Potentiometric and spectroscopic (EPR, CD and absorption spectra) studies were performed on two systems VO(IV)-di-D-galacturonic acid and VO(IV)-tri-D-galacturonic acid. The carboxylate function was shown to act as an anchor binding site. The adjacent deprotonated hydroxyl group co-ordinates to close the chelate ring. The bulky ligands protect the formation of the bis-complexes and therefore at pH above 6 the hydroxyspecies predominate.
POTENTIOMETRIC AND SPECTROSCOPIC STUDIES OF THE COMPLEX-FORMATION BETWEEN VANADYL IONS AND DI-GALACTONURIC AND TRI-GALACTURONIC ACIDS / JEZOWSKA BOJCZUK, M; Bal, W; Micera, Giovanni; Kozlowski, H.. - In: BULLETIN OF THE POLISH ACADEMY OF SCIENCES-CHEMISTRY. - ISSN 0239-7285. - 42:2(1994), pp. 181-189.
POTENTIOMETRIC AND SPECTROSCOPIC STUDIES OF THE COMPLEX-FORMATION BETWEEN VANADYL IONS AND DI-GALACTONURIC AND TRI-GALACTURONIC ACIDS
MICERA, Giovanni;
1994-01-01
Abstract
Potentiometric and spectroscopic (EPR, CD and absorption spectra) studies were performed on two systems VO(IV)-di-D-galacturonic acid and VO(IV)-tri-D-galacturonic acid. The carboxylate function was shown to act as an anchor binding site. The adjacent deprotonated hydroxyl group co-ordinates to close the chelate ring. The bulky ligands protect the formation of the bis-complexes and therefore at pH above 6 the hydroxyspecies predominate.I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
