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Titolo:
NUCLEAR MAGNETIC-RELAXATION STUDY OF THE SYSTEM METHANOL WATER/LITHIUM CHLORIDE/
Autore:
ANSARI MS; LUDWIG R; ZEIDLER MD; HERTZ HG; POSCHL M;
Indirizzi:
RHEIN WESTFAL TH AACHEN,INST PHYS CHEM,TEMPLERGRABEN 59 D-52056 AACHEN GERMANY UNIV KARLSRUHE,INST PHYS CHEM D-76128 KARLSRUHE GERMANY QUAID I AZAM UNIV,DEPT CHEM ISLAMABAD PAKISTAN
Titolo Testata:
Zeitschrift für physikalische Chemie
, volume: 199, anno: 1997,
parte:, 1
pagine: 99 - 121
SICI:
0942-9352(1997)199:<99:NMSOTS>2.0.ZU;2-#
Fonte:
ISI
Lingua:
ENG
Soggetto:
CORRELATION-FUNCTION G2(T); MOLECULAR-MOTION; NMR RELAXATION; CONFORMATIONAL TRANSITIONS; WATER-DIMETHYLSULFOXIDE; TRANSLATIONAL MOTION; LIQUID ETHANOL; PROPANOL; MIXTURES; ROTATION;
Keywords:
NUCLEAR MAGNETIC RELAXATION; FLEXIBLE MOLECULE; HYDROGEN BONDING; ROTATIONAL MOTION; LIQUIDS;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Science Citation Index Expanded
Science Citation Index Expanded
Citazioni:
53
Recensione:
Indirizzi per estratti:
Citazione:
M.S. Ansari et al., "NUCLEAR MAGNETIC-RELAXATION STUDY OF THE SYSTEM METHANOL WATER/LITHIUM CHLORIDE/", Zeitschrift für physikalische Chemie, 199, 1997, pp. 99-121

Abstract

The magnetic relaxation times of the nuclei H-1, H-2, and C-13 forming the methyl group of methanol have been measured in the mixture 20 mol% methanol + 80 mol% water which also contained LiCl in various amounts (1.73, 7.3 and 14.5 (m) over bar). Measurements were partly performed at two frequencies and at variable temperatures so that at the lowest temperatures the relaxation maxima were passed. It turned out that in all cases the maximum relaxation rate was lower than expected making thus the conventional partial rigid body relaxation theory invalid. The proton and deuteron relaxation times of the solvent water + methanol-hydroxyl and the Li-7 relaxation times were also measured in the same temperature range. We obtained the result that the rotational correlation times of all solvent components (including LiCl) and the observed slow motion residuum in the fast motion of the methyl group are equal.

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Documento generato il 17/01/20 alle ore 20:15:24