کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
1340810 979757 2007 9 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Synthesis and structural studies on di-oxovanadium(V) complexes of N(4)-substituted pyrazole based thiosemicarbazones
موضوعات مرتبط
مهندسی و علوم پایه شیمی شیمی معدنی
پیش نمایش صفحه اول مقاله
Synthesis and structural studies on di-oxovanadium(V) complexes of N(4)-substituted pyrazole based thiosemicarbazones
چکیده انگلیسی

Three mononuclear cis-dioxovanadium(V) complexes of tridentate thiosemicarbazones derived from 5-methyl-3-formylpyrazole (MPA) and N(4)-methyl/ethyl/dimethyl thiosemicarbazide have been synthesized and characterized. Single crystal X-ray analyses were performed with [VO2L1] (1), [VO2L2] (2) and [VO2L3] (3), where L1, L2 and L3 denote the [1 + 1] thiosemicarbazone mono-anions derived from MPA and N(4)-substituted methyl/ethyl/dimethyl thiosemicarbazide respectively. In all the complexes the vanadium atom is in a distorted square pyramidal geometry with a N2SO2 chromophore. The interesting finding in the work is that in complexes 1 and 2, the thioimine nitrogen unusually participates in coordination whereas in 3 it is the azomethine nitrogen (quite usual) which is involved in the coordination process.

cis-Dioxo vanadium(V) complexes (1–3) of three different tridentate thiosemicarbazone ligands synthesized from 5-methyl-3-formylpyrazole and N(4)-substituted thiosemicarbazides have been prepared and structurally characterized. All the three complexes have square pyramidal geometry. In 2, two asymmetric units appreciably differ in their conformations. In 1 and 2, the pyrazolyl N, the thioimine N (quite unusual) and the thiolato S of the corresponding tridentate ligand molecule coordinate to the vanadium atom whereas in 3, the respective ligand utilizes the azomethine nitrogen (usual) instead of the thioimine nitrogen to coordinate the vanadium atom along with the other two donor sites.Figure optionsDownload as PowerPoint slide

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Polyhedron - Volume 26, Issue 4, 1 March 2007, Pages 773–781
نویسندگان
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