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001-es BibID:	BIBFORM082217
035-os BibID:	(Scopus)84918830134 (WoS)000347467800014
Első szerző:	Hadháziné Raics Mária (vegyész)
Cím:	Copper(II), nickel(II) and zinc(II) complexes of hexapeptides containing separate aspartyl and histidyl residues / Mária Raics, Daniele Sanna, Imre Sóvágó, Csilla Kállay
Dátum:	2015
ISSN:	0020-1693
Megjegyzések:	Copper(II), nickel(II) and zinc(II) complexes of two N-terminally free and C-terminally blocked hexapeptides, NH2-ADAAAH-NH2 and NH2-AADAAH-NH2, containing separate aspartyl and histidyl residues have been studied by potentiometric, UV-Vis, CD and ESR spectroscopic methods. The amino termini were found as the primary anchoring sites of both ligands for the complexation with all three metal ions. The β-carboxylate function of the second or third aspartyl residue enhances the thermodynamic stability of the copper(II) and nickel(II) complexes and shifts the deprotonation of the subsequent amide functions into a more alkaline pH range. In the case of NH2-AADAAH-NH2 the imidazole-N donor of the histidyl residue does not have a significant contribution to the overall stability of the mononuclear complexes. The side chain imidazole, however, can be an independent metal binding site resulting in the formation of dinuclear or even mixed metal complexes. The stabilizing role of the histidyl residue is much more pronounced in the complexes of the NH2-ADAAAH-NH2 peptide. In this case a tridentately (NH2,N?,β-COO?)-coordinated species is formed and its stability is significantly enhanced by the macrochelation of the side chain imidazole. The presence of two anchoring sites (terminal amino and side chain imidazole) in one molecule enhances the stability of the corresponding zinc(II) complexes, too, but the amide nitrogens are not involved in metal binding in this case.
Tárgyszavak:	Természettudományok Kémiai tudományok idegen nyelvű folyóiratközlemény külföldi lapban folyóiratcikk Copper(II) Nickel(II) Zinc(II) Peptides Histidyl Aspartyl
Megjelenés:	Inorganica Chimica Acta. - 426 (2015), p. 99-106. -
További szerzők:	Sanna, Daniele (1956-) (vegyész) Sóvágó Imre (1946-) (vegyész) Kállay Csilla (1978-) (vegyész)
Pályázati támogatás:	OTKA 105156 OTKA TÁMOP 4.2.4. A/1-11-1-2012-0001 TÁMOP TÁMOP 4.2.2.A-11/1/KONV-2012-0043 TÁMOP
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