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Titolo:
X-RAY-ABSORPTION FINE-STRUCTURE STUDY OF THE STRUCTURAL-CHANGES ACCOMPANYING SPIN CROSS-OVER IN THE ACETONE SOLVATES OF [FE(DPPEN)(2)X(2)] [DPPEN=CIS-1,2-BIS(DIPHENYLPHOSPHINO)ETHYLENE - X=CL OR BR]
Autore:
YOUNG NA;
Indirizzi:
UNIV HULL,SCH CHEM KINGSTON HULL HU6 7RX N HUMBERSIDE ENGLAND
Titolo Testata:
Journal of the Chemical Society. Dalton transactions
fascicolo: 7, , anno: 1996,
pagine: 1275 - 1281
SICI:
0300-9246(1996):7<1275:XFSOTS>2.0.ZU;2-5
Fonte:
ISI
Lingua:
ENG
Soggetto:
6-COORDINATE COBALT(II) COMPLEXES; CURVED-WAVE THEORY; IRON(II) COMPLEXES; K-EDGE; ELECTRONIC-STRUCTURE; MOLECULAR-COMPLEXES; EXAFS CALCULATIONS; STATE TRANSITION; SPECTROSCOPY; FE(PHEN)2(NCS)2;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Science Citation Index Expanded
Citazioni:
67
Recensione:
Indirizzi per estratti:
Citazione:
N.A. Young, "X-RAY-ABSORPTION FINE-STRUCTURE STUDY OF THE STRUCTURAL-CHANGES ACCOMPANYING SPIN CROSS-OVER IN THE ACETONE SOLVATES OF [FE(DPPEN)(2)X(2)] [DPPEN=CIS-1,2-BIS(DIPHENYLPHOSPHINO)ETHYLENE - X=CL OR BR]", Journal of the Chemical Society. Dalton transactions, (7), 1996, pp. 1275-1281

Abstract

Iron and bromine K-edge X-ray absorption fine structure (XAFS) have been used to determine the changes in the local iron environment in [Fe(dppen)(2)Br-2]. 2Me(2)CO on going through the spin cross-over transition at 160-185 K. The mean Fe-P bond length decreases from the high- to the low-spin isomer by 0.29 Angstrom [2.60(3) to 2.31(3) Angstrom]; whereas the mean Fe-Br bond length decreases by only ca. 0.02 Angstrom[2.51(3); to 2.48(3), iron K-edge; 2.48(3) to 2.47(3) Angstrom, bromine K-edge]. Iron K-edge XAFS for [Fe(dppen)(2)Cl-2]. 2Me(2)CO showed areduction of 0.28 Angstrom in the mean Fe-P distance [2.55(3) to 2.27(3) Angstrom] and a reduction of 0.02 Angstrom in the mean Fe-Cl bond length [2.33(3) to 2.31(3) Angstrom] on going from the high- to the low-spin form, in good agreement with literature values,:the spin transition being observed at 220-240 K.

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Documento generato il 28/11/20 alle ore 15:19:31