Influence of Linking Group Orientation on Mesomorphism of Two Aromatic Ring Mesogens | Zendy

Lay-Khoon Ong | Zendy; Sie Tiong Ha | Zendy

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Influence of Linking Group Orientation on Mesomorphism of Two Aromatic Ring Mesogens

Author(s) -

Lay-Khoon Ong,

Sie Tiong Ha

Publication year - 2013

Publication title -

journal of chemistry

Language(s) - English

Resource type - Journals

SCImago Journal Rank - 0.436

H-Index - 50

eISSN - 2090-9063

pISSN - 2090-9071

DOI - 10.1155/2013/864819

Subject(s) - chemistry , ring (chemistry) , group (periodic table) , orientation (vector space) , stereochemistry , crystallography , organic chemistry , mathematics , geometry

A new homologous series of alkyl 4-{[(4-chlorophenyl)imino]methyl}benzoates were prepared, and all the members are differentiate by the alkoxy chain length, CnH2n+1O, where n=2–7, 9, 11, 13, 15. Their phase transition behaviors and mesophase characteristics were studied by differential scanning calorimetry (DSC) and optical polarizing microscopy techniques. DSC thermograms show direct isotropization and recrystallization during heating and cooling processes, respectively. The crystal phase changed directly to dark area textures (isotropic phase) without displaying any mesophase. The mesomorphic properties of compounds studied are strongly dependent on the orientation of the ester linkage. Reversed ester linkage has caused depression of mesomorphic property in the compounds studied

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