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Titolo:
A high pressure FT-IR spectroscopic study of phase transitions in 1-chloro- and 1-bromoadamantane
Autore:
Fraczyk, LA; Huang, YN;
Indirizzi:
Univ Western Ontario, Dept Chem, London, ON N6A 5B7, Canada Univ Western Ontario London ON Canada N6A 5B7 London, ON N6A 5B7, Canada
Titolo Testata:
SPECTROCHIMICA ACTA PART A-MOLECULAR AND BIOMOLECULAR SPECTROSCOPY
fascicolo: 5, volume: 57, anno: 2001,
pagine: 1061 - 1071
SICI:
1386-1425(200104)57:5<1061:AHPFSS>2.0.ZU;2-D
Fonte:
ISI
Lingua:
ENG
Soggetto:
SPIN-LATTICE RELAXATION; MOLECULAR REORIENTATIONS; 1-CHLOROADAMANTANE; MOTION;
Keywords:
1-chloroadamantane; 1-bromoadamantane; high-pressure; phase transition; infrared spectroscopy; diamond anvil cell;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Physical, Chemical & Earth Sciences
Citazioni:
16
Recensione:
Indirizzi per estratti:
Indirizzo: Huang, YN Univ Western Ontario, Dept Chem, London, ON N6A 5B7, Canada UnivWestern Ontario London ON Canada N6A 5B7 N N6A 5B7, Canada
Citazione:
L.A. Fraczyk e Y.N. Huang, "A high pressure FT-IR spectroscopic study of phase transitions in 1-chloro- and 1-bromoadamantane", SPECT ACT A, 57(5), 2001, pp. 1061-1071

Abstract

The infrared spectra of two orientationally disordered adamantane derivatives, 1-chloro- and 1-bromoadamantane, have been obtained as a function of pressure by use of a diamond anvil cell. Phase transitions were detected from the splittings of vibrational bands and from changes in the slopes on plots of frequency versus pressure. In 1-chloroadamantane, a disorder-order phase transition was detected at approximately 5 kbar. This high-pressure phase is identical to the ordered phase obtained at low temperature. A second phase transition at high pressure was identified, for the first time, at approximately 17 kbar. The new high-pressure phase is an ordered phase. For 1-bromoadamantane, a semi-ordered to ordered phase transition was detected at about 5 kbar, and no other transitions were observed up to a pressure of 35 kbar. For both derivatives, the phase changes were reversible. (C) 2001 Elsevier Science B.V. All rights reserved.

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Documento generato il 05/07/20 alle ore 10:02:58