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Raman spectroscopic study of the molecular conformation of α‐octyl‐ω‐methoxyoligo(oxyethylene)s in the solid state
Author(s) -
Masatoki Sei,
Matsuura Hiroatsu,
Fukuhara Koichi
Publication year - 1994
Publication title -
journal of raman spectroscopy
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.748
H-Index - 110
eISSN - 1097-4555
pISSN - 0377-0486
DOI - 10.1002/jrs.1250250726
Subject(s) - raman spectroscopy , chemistry , solid state , crystallography , stereochemistry , optics , physics
The Raman spectra of α‐octyl‐ω‐methoxyoligo(oxyethylene)s, CH 3 (CH 2 ) 7 (OCH 2 CH 2 ) m OCH 3 ( m = 1–4), were measured in the solid state. The molecular conformation of these compounds was determined by a spectral analysis based on the key conformational bands. The conformation of the inner oxyethylene segments changes from an extended structure to a helical structure as the number of oxyethylene units increases. The difference in the conformational behaviour between the present methoxy‐ended compounds and the corresponding hydroxy‐ended compounds is associated with the different layer structures of the crystals.