰基哌嗪与 carbohydrazide缩合得到的四齿配体衍生而来。通过元素分析、摩尔电导率测量、磁化率测量、红外光谱、质谱、紫外光谱、电子顺磁共振光谱研究和热重分析对配合物进行了表征。磁矩值表明配合物是顺磁性的，并且在两个金属中心之间显示出反铁磁相互作用。配合物具有平面正方形配位环境。共价性测量值，即面内σ键合α₂、面内π键合β₂和轨道还原因子k表明配合物具有共价性质。
