RAMAN-SPECTROSCOPIC CHARACTERIZATION OF A ROD-COIL LIQUID-CRYSTALLINEOLIGOMER-LICF3SO3 COMPLEX

The interactions between a rod-coil liquid crystalline oligomer, ethyl -oxy-4-biphenylcarbonyloxy]-4'-biphenylcarboxylate with poly(ethylene oxide) (DP=12) (12-4) and LiCF3SO3 have been characterized by using R aman spectroscopy. Band assignments were made comparing the spectrum o f 12-4 with those of the poly(ethylene glycol) monomethyl ether(PEGME) (Mw=550) and the ethyl-4'-hydroxybiphenyl-4-carboxylate (EHBPC). whic h are the coil and mesogen analogues, respectively. Analyzing characte ristic bands of the 12-4-salt complex. we have found that the bands be longing to the coil and mesogenic units are changed in both intensitie s and frequencies, The spectral changes were interpreted from the view point of the complexation between 12-4 and the Li- ion. However, the p ossibility that the spectral changes in the mesogenic unit are not due to the complexation with the Li- ion. but due to the conformational c hanges by the intercalation of nondissociated LiCF3SO3, is not ruled o ut.