کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
1408458 1501741 2014 7 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Synthesis, characterization, crystal structure determination, thermal study and catalytic activity of a new oxidovanadium Schiff base complex
ترجمه فارسی عنوان
سنتز، خصوصیات، تعیین ساختار بلوری، مطالعه حرارتی و فعالیت کاتالیزوری یک مجموعه جدید پایه اکسیدوآندیوادین شیف
موضوعات مرتبط
مهندسی و علوم پایه شیمی شیمی آلی
چکیده انگلیسی


• A new oxovanadium(IV) Schiff base complex, VIVOL2, was prepared.
• It characterized by X-ray crystallography, elemental analyses and FT-IR spectroscopy.
• Suitable single crystals were obtained in DMSO with composition of VOL2(DMSO).
• The complex was tested in the oxidation reaction of cyclooctene and methyl phenyl.
• Thermal decomposition of VOL2 resulted in formation of the V2O5 nano-particles.

A new bidentate ON Schiff base ligand of HL (HL = 5-nitro-2-hydroxybenzyl-2-furylmethyl) imine), was synthesized by simple condensation reaction of 5-nitro-2-hydroxybenzaldehyde and 2-furfurylamine. Then by reaction of a methanolic solutions of the HL and VO(acac)2 in the ratio of 2:1, a new oxidovanadium(IV) Schiff base complex of VOL2 was synthesized. The Schiff base ligand and its vanadyl Schiff base complex were characterized by FT-IR, UV–vis spectra and CHN analysis. Single crystals suitable for X-ray analysis were obtained in DMSO as a VOL2(DMSO) complex. The crystal structure of the VOL2(DMSO) was determined by the single-crystal X-ray analysis. The coordination geometry around the vanadium center can be described as a distorted octahedron formed by two phenolato oxygen and two imine nitrogen atoms of the two Schiff base ligands in the equatorial position, the oxygen atom of DMSO and the oxido ion coordinated in the axial position. Thermogravimetric analysis of the VOL2 showed that the formation of mixed vanadium oxides at 450 ˚C. In addition, decomposition of the vanadyl Schiff base complex (VOL2) in air at 660 °C resulted in the formation of the V2O5 nano particles with the average size of 52 nm. The catalytic activity of the VOL2 complex was evaluated in the epoxidation of cyclooctene (90% conversion and 100% epoxide) and oxidation of methyl phenyl sulfide (100% conversion and 100% sulfoxide).

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ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Journal of Molecular Structure - Volume 1076, 5 November 2014, Pages 326–332
نویسندگان
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