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Orthogonal smectic and nematic ordering in three-ring polar bent-core molecules with anti-parallel arrangement

Abstract

We report the basic structural understanding of a new class of achiral three-ring bent-core compounds with an imine and ester linkage at the molecular bend, which are shown to exhibit nematic and orthogonal smectic phases at lower temperature. The occurrence of the orthogonal smectic and nematic ordering has been confirmed by optical texture, DSC study and temperature dependent X-ray diffraction measurement. X-ray structure analysis in the crystalline state of one of the compound 2-4 ascertained the antiparallel arrangement of the polar bent-core molecules in the unit cell. A stretched bent angle (~ 143°) which is due to the presence of methyl group at the molecular kink has also been demonstrated. Moreover the interdigitated arrangement of the pre-mesogenic Schiff’s base compound SB-C8 has been determined by SCXRD analysis. The presence of permanent dipole moment along the lateral direction of these series of compounds, determined by DFT calculation, induces polarity in the mesophase. We have successfully revealed that the bent-core compounds based on three-ring system exhibit enhanced monolayer smectic A as well as low temperature nematic ordering upon super-cooling.

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Publication details

The article was received on 22 Jan 2017, accepted on 12 May 2017 and first published on 16 May 2017


Article type: Paper
DOI: 10.1039/C7NJ00272F
Citation: New J. Chem., 2017, Accepted Manuscript
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    Orthogonal smectic and nematic ordering in three-ring polar bent-core molecules with anti-parallel arrangement

    S. K. Pal, S. Kaur, V. Punjani and G. Mohiuddin, New J. Chem., 2017, Accepted Manuscript , DOI: 10.1039/C7NJ00272F

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