CC and CO bond conformations in 1,2-dimethoxyethane, bis-(2-methoxyethyl)ether and poly(ethyleneoxide): dependence on solvent and temperature

Data from 3 J HCCH and 3 J HCOC couplings in 1,2-dimethoxyethane and bis-(2-methoxyethyl)ether, plus 3 J HCCH in poly(ethylene oxide), have been obtained in five solvents by iterative fitting. The resulting proportions of gauche rotamers are higher than previous estimates, and higher still after all...

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Bibliographic Details
Published in:Polymer (Guilford) 1997, Vol.38 (2), p.355-359
Main Authors: Howarth, Oliver W., Michael, Michael, Ibbett, Roger N.
Format: Article
Language:English
Subjects:
Applied sciences
conformation
dimethoxyethane
Exact sciences and technology
Organic polymers
Physicochemistry of polymers
poly(ethylene oxide)
Properties and characterization
Solution and gel properties
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Summary:Data from 3 J HCCH and 3 J HCOC couplings in 1,2-dimethoxyethane and bis-(2-methoxyethyl)ether, plus 3 J HCCH in poly(ethylene oxide), have been obtained in five solvents by iterative fitting. The resulting proportions of gauche rotamers are higher than previous estimates, and higher still after allowance is made for the pentane effect. They fit well with gas phase electron diffraction data, with current gas phase theoretical calculations and with standard RIS parameters for the polymer, but less well with calculations for the liquid state. The influence of solvent arises more from variations in its H-bond donor properties than in its dielectric.
ISSN:0032-3861
1873-2291
DOI:10.1016/S0032-3861(96)00497-1