A new oxidovanadium(Ⅳ) Schiff base complex containing asymmetric tetradentate ONN0O0Schiff base ligand:Synthesis,characterization,crystal structure determination,thermal study and catalytic activity

作     者：Gholamhossein Grivani Abbase Ghavami Vclav Eigner Michal Duek Aliakbar Dehno Khalaji 

作者机构：School of ChemistryDamghan University Department of Solid State ChemistryInstitute of Chemical TechnologyTechnick Institute of Physics ASCR Department of ChemistryFaculty of ScienceGolestan University 

出 版 物：《Chinese Chemical Letters》 (中国化学快报（英文版）)

年 卷 期：2015年第26卷第6期

页      面：779-784页

核心收录：

学科分类：081704[工学-应用化学] 07[理学] 070304[理学-物理化学(含∶化学物理)] 08[工学] 0817[工学-化学工程与技术] 0703[理学-化学] 

基　　金：the Damghan University Golestan University for financial support supported by the project 14-03276S of the Czech Science Foundation 

主　　题：Oxidovanadium(IV) Scbiff base Crystal structure Nanopartide Epoxidation 

摘      要：After synthesis of an asymmetric tetradentate ONN＇O＇ Schiff base ligand （H2L） followed by reaction of the synthesized H2L with an equimolar mixture of methanolic solutions of the VO（acac）2, a new oxidovanadium（IV） Schiff base complex （VOL） was synthesized. The Schiff base ligand and its complex were characterized by FT-IR and UV-vis spectra and C, H, N analysis, The crystal structure of VOL was also determined by single crystal X-ray analysis. The VOL complex crystallizes in monoclinic space group Cc. The Schiffbase ligand acts as a tetradentate ligand through its two＇iminic nitrogens and two phenolic and acetylacetonate oxygens. Thermogravimetric analysis of the VOL showed that it decomposes in two steps and converts to mixed vanadium oxides at 477℃. In addition, thermal decomposition of the VOL complex in air at 660 ℃ leads to formation of V2O5 nanoparticles with the average size estimated from XRD 49 nm. The catalytic activity of the VOL complex was investigated in the epoxidation reaction and different reaction parameters were optimized. The results showed that the cyclic alkenes were efficiently converted to the corresponding epoxides, whereas the VOL did not appreciably convert the linear alkenes.