Vanadium(IV) and oxovanadium(IV) complexes of hydroxamic acids and related ligands

Complex formation between oxovanadium(IV) and a series of hydroxamic or hydroxamic-like ligands (acetohydroxamic, benzohydroxamic, 2-hydroxypyridine- N-oxide and N-phenyl-benzohydroxamic acids) has been investigated in solution by EPR spectroscopy. VO(IV) complexes involving the ligand-to-metal mola...

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Bibliographic Details
Published inJournal of inorganic biochemistry Vol. 48; no. 4; pp. 279 - 287
Main Authors Dessì, Alessandro, Micera, Giovanni, Sanna, Daniele, Erre, Liliana Strinna
Format Journal Article
LanguageEnglish
Published New York, NY Elsevier Inc 01.12.1992
Elsevier Science
Subjects
Biological and medical sciences
Fundamental and applied biological sciences. Psychology
Interactions. Associations
Intermolecular phenomena
Molecular biophysics
EPR spectrometry
Hydroxamic acid
Molecular association
Chelating agent
Organic ligand
Vanadium Complexes
Oxo complex
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Summary:Complex formation between oxovanadium(IV) and a series of hydroxamic or hydroxamic-like ligands (acetohydroxamic, benzohydroxamic, 2-hydroxypyridine- N-oxide and N-phenyl-benzohydroxamic acids) has been investigated in solution by EPR spectroscopy. VO(IV) complexes involving the ligand-to-metal molar ratio of 2:1 have also been isolated in the solid state. The results show that the simple hydroxamic ligands (acetohydroxamic and benzohydroxamic acids) can undergo two deprotonation processes and thus act as either hydroxamato(1−) or hydroximato(2−) ligands. A similar dissociation pattern is not possible for N-phenyl-benzohydroxamic acid and the hydroxamic-like ligand 2-hydroxypyridine- N-oxide, which are able to yield only a hydroxamato(1−) coordinating anion. All the ligands form hexa-coordinate tris-chelated complexes of V(IV) after displacing the oxo group from VO(IV).
ISSN:0162-0134
1873-3344
DOI:10.1016/0162-0134(92)84054-Q