Accession Number : AD0710856

Title :   WEAK INTERMOLECULAR INTERACTION OF OH GROUPS. AN INFRARED STUDY OF PHENOL AND 2,6-DIISOPROPYL PHENOL,

Corporate Author : NATIONAL RESEARCH COUNCIL OF CANADA HALIFAX (NOVA SCOTIA) ATLANTIC REGIONAL LAB

Personal Author(s) : Szczepaniak,Krystyna ; Falk,Michael

Report Date : 30 JUN 1969

Pagination or Media Count : 13

Abstract : Profiles of OH stretching bands of phenol and 2,6-diisopropyl phenol in a variety of weakly polar solvents were studied as a function of temperature. The profiles reflect the continuous distribution of OH solvent interactions. Increase of temperature shifts this distribution toward weaker interactions. In many solvents two distinct maxima are observed. These can be assigned to interactions of the OH group with different parts of the surface of the solvent molecule, e.g. pi electrons or CH3 groups. Comparison of the spectra of phenols with undeuterated OH groups and those with partially deuterated OH groups shows that the broad OH bands in the undeuterated liquid largely reflect the continuum of interactions, while those in the undeuterated crystal are mainly determined by vibrational coupling. Because of steric hindrance, the OH group of 2,6-diisopropyl phenol interacts less strongly with solvent molecules than that of phenol. In the crystalline state, however, the two phenols form hydrogen bonds of about the same strength. Spectra of both phenols in the vapor phase were also recorded. (Author)

Descriptors :   (*PHENOLS, *INFRARED SPECTRA), (*MOLECULAR ASSOCIATION, PHENOLS), ORGANIC SOLVENTS, TEMPERATURE, CANADA

Subject Categories : Organic Chemistry
      Atomic and Molecular Physics and Spectroscopy

Distribution Statement : APPROVED FOR PUBLIC RELEASE