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Titolo:
Iron(III) complexation behavior of benzene-centered tripodal mono-, di- and tritopic ligands carrying a repeating -Ahe-(HO)Apr- sequence [Ahe=6-aminohexanoyl; (HO)Apr=3-(N-hydroxy)aminopropanoyl]
Autore:
Tsubouchi, A; Shen, LT; Hara, Y; Akiyama, M;
Indirizzi:
Tokyo Univ Agr & Technol, Dept Appl Chem, Tokyo 1848588, Japan Tokyo Univ Agr & Technol Tokyo Japan 1848588 Chem, Tokyo 1848588, Japan
Titolo Testata:
NEW JOURNAL OF CHEMISTRY
fascicolo: 2, volume: 25, anno: 2001,
pagine: 275 - 282
SICI:
1144-0546(2001)25:2<275:ICBOBT>2.0.ZU;2-0
Fonte:
ISI
Lingua:
ENG
Soggetto:
MICROBIAL IRON TRANSPORT; N-HYDROXY AMIDES; COORDINATION CHEMISTRY; FERRIOXAMINE-E; SIDEROPHORES; MECHANISM; MODELS; KINETICS; EXCHANGE; PEPTIDES;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Physical, Chemical & Earth Sciences
Citazioni:
41
Recensione:
Indirizzi per estratti:
Indirizzo: Akiyama, M Tokyo Univ Agr & Technol, Dept Appl Chem, Tokyo 1848588, Japan Tokyo Univ Agr & Technol Tokyo Japan 1848588 o 1848588, Japan
Citazione:
A. Tsubouchi et al., "Iron(III) complexation behavior of benzene-centered tripodal mono-, di- and tritopic ligands carrying a repeating -Ahe-(HO)Apr- sequence [Ahe=6-aminohexanoyl; (HO)Apr=3-(N-hydroxy)aminopropanoyl]", NEW J CHEM, 25(2), 2001, pp. 275-282

Abstract

To investigate how three-directional molecules behave upon complexation with ferric iron, tripodal 1,3,5-benzene-centered mono-, di- and tritopic iron-chelating ligands {C6H3[CO-(Ahe-(HO)Apr)(n)-OH](3): 1, n=1; 2, n=2; 3, n=3}, composed of strands containing an -Ahe-(HO)Apr- sequence [Ahe=6-aminohexanoyl; (HO)Apr=3-(N-hydroxy)aminopropanoyl], were synthesized. These hydroxamate ligands form intramolecular six-coordinate octahedral complexes withFe(iii): Fe-1-1, Fe-1-2, Fe-2-2, Fe-1-3, Fe-2-3 and Fe-3-3. The complexes formed were investigated from a topological viewpoint and examined in termsof stability against attack by H+ and HO-, monoprotonation equilibrium andiron removal kinetics using a 20-molar excess of EDTA. Fe-1-1, Fe-1-2 and Fe-2-2 have tripodal interstrand structures. In particular, the iron removal reaction of Fe-2-2 shows a consecutive first-order reaction pattern. Fromkinetic data of the first-order reactions, Fe-1-3, Fe-2-3 and Fe-3-3 are concluded to possess one, two and three discrete ferrioxamine-type (intrastrand) structures, respectively.

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Documento generato il 19/09/20 alle ore 20:55:25