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Pairwise energy effect of cyclic conjugation in benzo-annelated perylenes. MONATSHEFTE FUR CHEMIE 2010. [DOI: 10.1007/s00706-010-0270-z] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 10/19/2022]
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Abstract
Melting mechanisms have been studied for diphenyl, and
o
-,
m
- and
p
-terphenyl. The
volume increase on melting
is largest for the linear polyphenyls and smallest for branched molecules which can interlock in the melt. In no case will the volume increase permit the ‘onset of rotation’ on melting.
Viscosity measurements
give marked indications of the growth of cybotactic groups in the melts on approaching the freezing-points, especially in the case of
o
-terphenyl, where the , ratio
H
vap
/
E
n
reaches exceptionally low values near the freezing-point. Plots of
fluidity against specific volume
and the marked tendency of the melt of
o-
terphenyl to supercool give further indications of the presence of interlocked groups of molecules in the melt.
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Reactivity Indices in Conjugated Molecules: The Present Position. ADVANCES IN PHYSICAL ORGANIC CHEMISTRY 1966. [DOI: 10.1016/s0065-3160(08)60353-6] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register]
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