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Titolo:
REACTIVITY OF PYRROLE PIGMENTS .21. STRUCTURE AND REACTIVITY OF CU(II) AND ZN(II) BILINDIONE CHELATES
Autore:
JAUMA A; ESCUER A; FARRERA JA; RIBO JM;
Indirizzi:
UNIV BARCELONA,DEPT QUIM ORGAN E-08028 BARCELONA SPAIN UNIV BARCELONA,DEPT QUIM ORGAN E-08028 BARCELONA SPAIN UNIV BARCELONA,DEPT QUIM INORGAN E-08028 BARCELONA SPAIN
Titolo Testata:
Monatshefte fuer Chemie
fascicolo: 10, volume: 127, anno: 1996,
pagine: 1051 - 1062
SICI:
0026-9247(1996)127:10<1051:ROPP.S>2.0.ZU;2-M
Fonte:
ISI
Lingua:
ENG
Soggetto:
PI-CATION RADICALS; MOLECULAR-STRUCTURE; BILE-PIGMENTS; BILIVERDIN; OXIDATION; COMPLEX; OCTAETHYLBILINDIONE; COPPER(II); PORPHYRINS; LIGANDS;
Keywords:
BILE PIGMENTS; TRANSITION METAL BILINDIONE CHELATES; D-PI ORBITALS INTERACTION; METALLOPORPHYRIN PI CATION RADICAL; BILINDIONE PI NEUTRAL RADICAL;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Science Citation Index Expanded
Citazioni:
33
Recensione:
Indirizzi per estratti:
Citazione:
A. Jauma et al., "REACTIVITY OF PYRROLE PIGMENTS .21. STRUCTURE AND REACTIVITY OF CU(II) AND ZN(II) BILINDIONE CHELATES", Monatshefte fuer Chemie, 127(10), 1996, pp. 1051-1062

Abstract

Several Mn, Cu, and Zn chelates of etiobiliverdin-IV-gamma, mesobiliverdin-IX alpha, and its dimethyl ester are studied. The results show that the chemical constitution of the Cu biliverdin chelate correspondsto a formal metal oxidation state of (II) coordinated to a neutral radical of the NH trideprotonated biliverdin. The reactivity of the Cu(II) bilindione chelates in nucleophilic solvents agrees with that expected for a pi neutral radical structure of the ligand; in CH3OH, they undergo oxidation towards dimethoxybilipurpurins. The magnetic behaviour of Cu(II) etiobiliverdinate-IV-gamma in the solid state shows an intramolecular weak antiferromagnetic coupling d(9)Cu-to-pi-radical (J = -23 cm(-1)) and an intermolecular weak antiferromagnetic coupling pi-radical-to-pi-radical (J = -45 cm(-1)). The analogy of this magnetic behaviour to that of the pi cation radical of metalloporphyrins is discussed.

ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 01/10/20 alle ore 00:39:01