کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
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1407744 | 1501895 | 2007 | 6 صفحه PDF | دانلود رایگان |
A new series of the chloride transition-metal complexes containing the ligand diethyl 2-pyridylmethylphosphonate (2-pmpe) of general formula M(2-pmpe)2Cl2 (M = Ni, Co, Mn) and M(2-pmpe)Cl2 (M = Co, Zn,) were prepared. The complexes were identified and characterized by elemental analysis, spectroscopic and magnetic studies. For Cd4(2-pmpe)4Cl8 X-ray crystal structure was determined. The structure is based on a chloro-bridged tetranuclearcadmium quasi cubane cluster, in which each cadmium atom is chelated by one N,O-chelate 2-pmpe ligand and coordinated with four bridging chloride atoms. The ligand containing two donor atoms, heterocyclic pyridyl nitrogen and phosphoryl oxygen atoms binds in a didentate chelate manner in all complexes. Two compounds were obtained with cobalt chloride salt, exhibiting tetrahedral (1:1) and octahedral (1:2 metal to ligand molar ratio) arrangements of cobalt ions. The octahedral Ni(II), Co(II) and Mn(II) complexes are izostructural. Geometry of Zn(2-pmpe)Cl2 is consistent with a pseudotetrahedral environment of Zn(II) ion. The spectroscopic properties of Zn(II), and magnetic behavior of Ni(II), Co(II) and Mn(II) complexes indicate mononuclear structure of all compounds.
Journal: Journal of Molecular Structure - Volume 843, Issues 1–3, 29 October 2007, Pages 26–31