CCL

Összesen 2 találat.
#/oldal:
Részletezés:
Rendezés:

1.

001-es BibID:BIBFORM085976
Első szerző:Farkas Etelka (vegyész)
Cím:Factors affecting the metal ion-hydroxamate interactions: effect of the position of the peptide function in the connecting chain on the Fe(III), Mo(VI) and V(V) complexation of some new desferrioxamine B (DFB) model dihydroxamic acids / Etelka Farkas, Péter Buglyó, Éva A. Enyedy, Veronika A. Gerlei, Amelia M. Santos
Dátum:2002
ISSN:0020-1693
Megjegyzések:Three new dihydroxamic acids (HO(CH3)NCO (CH2) x CO NH (CH2) y CON(CH3)OH, where the related x and y values are as follows: 2,5; 3,4 and 3,3) with different length of the connecting chains containing the peptide group in different positions between the two functional groups were synthesized and their complexation with Fe(III), Mo(VI) and V(V) were studied by pH-potentiometric and spectrophotometric methods. Both the structure and length of the connecting chain in the 2,5-dihydroxamic acid (2,5-DIHA) are the same as those in the natural siderophore, desferrioxamine B (DFB). Although the stability of the monochelated complexes formed with all three dihydroxamic acids are similar, 2,5-DIHA forms significantly more stable bis-chelated complexes than the other two ligands with the three metal ions studied. The results support the hypothesis that the arrangement of the two chelating functions in 2,5-DIHA is in a proper preorganization for the coordination in octahedral complexes to metal ions having similar ionic radius as iron(III) has.
Tárgyszavak:Természettudományok Kémiai tudományok idegen nyelvű folyóiratközlemény külföldi lapban
folyóiratcikk
Dihydroxamic acids
Fe(III)
Mo(VI) and V(V) complexes
Desferrioxamine B models
Megjelenés:Inorganica Chimica Acta. - 339 (2002), p. 215-223. -
További szerzők:Buglyó Péter (1965-) (vegyész) Enyedy Éva Anna (1975-) (vegyész) Gerlei Veronika A. Santos, Amelia M.
Pályázati támogatás:T034674
OTKA
Internet cím:Szerző által megadott URL
DOI
Intézményi repozitóriumban (DEA) tárolt változat
Borító:

2.

001-es BibID:BIBFORM084879
Első szerző:Farkas Etelka (vegyész)
Cím:Factors affecting the metal ion-hydroxamate interactions II: effect of the length of the connecting chain on the Fe(III), Mo(VI) and V(V) complexation of some new desferrioxamine B (DFB) model dihydroxamic acids / Farkas Etelka, Buglyó Péter, Enyedy Éva A., M. Amelia Santos
Dátum:2004
ISSN:0020-1693
Megjegyzések:Three new dihydroxamic acids (HO(CH3)NCO?(CH2)2?CO?NH?(CH2)x?CON(CH3)OH where the x values are 4; 3 and 2, and the compounds are abbreviated as 2,4-DIHA, 2,3-DIHA and 2,2-DIHA), containing the peptide group in a certain position to one of the two functional groups and in different distances to the other one, were synthesized and their complexation with Fe(III), Mo(VI) and V(V) was studied by pH-potentiometric, spectrophotometric and in some cases by CV methods to evaluate the redox behaviour of the Fe(III) complexes and assess their potential biological activity as siderophore models. All these compounds are structural models for the natural siderophore, desferrioxamine B (DFB). The results were compared to those of the complexes of 2,5-DIHA having the same connecting chain structure and length as DFB has, and the effects of the length of the connecting chain on the co-ordination mode and on the stability of the complexes formed were evaluated. Very similar stability of the mono-chelated complexes formed with all these dihydroxamic acids was found. All the results obtained suggest that one dihydroxamic acid (even the 2,2-DIHA) is able to complete the four coordination sites of a MoO 2? 2 core forming simple mononuclear complexes. Favoured monomeric structures of the bis-chelated complexes of these dihydroxamic acids are also suggested with V(V) having the smallest ionic radius among the three metal ions studied. In the case of iron(III), however, clear indication was obtained for the slightly different complexation behaviour of 2,2-DIHA. Namely, the formation of the mononuclear bis-chelated complex with this shortest ligand seems to have sufficient strain to induce the formation of bimetallic species such as [Fe(2,2-DIHA)2Fe)]2?. 2004 Elsevier B.V. All rights reserved.
Tárgyszavak:Természettudományok Kémiai tudományok idegen nyelvű folyóiratközlemény külföldi lapban
folyóiratcikk
Dihydroxamic acids
Fe(III)
Mo(VI) and V(V) complexes
Desferrioxamine B models
Megjelenés:Inorganica Chimica Acta. - 357 : 9 (2004), p. 2451-2461. -
További szerzők:Buglyó Péter (1965-) (vegyész) Enyedy Éva Anna (1975-) (vegyész) Santos, Amelia M.
Pályázati támogatás:T034674
OTKA
TS 040685
OTKA
Internet cím:Szerző által megadott URL
DOI
Intézményi repozitóriumban (DEA) tárolt változat
Borító:
Rekordok letöltése1