Title:	Molecular organization and molecular order of two rod-like smectogens in mesophases
Authors:	Boopathi, A. A. P. Lobo, Nitin Deo Mishra, Vishnu Roy, Arun Narasimhaswamy, T.
Keywords:	Smectic Biphenyl 13C NMR 13C-1H dipolar couplings Order parameter XRD
Issue Date:	28-Jun-2023
Publisher:	Taylor& Francis Group
Citation:	Liquid Crystals,2023
Abstract:	Structurally simple two rod-like mesogens with a three-ring core consisting of biphenyl and phenyl rings are synthesised to investigate the mesophase properties, molecular organisation and the orientational order parameter. In mesogen-1, a dodecyloxy terminal chain is present on the biphenyl ringwhile the phenyl ring is free from substituent. For mesogen-2, in addition to the dodecyloxy chain, the butyl chain is placed on the phenyl ring. The Hot-stage optical polarising microscopy (HOPM) and differential scanning calorimetry (DSC) measurements show smectic A (SmA), smectic B (SmB), and crystal E (CryE) phases for mesogen-1 and SmA, smectic C (SmC) and smectic F (SmF) phases for mesogen-2. The presence of smectic mesophases is established by X-ray Diffraction (XRD). 1D and 2D 13C solid-state NMR experiments are performed in smectic mesophases to find the orientational order parameters of the phenyl rings of the core. The main order parameter (Szz) of the mesogens in the SmB and SmF phase is in the range of 0.87–0.93. The excellent spectral resolution noticed in 13C NMR spectra in the SmB mesophase (mesogen-1) indicates that the internal rotations of the molecules along the long axis are primarily unhindered.
Description:	Restricted Access.
URI:	http://hdl.handle.net/2289/8206
ISSN:	1366-5855(online)
Alternative Location:	http://arxiv.org/abs/cond-mat/ https://doi.org/10.1080/02678292.2023.2227956
Copyright:	2023, The Publisher
Appears in Collections:	Research Papers (SCM)

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