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Abstract
A variety of terminal chain modifications were made by placing/removing the electro-negative oxygen atom to either or both sides of the rigid core of the benzylidene aniline compounds, the chosen alkyl chain lengths were n = 5 and m = 16. The mesomorphic properties were determined by polarizing thermal microscopy (TM) and differential scanning calorimetry (DSC). They exhibit two mono-variant and two di-variant phase sequences. The results are discussed in light of the depression in melting temperature, elevation of clearing temperature, and quenching of liquid-crystalline phases as a function of influence of oxygen with the end alkyl chain length.
Acknowledgment
The financial support rendered by the Council of Scientific & Industrial Research (CSIR), Department of Sciences & Technology (DST), University Grants Commission (UGC), New Delhi, and Department of Atomic Energy-Board of Research in Nuclear Sciences (DAE-BRNS), Mumbai, India, is gratefully acknowledged.
Notes
a Peaks are not well resolved.
The blank space indicates the compound yet to be reported.