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Titolo:
CONFIGURATIONAL PREFERENCES OF 2 1,2-DIAMINE ADDUCTS OF ENYL)-4,4,4-TRIFLUORO-1,3-BUTANEDIONATO)COBALT(II)
Autore:
TZAVELLAS LC; TSIAMIS C; KAVOUNIS CA; CARDIN CJ;
Indirizzi:
UNIV THESSALONIKI,DEPT CHEM GR-54006 THESSALONIKI GREECE UNIV THESSALONIKI,DEPT CHEM GR-54006 THESSALONIKI GREECE UNIV THESSALONIKI,DEPT PHYS GR-54006 THESSALONIKI GREECE UNIV READING READING RG2 6RD BERKS ENGLAND
Titolo Testata:
Inorganica Chimica Acta
fascicolo: 1, volume: 262, anno: 1997,
pagine: 53 - 59
SICI:
0020-1693(1997)262:1<53:CPO21A>2.0.ZU;2-Y
Fonte:
ISI
Lingua:
ENG
Soggetto:
COMPLEXES; LIGANDS; SPECTRA;
Keywords:
CRYSTAL STRUCTURES; COBALT COMPLEXES; DIAMINE COMPLEXES; DIONATO COMPLEXES;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Science Citation Index Expanded
Citazioni:
28
Recensione:
Indirizzi per estratti:
Citazione:
L.C. Tzavellas et al., "CONFIGURATIONAL PREFERENCES OF 2 1,2-DIAMINE ADDUCTS OF ENYL)-4,4,4-TRIFLUORO-1,3-BUTANEDIONATO)COBALT(II)", Inorganica Chimica Acta, 262(1), 1997, pp. 53-59

Abstract

The preparation, the IR and ligand field spectra and the structures of the mixed-ligand addition compounds [(N,N-dimethyl-1,2-diamino-ethane)bis( hienyl)-4,4,4-trifluoro-1,3-butanedionato)cobalt], [Co(thtf)(2)me(2)en], and [(N,N,N',N'-tetramethyl-1,2-diamino-ethane)bis( l)-4,4,4-trifluoro-1,3-butanedionato)colbalt(II)], [Co(thtf)(2)me(4)en], are reported. The structures were determined by single crystal X-ray diffraction analysis (monoclinic, space group P2(1)/c, Z=4 with a=10.708(6),b=19.531(6), c=13.352(6) Angstrom, beta = 111.64(10)degrees, R-1 = 0.0642 and R-w(2) = 0.1719 for [Co(thtf)(2)(me(2)en)] and a = 12.033(6),b = 15.565(6), c = 15.339(6) Angstrom, beta = 92.57(6)degrees, R-1 = 0.0612 and R-w(2)=0.1504 for [Co(thtf)(2)me(4)en]). The structures aredistorted octahedral and the shortest cobalt-cobalt separation distances are 5.388(2) Angstrom in [Co(thtf)(2)me(2)en] and 8.675(3) Angstrom in [Co(thtf)(2)me(4)en]. In both compounds the diamine molecules attain the gauche conformation. The U(Z,Z) conformation of the beta-dioneleads to a semi-chair conformation of the beta-dionato chelate rings. The relative orientation of the groups attached to the beta-dionato moiety depends on the extent of stereoelectronic effects the N-substitution of the diamine entails. In [Co(thtf)(2)me(2)en] the intraligand distance separating the trifluoromethyl carbon atoms is 5.281(18) Angstrom while in [Co(thtf)(2)me(2)en] it increases to 8.338(9) Angstrom. The cobalt-cobalt separation distance, the orientation of the chelate rings and the extent of N-substitution seem to affect hydrogen bonding. While in [Co(thtf)(2)me(2)en] inter- and intraligand hydrogen bondingis implicated, it is totally absent in [Co(thtf)(2)me(4)en].

ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 24/11/20 alle ore 14:43:52