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Titolo:
A new Fe-III (mu-OCH3)(2)(mu-OAc)Fe-III complex containing phenolate and imidazole ligands as a structural model for the active site of non-heme diiron enzymes
Autore:
Scarpellini, M; Neves, A; Bortoluzzi, AJ; Vencato, I; Drago, V; Ortiz, WA; Zucco, C;
Indirizzi:
Univ Fed Santa Catarina, Dept Quim, Lab Bioinorgan & Cristalog, BR-88040900 Florianopolis, SC, Brazil Univ Fed Santa Catarina Florianopolis SC Brazil BR-88040900 BC SC, Brazil Univ Fed Santa Catarina, Dept Fis, Lab Efeito Mossbauer, BR-88040900 Florianopolis, SC, Brazil Univ Fed Santa Catarina Florianopolis SC Brazil BR-88040900 BC SC, Brazil Univ Fed Sao Carlos, Grp Supercondutividade & Magnetismo, BR-13565900 Sao Carlos, SP, Brazil Univ Fed Sao Carlos Sao Carlos SP Brazil BR-13565900 BCCarlos, SP, Brazil Univ Fed Santa Catarina, Dept Quim, Lab Catalise & Mecanismos Reacoes Organ, BR-88040900 Florianopolis, SC, Brazil Univ Fed Santa Catarina Florianopolis SC Brazil BR-88040900 BC SC, Brazil
Titolo Testata:
JOURNAL OF THE CHEMICAL SOCIETY-DALTON TRANSACTIONS
fascicolo: 18, , anno: 2001,
pagine: 2616 - 2623
SICI:
1472-7773(20010921):18<2616:ANF(CC>2.0.ZU;2-M
Fonte:
ISI
Lingua:
ENG
Soggetto:
PURPLE ACID-PHOSPHATASE; BINUCLEAR IRON(III) COMPLEX; TRANSITION-METAL COMPLEXES; X-RAY STRUCTURE; CRYSTAL-STRUCTURE; MAGNETIC-PROPERTIES; BOVINE SPLEEN; (MU-OXO)DIIRON(III) COMPLEXES; METHANE MONOOXYGENASE; EXCHANGE INTERACTION;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Physical, Chemical & Earth Sciences
Citazioni:
60
Recensione:
Indirizzi per estratti:
Indirizzo: Neves, A Univ Fed Santa Catarina, Dept Quim, Lab Bioinorgan & Cristalog, BR-88040900 Florianopolis, SC, Brazil Univ Fed Santa Catarina FlorianopolisSC Brazil BR-88040900 BCil
Citazione:
M. Scarpellini et al., "A new Fe-III (mu-OCH3)(2)(mu-OAc)Fe-III complex containing phenolate and imidazole ligands as a structural model for the active site of non-heme diiron enzymes", J CHEM S DA, (18), 2001, pp. 2616-2623

Abstract

A new tridentate ligand [(2-hydroxybenzyl)(2-(imidazol-2-yl)ethyl)]amine (HBHA) and its first dinuclear Fe-III complex have been synthesized. The crystal structures of HBHA and of the complex [Fe-2(III)(BHA)(2)(mu -OCH3)(2)(mu -OAc)]- (ClO4) (1) have been solved by X-ray crystallography. In the cation of complex 1, each BHA(-) anion is arranged in a facial mode while one acetate and two methoxo groups as bridging ligands complete the coordination spheres of the Fe-III centres. The Fe-III ions are weakly antiferromagnetically coupled (J = -10.1 cm(-1)) and undergo a quasi-reversible one-electron redox process attributed to the Fe-2(III)/(FeFeIII)-Fe-II couple. Complex 1 also displays an intense phenolate-to-Fe-III charge transfer transitionat 517 nm (epsilon = 5560 dm(3) mol(-1) cm(-1)/Fe-2(III)). The Mossbauer spectrum of 1 at 115 K shows only one quadrupole doublet, with delta = 0.47 and DeltaE(Q) = 0.80 mm s(-1). A comparison of the structural, magnetic andspectroscopic properties of 1 and those detected in the Fe-2(III) form of purple acid phosphatases suggests that this compound is a potential structural model for the active site of these metalloenzymes. In addition, complex1 also mimics some structural features found in methane monooxygenase.

ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 02/04/20 alle ore 18:06:34