Department of Chemistry, North Eastern Hill University, Shillong 793022, Meghalaya, India.
Spectrochim Acta A Mol Biomol Spectrosc. 2014 Jan 24;118:94-101. doi: 10.1016/j.saa.2013.08.063. Epub 2013 Aug 30.
Three new zinc (II)-copper (II) heterometallic trinuclear complexes of the composition [ZnCu2(L(n))(μ2-Cl)2(H2O)6]⋅2H2O (H4L(n)=H4L(1), H4L(2), H4L(3)) have been synthesized from substituted succinoyldihydrazones (H4L(n)) in methanol medium. The composition of the complexes has been established on the basis of data obtained from analytical, mass spectral studies and molecular weight determinations in DMSO. The structure of the ligand H4L(2) has been established by X-ray crystallography. The structure of the complexes has been discussed in the light of molar conductance, magnetic moment, electronic, EPR, IR and FT-IR spectral studies. The molar conductance values for the complexes fall in the region 1.2-1.7 ohm(-1) cm(2) mol(-1) in DMSO solution indicating that all of these are non-electrolyte. The magnetic moment values suggest weak M-M interaction in the structural unit of the complexes. The dihydrazone ligand is present in enol form in all of the complexes. Copper centre has tetragonally distorted octahedral stereochemistry. The EPR parameters of the complexes indicate that the copper centre has doublet state as the ground state. The electron transfer reactions of the complexes have been investigated by cyclic voltammetry.
三种新的锌(II)-铜(II)异金属三联核配合物的组成[ZnCu2(L(n))(μ2-Cl)2(H2O)6]⋅2H2O（H4L(n)=H4L(1), H4L(2), H4L(3)）已在甲醇介质中由取代的琥珀酰二腙（H4L(n)）合成得到。根据从分析、质谱研究和 DMSO 中分子量测定获得的数据，确定了配合物的组成。配体 H4L(2)的结构已通过 X 射线晶体学确定。根据摩尔电导率、磁矩、电子、EPR、IR 和 FT-IR 光谱研究，讨论了配合物的结构。配合物在 DMSO 溶液中的摩尔电导率值在 1.2-1.7 ohm(-1) cm(2) mol(-1)之间，表明它们都是非电解质。磁矩值表明在配合物的结构单元中存在弱的 M-M 相互作用。所有配合物中的二腙配体均以烯醇形式存在。铜中心具有四方形扭曲的八面体立体化学。配合物的 EPR 参数表明铜中心的基态为双重态。通过循环伏安法研究了配合物的电子转移反应。
