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Raman and fluorescence spectroscopies were employed to study the coil effects on the intermolecular structureof a rod-coil liquid crystalline (LC) oligomer, the esterification products of ethyl 4-[4'-oxy-4-biphenyl-carbonyloxy]-4'-biphenylcarboxylate with poly(propylene)oxides (PPO) (DP=12) and poly(ethylene oxide)s(PEO) (DP=12). Three different vibrational modes (car bonyl, aromatic C-H, and aromatic C=C) obtained fromthe Raman experiment at variable temperature indicate that PPO and PEO coils induce the hydrogen bondingin a different manner. Further information about the micro-environment around the mesogenic unit obtainedby fluorescence excitation spectra of P12-4 (LC with PP O coil) and 12-4 (LC with PEO coil) suggests that themesogenic unit of P12-4 is quite different from that of 12-4 in intermolecular structure. This study supports theresults obtained only from Raman spectroscopy, providing more accurate information about the intermolecularstructural changes of liquid crystalline polymers at a molecular level during the phase transitions.

Raman and Fluorescence Studies of Thermotropic Liquid-Crystalline Oligomers with Different Type of Coils