Study on the molecular orientation of an anti-ferroelectric liquid crystal by two-dimensional correlation polarized infrared spectroscopy

Polarization-dependent infrared spectra of an antiferroelectric liquid crystal in the phase were measured at 60°C, for investigation of the relative orientation of the terminal alkyl chain and mesogen. The polarization angle-dependent infrared spectra obtained were analysed by two-dimensional (2D) correlation spectroscopy. The orientation of the mesogen segment and the alkyl chains in the Study on the molecular orientation of an anti-ferroelectric liquid crystal by two-dimensional correlation polarized infrared spectroscopy All authorsYuchuan Cheng, Weiqing Xu, Xu Wang, Li Sun & Bing Zhao Corresponding authorhttps://doi.org/10.1080/02678290412331293431Published online:19 May 2010Display full size Study on the molecular orientation of an anti-ferroelectric liquid crystal by two-dimensional correlation polarized infrared spectroscopy All authorsYuchuan Cheng, Weiqing Xu, Xu Wang, Li Sun & Bing Zhao Corresponding authorhttps://doi.org/10.1080/02678290412331293431Published online:19 May 2010Display full size Study on the molecular orientation of an anti-ferroelectric liquid crystal by two-dimensional correlation polarized infrared spectroscopy All authorsYuchuan Cheng, Weiqing Xu, Xu Wang, Li Sun & Bing Zhao Corresponding authorhttps://doi.org/10.1080/02678290412331293431Published online:19 May 2010Display full size Study on the molecular orientation of an anti-ferroelectric liquid crystal by two-dimensional correlation polarized infrared spectroscopy All authorsYuchuan Cheng, Weiqing Xu, Xu Wang, Li Sun & Bing Zhao Corresponding authorhttps://doi.org/10.1080/02678290412331293431Published online:19 May 2010Display full size Study on the molecular orientation of an anti-ferroelectric liquid crystal by two-dimensional correlation polarized infrared spectroscopy All authorsYuchuan Cheng, Weiqing Xu, Xu Wang, Li Sun & Bing Zhao Corresponding authorhttps://doi.org/10.1080/02678290412331293431Published online:19 May 2010Display full size Study on the molecular orientation of an anti-ferroelectric liquid crystal by two-dimensional correlation polarized infrared spectroscopy All authorsYuchuan Cheng, Weiqing Xu, Xu Wang, Li Sun & Bing Zhao Corresponding authorhttps://doi.org/10.1080/02678290412331293431Published online:19 May 2010Display full size Study on the molecular orientation of an anti-ferroelectric liquid crystal by two-dimensional correlation polarized infrared spectroscopy All authorsYuchuan Cheng, Weiqing Xu, Xu Wang, Li Sun & Bing Zhao Corresponding authorhttps://doi.org/10.1080/02678290412331293431Published online:19 May 2010Display full size phase is similar to that in the SmC* phase. Four new CH3 and CH2 stretching modes were observed from the 2D correlation spectra. From these we can clearly separate the vibrational mode for two hydrocarbon chains and conclude that the orientations of the two chains are different. The C=O group adjacent to the chiral segment is also separated by 2D correlation spectra into two bands, which may arise from either the C=O group hydrogen-bonded with the phenyl ring, or from another rotational conformation of the molecule.