Chemistry Department, Faculty of Science, Mansoura University, Mansoura, Dakhalia 35516, Egypt.
Spectrochim Acta A Mol Biomol Spectrosc. 2010 May;75(5):1516-22. doi: 10.1016/j.saa.2010.02.009. Epub 2010 Feb 11.
New VO(2+), Mn(2+), Co(2+), Ni(2+) Cu(2+) and Zn(2+) complexes of 2,5-hexanedione bis(isonicotinylhydrazone) [H(2)L] have been synthesized and characterized. The analyses confirmed the formulae: [VO(L)].H(2)O, [Mn(2)(H(2)L)Cl(2)(H(2)O)(6)]Cl(2), [Co(L)(H(2)O)(2)].2H(2)O, [Ni(HL)(OAc)].H(2)O, [Cu(L)(H(2)O)(2)].2H(2)O, [Cu(L)].2H(2)O and [Zn(L)(H(2)O)(2)]. The formulae of [Ni(HL)(OAc)].H(2)O, [Zn(L)(H(2)O)(2)] and [Mn(2)(H(2)L)Cl(2)(H(2)O)(6)]Cl(2), are supported by mass spectra. The molecular modeling of H(2)L is drawn and showed intramolecular hydrogen bonding. The ligand releases two protons during reaction from the two amide groups (NHCO) and behaves as a binegative tetradentate (N(2)O(2)); good evidence comes from the (1)H NMR spectrum of [Zn(L)(H(2)O)(2)]. The ligand has a buffering range 10-12 and pK's of 4.62, 7.78 and 9.45. The magnetic moments and electronic spectra of all complexes provide a square-planar for [Cu(L)].2H(2)O, square-pyramidal for [VO(L)].H(2)O and octahedral for the rest. The ESR spectra support the mononuclear geometry for [VO(L)].H(2)O and [Cu(L)(H(2)O)(2)].2H(2)O. The thermal decomposition of the complexes revealed the outer and inner solvents where the end product in most cases is metal oxide.
已合成并表征了 2,5-己二酮双（异烟酰基腙）[H(2)L]的 VO(2+)、Mn(2+)、Co(2+)、Ni(2+)、Cu(2+)和 Zn(2+)的新配合物。分析证实了以下公式：[VO(L)].H(2)O、[Mn(2)(H(2)L)Cl(2)(H(2)O)(6)]Cl(2)、[Co(L)(H(2)O)(2)].2H(2)O、[Ni(HL)(OAc)].H(2)O、[Cu(L)(H(2)O)(2)].2H(2)O、[Cu(L)].2H(2)O 和[Zn(L)(H(2)O)(2)].配合物的化学式[Ni(HL)(OAc)].H(2)O、[Zn(L)(H(2)O)(2)]和[Mn(2)(H(2)L)Cl(2)(H(2)O)(6)]Cl(2)得到质谱的支持。绘制了 H(2)L 的分子模型，并显示了分子内氢键。配体在两个酰胺基团（NHCO）的反应中释放出两个质子，表现为双负四齿体（N(2)O(2)）；来自[Zn(L)(H(2)O)(2)].的（1）H NMR 光谱提供了很好的证据。配体的缓冲范围为 10-12，pK 值为 4.62、7.78 和 9.45。所有配合物的磁矩和电子光谱提供了[Cu(L)].2H(2)O 的正方形平面，[VO(L)].H(2)O 的正方形金字塔和其余的八面体。ESR 光谱支持[VO(L)].H(2)O 和[Cu(L)(H(2)O)(2)].2H(2)O 的单核几何形状。配合物的热分解揭示了外层和内层溶剂，大多数情况下最终产物是金属氧化物。
