Catalogo Articoli (Spogli Riviste)

OPAC HELP

Titolo:
THE 2ND EXAMPLE OF SPIN CONVERSION GOVERNED BY MOLECULAR VIBRATIONS -A NOVEL FERROUS COMPLEX RESULTING FROM HEXACOORDINATION OF A SCHIFF-BASE WITH AN N4O2 DONOR SET
Autore:
BOUSSEKSOU A; SALMON L; VARRET F; TUCHAGUES JP;
Indirizzi:
UNIV TOULOUSE 3,CNRS,CHIM COORDINAT LAB,UNITE LIEE CONVENT 8241,205 ROUTE DE NARBONNE F-31077 TOULOUSE FRANCE INST NATL POLYTECH TOULOUSE F-31077 TOULOUSE FRANCE UNIV VERSAILLES,CNRS,URA 1531,LAB MAGNETISME & OPT F-78035 VERSAILLESFRANCE
Titolo Testata:
Chemical physics letters
fascicolo: 2, volume: 282, anno: 1998,
pagine: 209 - 214
SICI:
0009-2614(1998)282:2<209:T2EOSC>2.0.ZU;2-B
Fonte:
ISI
Lingua:
ENG
Soggetto:
ISING-LIKE MODEL; MOSSBAUER-SPECTROSCOPY; CROSSOVER; FE-II(5-NO2-SAL-N(1,4,7,10)); FE(PHEN)2(NCSE)2; TRANSITION; IRON(II);
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Science Citation Index Expanded
Citazioni:
24
Recensione:
Indirizzi per estratti:
Citazione:
A. Bousseksou et al., "THE 2ND EXAMPLE OF SPIN CONVERSION GOVERNED BY MOLECULAR VIBRATIONS -A NOVEL FERROUS COMPLEX RESULTING FROM HEXACOORDINATION OF A SCHIFF-BASE WITH AN N4O2 DONOR SET", Chemical physics letters, 282(2), 1998, pp. 209-214

Abstract

The crystal structure of [Fe-II(3-MeO,5-NO2-sal-N(1,10)-NMe(4,7))] (2) is identical to that of [Fe-II(5-NO2-sal-N(1,4,7,10))] (1), except for substitution of two strong N-H ... O(nitro) bonds (1) by one weak N-C-H ... O(nitro) contact (2) between adjacent molecules along the 1D chains. Unlike 1 (two-step spin-state transition), 2 experiences an incomplete (17%) and progressive (70-240 K) spin-state conversion (Mossbauer and magnetic studies). A theoretical approach based on the Ising-like model, completed with harmonic oscillators associated with the 15vibrational modes of the coordination octahedron, fits the thermal variation of the high-spin (HS) fraction with a 2303 K energy gap between the lowest low spin (LS) and HS electrovibrational states, an average vibrational frequency omega(LS) = 725 K and an average omega(LS)/omega(HS) = 1.724 ratio. These results illustrate the effect of intramolecular vibrations spin-state conversions. (C) 1998 Elsevier Science B.V.

ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 04/12/20 alle ore 02:35:26