Abstract
The molecular packing coefficients have been evaluated using the approach of Kitaigorodsky for some members of the series 4,4′-di-n-alkyloxyazoxybenzene. The packing coefficient increases as alkyl chain increases contrary to what is observed for cholesteryl alkanoates. This shows that packing coefficient is intimately related with thermodynamic parameter. These features can be qualitatively explained by considering a mechanical rigid rod model. In principle, this can be used to explain the observed changes in the gradient of S factors in symmetric (4,4′-di-n-alkyloxyazoxybenzene) and asymmetric (p-(p-ethoxyphenylazo) phenyl alkanoates) molecules. The S factor of asymmetric molecules drops off more rapidly than that of symmetric molecules which is in conformity with the packing coefficient calculations.
Keywords
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.
This is a preview of subscription content, log in via an institution.
Buying options
Tax calculation will be finalised at checkout
Purchases are for personal use only
Learn about institutional subscriptionsPreview
Unable to display preview. Download preview PDF.
References
J. Shashidhara Prasad, Mol. Cryst. Liq. Cryst. 47, 115 (1978).
W.R. Krigbaum, Y. Chatani and P.G. Barber, Acta Cryst. B26, 97 (1970).
A.J. Leadbetter and M.A. Mazid, Mol. Cryst. Liq. Cryst. 51, 85 (1979).
C.H. Carlisle and C.H. Smith, Acta Cryst. A25, S47 (1969).
P.K. Rajalakshṁi, N.C. Shivaprakash and J. Shashidhara Prasad, J. Appl. Cryst. 12, Pt. 3, 316 (1979).
N.C. Shivaprakash, P.K. Rajalakshmi and J. Shashidhara Prasad, Mol. Cryst. Liq. Cryst. 51, 317 (1979).
S.N. Prasad, S. Venugopalan and J. Billard, Mol. Cryst. Liq. Cryst. (Letters) 49, 271 (1979).
W.H. de Jeu and W.A.P. Claassen, J. Che. Phy. 68 (1), 102 (1978).
C.L. Watkins and C.S. Johnson Jr, J. Phys. Chem. 75 (16), 2452 (1971).
Author information
Authors and Affiliations
Editor information
Rights and permissions
Copyright information
© 1980 Springer-Verlag Berlin Heidelberg
About this paper
Cite this paper
Shivaprakash, N.C., Rajalakshmi, P.K., Prasad, J.S. (1980). Molecular Packing Coefficients of the Homologous Series 4,4′-Di-n-alkyloxyazoxybenzene. In: Helfrich, W., Heppke, G. (eds) Liquid Crystals of One- and Two-Dimensional Order. Springer Series in Chemical Physics, vol 11. Springer, Berlin, Heidelberg. https://doi.org/10.1007/978-3-642-67848-6_15
Download citation
DOI: https://doi.org/10.1007/978-3-642-67848-6_15
Publisher Name: Springer, Berlin, Heidelberg
Print ISBN: 978-3-642-67850-9
Online ISBN: 978-3-642-67848-6
eBook Packages: Springer Book Archive