Schiff base liquid crystals with terminal iodo group: Synthesis and thermotropic properties

Scientific Research and Essays

Sie-Tiong Ha¹ 

关键词:  ;    4-{[(4-iodophenyl) imino] methyl} phenyl alkanoate;    thermotropic properties;    smectic A;    smectic B;    polarizability.;   

DOI  :  10.5897/SRE11.1131

学科分类：社会科学、人文和艺术（综合）

来源: Academic Journals

【 摘 要 】

A new homologous series of Schiff base esters comprising a terminal iodo substituent was studied. The iodo substituent contributes to the molecular polarizability, thus, affecting intermolecular interactions, hence, resulting in smectic polymorphism. The mesomorphic properties were studied using differential scanning calorimeter (DSC) and polarizing optical microscope (POM). Whilst the lower members,n-ethanoyloxy,n-propanoyloxy,n-butanoyloxy andn-pentanoyloxy derivatives were non-mesogens, enantiotropic smectogenic A phase was observed in the medium members (n-hexyloxy andn-heptanoyloxy derivatives). Further lengthening of the alkyl chain from C8 to C18 members saw the induction of new phase which was identified as smectic B phase under microscope. The homologous members were compared with structurally related series to establish their chemical structure-mesomorphic behavior relationships.

【 授权许可】

CC BY