首页 | 本学科首页   官方微博 | 高级检索  
     检索      


Thermal studies of some biologically active oxovanadium(IV) complexes containing 8-hydroxyquinolinate and hydroxamate ligands
Authors:Reena Sharma  Neeraj Sharma
Institution:1. Department of Chemistry, Himachal Pradesh University, Summer Hill, Shimla, 171005, India
Abstract:The thermal decomposition behaviours of oxovanadium(IV)hydroxamate complexes of composition VO(Q)2?n(HL1,2)n]: VO(C9H6ON)(C6H4(OH)(CO)NHO)] (I), VO(C6H4(OH)(CO)NHO)2] (II), VO(C9H6ON)(C6H4(OH)(5-Cl)(CO)NHO)] (III), and VO(C6H4(OH)(5-Cl)(CO)NHO)2] (IV) (where Q?=?C9H6NO? 8-hydroxyquinolinate ion; HL1?=?C6H4(OH)CONHO]? salicylhydroxamate ion; HL2?=?C6H3(OH)(5-Cl)CONHO]? 5-chlorosalicylhydroxamate ion; n?=?1 and 2), which are synthesised by the reactions of VO(Q)2] with predetermined molar ratios of potassium salicylhydroxamate and potassium 5-chlorosalicylhydroxamate in THF?+?MeOH solvent medium, have been studied by TG and DTA techniques. Thermograms indicate that complexes (I) and (III) undergo single-step decomposition, while complexes (II) and (IV) decompose in two steps to yield VO(HL1,2) as the likely intermediate and VO2 as the ultimate product of decomposition. The formation of VO2 has been authenticated by IR and XRD studies. From the initial decomposition temperatures, the order of thermal stabilities for the complexes has been inferred as III?>?I > II?>?IV.
Keywords:
本文献已被 SpringerLink 等数据库收录!
设为首页 | 免责声明 | 关于勤云 | 加入收藏

Copyright©北京勤云科技发展有限公司  京ICP备09084417号