Thermal studies of some biologically active oxovanadium(IV) complexes containing 8-hydroxyquinolinate and hydroxamate ligands |
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Authors: | Reena Sharma Neeraj Sharma |
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Institution: | 1. Department of Chemistry, Himachal Pradesh University, Summer Hill, Shimla, 171005, India
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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. |
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