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Liquid Crystals Volume 31, 2004 - Issue 7
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Original Articles

The effect of terminal chain modifications on the mesomorphic properties of 4,4′-disubstituted diphenyldiacetylenes

Mary E. Neubert Corresponding author Glenn H. Brown Liquid Crystal Intitute, Kent State University, Kent, OH 44242-0001, USA
,
Michael R. Fisch Glenn H. Brown Liquid Crystal Intitute, Kent State University, Kent, OH 44242-0001, USA
,
Sandra S. Keast Glenn H. Brown Liquid Crystal Intitute, Kent State University, Kent, OH 44242-0001, USA
,
Julie M. Kim Glenn H. Brown Liquid Crystal Intitute, Kent State University, Kent, OH 44242-0001, USA
,
Mark C. Lohman Glenn H. Brown Liquid Crystal Intitute, Kent State University, Kent, OH 44242-0001, USA
,
Rachel S. Murray Glenn H. Brown Liquid Crystal Intitute, Kent State University, Kent, OH 44242-0001, USA
,
Kyle J. Miller Glenn H. Brown Liquid Crystal Intitute, Kent State University, Kent, OH 44242-0001, USA
,
Raj A. Shenoy Glenn H. Brown Liquid Crystal Intitute, Kent State University, Kent, OH 44242-0001, USA
,
Michael J. Smith Glenn H. Brown Liquid Crystal Intitute, Kent State University, Kent, OH 44242-0001, USA
,
Ryan M. Stayshich Glenn H. Brown Liquid Crystal Intitute, Kent State University, Kent, OH 44242-0001, USA
,
Margaret E. Walsh Glenn H. Brown Liquid Crystal Intitute, Kent State University, Kent, OH 44242-0001, USA
,
Rolfe G. Petschek Physics Department, Case Western Reserve University, Cleveland, OH 44106-7079, USA
,
George A. Lorenzo Chemistry Department, Wheaton College, Wheaton, IL 60187-5593, USA
,
Dena C. Burrows Chemistry Department, Wheaton College, Wheaton, IL 60187-5593, USA
&
Shelly M. Oliver Chemistry Department, Wheaton College, Wheaton, IL 60187-5593, USA
 show all
Pages 941-963 | Received 06 Oct 2003, Accepted 07 Dec 2003, Published online: 29 Sep 2011
 
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Abstract

A variety of terminal chain modifications (Y) were made on the diacetylenes in which X=C n H2n+1, C12H25O and F, and Y=CH2CH(Me)C2H5, COCH3, C≡CC5H11, C n F2n+1 C n H2n+1 and CH=CHCO2C3H7. Mesomorphic properties were determined by hot stage polarizing microscopy and DSC. These were compared with those for the dialkyl analogues (X=C m H2 m +1, Y=C n H2 n +1) and a series of 1- and 2-olefins (Y=CH=CHC n H2 n +1 and CH2CH=CHC n H2 n +1). The 1-olefin series showed wider range nematics than the dialkyl compounds, whereas the above modifications showed either narrow range nematic phases, no mesophase or higher melting temperatures. New transition temperature and enthalpy data are provided for some of the dialkyl and F-alkyl compounds previously reported, for comparisons. Preliminary birefringence data are also included along with the results of some heat and UV stability studies.

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