화학공학소재연구정보센터
Molecular Crystals and Liquid Crystals Science and Technology. Section A. Molecular Crystals and Liquid Crystals, Vol.260, 339-350, 1995
The Synthesis, Mesomorphic Behavior and the Uniaxial Nature of 1,2,4,5-Tetra(4-Alkoxybenzoyloxy)Benzenes
A homologous series of 1,2,4,5-tetra-(4-alkoxybenzoyloxy)benzenes (2, R = C4H9, C6H13 to C16H33 and C18H37) has been synthesised. Optical microscopy revealed that the compounds with R = C4H9, C6H13 to C10H21 have a nematic phase, compounds with R = C11H23 to C14H29 have nematic and smectic C phases and compounds with R = C15H31, C16H33 and C18H37 have only a smectic C phase. The T-N-I values show an ’odd-even’ alternation which is typical of calamitic systems. The refractive indices for aligned samples of compound 2h (R = C10H21) demonstrate that the nematic phase is uniaxial.