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Infrared spectroscopy and conformation of alkyl vinyl ketone monomer
Author(s) -
Kinoshita Akihiro,
Naito Ikuo,
Namariyama Yoichi
Publication year - 1983
Publication title -
journal of applied polymer science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.575
H-Index - 166
eISSN - 1097-4628
pISSN - 0021-8995
DOI - 10.1002/app.1983.070281009
Subject(s) - alkyl , monomer , ketone , chemistry , double bond , absorption spectroscopy , infrared spectroscopy , absorption (acoustics) , crystallography , spectroscopy , polymer chemistry , stereochemistry , materials science , organic chemistry , polymer , physics , quantum mechanics , composite material
The correlation between IR spectra and conformations was examined in alkyl vinyl ketone monomer. The stretching absorption bands of double bonds shift to lower wave number with the decrease in Taft's σ * values of alkyl groups, and, conversely, the deformation band of the vinyl group shifts to the higher wave number. The inductive effect of the alkyl group is aparently three times larger in s‐cis conformation than that in the s‐trans. Absorption coefficients in the double‐bond stretchings ( A CO and A CC) were measured in each conformation. Both conformations have a nearly equal value of A CO. The ratio ( A s‐cis/ A s‐trans) CC is 3.4 ±1.0. The ratios ( A′ CO/ A′ CC) are 4.5 ±0.6 for the s‐cis conformation and 15±2 for the s‐trans conformation in all alkyl vinyl ketones studied.