The Fusion of Di-Substituted Benzines
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Authors
Martin, Eric
Issue Date
1978
Type
Thesis
Language
en_US
Keywords
Alternative Title
Abstract
The entropy of fusion of a homologus series of di-substituted benzene
compounds was shown by multiple linear regression to be approximately constant,
with a mean value of 12.7 e.u. and a standard deviation of less than 2.0 e.u.
The series of compounds were selected to emphasize molecular interactions, and
to minimize differences in geometry. These results disagreed with Bondi1s
prediction. He suggested that strong molecular dipoles and hydrogen bonding
would restrict free rotation of the molecules in the liquid, decreasing the
gains in orientational freedom on melting, which would result in a decrease in
the entropy of fusion. The fact that these results Were not observed was attributed to corresponding restrictions of the torsional vibrations in
the crystals. This is believed to compensate for the association in the
liquid, so that the ratios of molecular freedom between the crystal and
the melt remain the same.
Description
iv, 43 p.
Citation
Publisher
Kalamazoo College
License
U.S. copyright laws protect this material. Commercial use or distribution of this material is not permitted without prior written permission of the copyright holder. All rights reserved.