Electron transfer in mixed-valence materials

Informazioni relative al progetto

ID dell’accordo di sovvenzione: INTAS-94-2496

Progetto chiuso

Data di avvio 1 Aprile 1995

Data di completamento 31 Marzo 1998

Finanziato da

• International Association for the promotion of cooperation with scientists from the independent states of the former Soviet Union (INTAS), 1993-

Costo totale

Nessun dato

Contributo UE

€ 53 700,00

Coordinato da

University of East Anglia
United Kingdom

CORDIS fornisce collegamenti ai risultati finali pubblici e alle pubblicazioni dei progetti ORIZZONTE.

I link ai risultati e alle pubblicazioni dei progetti del 7° PQ, così come i link ad alcuni tipi di risultati specifici come dataset e software, sono recuperati dinamicamente da .OpenAIRE .

Risultati sfruttabili

Electron transfer in mixed-valence materials

Trinuclear cluster complexes of the general types [M3O(OOCMe3)6(py)3]n+ (M = Cr, Fe, Mn) and [M3X(SO4)6(H2O)3]n+ (M = Ir, Os; X = N, O) have been prepared. Electrokinetic studies have been completed. Theoretical studies on vibrational coupling in Jahn-Teller magnetic materials have continued. It has been shown that internal and external mobility of electrons in mixed-valence polynuclear couples are correlated, in the sense that (1) for a tririon (III, III, II) cluster, the mixed-valence character is close to the borderline of Robin-Day classes I and III, and electron transfer to and from electrodes and other one-electron reagents is fast, while (2) for analogous manganese (III, III, II) complexes, the mixed-valence character is close to the class I, and electron transfer is slow under a similar range of conditions. New magnetic data have given quantitative support to the model of a magnetic Jahn-Teller effect. First-row "fully oxidised" iron (III, III, III) and chromium (III, III, III, trimers have been found to show symmetry lowering at low temperatures, and the nature of the crystal lattice is such that it is unlikely that the molecular symmetry lowering is imposed by external packing forces.