Interaction of the vanadyl(IV) cation with L-ascorbic acid and related systems

被引:19
作者
Ferrer, EG [1 ]
Williams, PAM [1 ]
Baran, EJ [1 ]
机构
[1] Univ Nacl La Plata, Fac Ciencias Exactas, Ctr Quim Inorgan, RA-1900 La Plata, Argentina
来源
ZEITSCHRIFT FUR NATURFORSCHUNG SECTION B-A JOURNAL OF CHEMICAL SCIENCES | 1998年 / 53卷 / 02期
关键词
vanadyl(IV); ascorbic acid; oxidation products; solution interactions; solid complexes;
D O I
10.1515/znb-1998-0220
中图分类号
O61 [无机化学];
学科分类号
070301 ; 081704 ;
摘要
The interaction of VO2+ with L-ascorbic acid and dehydroascorbic acid was investigated by electronic spectroscopy in solution at different pH values. In the case of ascorbic acid, two different solid complexes containing one or two monodeprotonated ascorbate ligands could be isolated and characterized. With dehydroascorbic acid. interaction begins al pH = 4 but at higher pH values the ligand is hydrolysed irreversibly, generating 2,3-diketogulonic acid. A solid complex containing this ligand could be precipitated at pH = 7. Its spectroscopic behavior confirms the interaction of the cation with an enolised form of the acid.
引用
收藏
页码:256 / 262
页数:7
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