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Titolo:
Dynamical transition and molecular motions in a channel-like inclusion compound under hydrostatic pressure
Autore:
Combet, J; Morelon, ND; Ferrand, M; Bee, M;
Indirizzi:
Inst Max Von Laue Paul Langevin, F-38042 Grenoble 9, France Inst Max Von Laue Paul Langevin Grenoble France 9 042 Grenoble 9, France Univ,Grenoble 1, Spectrometrie Phys Lab, UMR 5588, F-38402 St Martin Dheres Univ Grenoble 1 St Martin Dheres France F-38402 F-38402 St Martin Dheres
Titolo Testata:
PHYSICA B
fascicolo: 1-2, volume: 266, anno: 1999,
pagine: 56 - 59
SICI:
0921-4526(199905)266:1-2<56:DTAMMI>2.0.ZU;2-H
Fonte:
ISI
Lingua:
ENG
Soggetto:
ELASTIC NEUTRON-SCATTERING; ORGANIC MATRIX; CHAINS;
Keywords:
quasielastic neutron scattering; order-disorder transition; organic compounds; inclusion compounds; disordered materials; pressure;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Physical, Chemical & Earth Sciences
Citazioni:
8
Recensione:
Indirizzi per estratti:
Indirizzo: Combet, J Inst,Max Von Laue Paul Langevin, BP 156,Ave des Martyrs, F-38042Grenoble 9 Inst Max Von Laue Paul Langevin BP 156,Ave des Martyrs Grenoble France 9
Citazione:
J. Combet et al., "Dynamical transition and molecular motions in a channel-like inclusion compound under hydrostatic pressure", PHYSICA B, 266(1-2), 1999, pp. 56-59

Abstract

Tano molecules (C9H16NO2) form channel-like inclusion compounds with a great variety of linear hydrocarbons. At room temperature, both tano and included chains are dynamically disordered. Tano molecules can adopt one of their two enantiomeric forms by ring interconversion, and methyl reorientation occurs, Furthermore, the alkane chains perform reorientational motions around the channel axis. In the case of tano-octane adduct, a phase transition is observed at T = 180 K. In order to get a better understanding of the transition process we performed incoherent quasielastic neutron scattering experiments under pressure. The application of the pressure is responsible fora shift of the transition toward higher temperatures and allowed the observation of the molecular motion near the phase transition. It has been foundthat the transition process induces a variation of the occupancy factor ofthe tano molecules. This phenomena is followed by modifications of the dynamics of the octane chains suggesting important correlations between the two sublattices, (C) 1999 Elsevier Science B.V. All rights reserved.

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Documento generato il 05/07/20 alle ore 06:41:22