Abstract
The effect of halogen substitution on thermotropic liquid crystalline materials has a significant impact on many physical and chemical properties. Replacement of hydrogen atom by one of halogen can change and tune many important parameters such as dielectric anisotropy, viscosity, clearing and melting points, type and range of liquid crystalline phase and many others. Steric effect of halogen atoms and their polarity are two of the most important parameters, which have significant input to liquid crystalline properties. This work shows the correlation between the position of small size polar substituents (chlorine and fluorine atoms), their number and length of terminal alkyl chains (where alkyl chains are from ethyl to pentyl) on mesomorphic properties of twelve homologous series of terphenyl derivatives. Correlations for investigated compounds are supported by computational analysis of molecular polarizabilities, torsion angles between benzene rings and dipole moments. This work may be helpful for planning new structures of liquid crystalline compounds with predicted mesomorphism. Synthesized compounds show a strong tendency to form highly ordered smectic phases, while nematic phase is observed only for eleven compounds.
Sign-in/Register to access full text options 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
