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001-es BibID:	BIBFORM056651
Első szerző:	Jakusch Tamás
Cím:	Vanadate complexes of 3-hydroxy-1,2-dimethyl-pyridinone : speciation, structure and redox properties / Tamás Jakusch, Éva A. Enyedy, Károly Kozma, Zsófia Paár, Attila Bényei, Tamás Kiss
Dátum:	2014
ISSN:	0020-1693
Megjegyzések:	Several articles were published about the vanadate?3-hydroxy-1,2-dimethyl-pyridinone (Hdhp) system,however, the results are contradictory and not complete: pH-potentiometry and 51V NMR spectroscopywere used to clarify this complicated system. The eleven peaks in the spectra at different chemical shiftswere assigned to ten stoichiometrically different compounds; four of them are new, never identified orassigned before. Besides the simple mono (in two different protonation states) and bis complexes (inthree different protonation states) a tris complex, three dinuclear and a trinuclear complex were foundbased on the 51V NMR spectra measured at different pH values and various metal ion concentrationsand metal-to-ligand ratios. As a joint evaluation of the two methods, overall stability constants were calculatedfor all species.X-ray structure of the potassium salt of the bis complex, [V(V)O2(dhp)2] was also determined. Thetrans effect of the oxido-oxygens results in maltolato-type coordination of the ligand instead of thecatecholate-like chelation.The redox properties of [V(V)O2(dhp)2] and some other prodrug vanadium(V) bis complexes wereinvestigated by spectrophotometry in aqueous solution via their reduction by glutathione (GSH) andL-ascorbic acid (ASC) under strictly anaerobic conditions and by cyclic voltammetry at physiologicalpH. The reduction was found to be much faster by ASC in all cases as compared with GSH and the reactionrate of the reduction of [V(V)O2(dhp)2] was prominently high most probably due to the formation of thesignificantly higher stability of the corresponding vanadium(IV) complex.
Tárgyszavak:	Természettudományok Kémiai tudományok idegen nyelvű folyóiratközlemény külföldi lapban
Megjelenés:	Inorganica Chimica Acta. - 420 (2014), p. 92-102. -
További szerzők:	Enyedy Éva Anna (1975-) (vegyész) Kozma Károly Paár Zsófia Bényei Attila (1962-) (vegyész) Kiss Tamás
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