R. Nessim
Jul 1, 2002
Citations
0
Influential Citations
12
Citations
Journal
Thermochimica Acta
Abstract
Abstract Four series of 4-substituted phenyl-4-alkoxybenzoates were prepared in which one substituent is a terminal alkoxy group with the number of carbon atoms kept constant (at n =6, 8, 14, or 16), while the other terminal substituent (X) alternatively changed from CH 3 O, CH 3 , Cl, CN, and NO 2 . Compounds prepared were characterized by infrared spectroscopy and their mesophase stabilities investigated by differential scanning calorimetry and polarized-light microscopy. The results were discussed in terms of mesomeric, polarity, and polarizability effects. In all four series, the mesophase–isotropic transition temperatures ( T c ) were successfully related to the polarizability anisotropy of bonds to the small compact substituent, X.