Abstract
This paper describes synthesis and physico-chemical properties of 2-oxo-2H-chromen-6-yl 6-alkoxybenzoates (compounds 1-n) and 6-thioalkylbenzoates (compounds 2-n). Compounds 1-n exhibit a monotropic nematic phase for earlier member or a monotropic smectic A phase for later ones, while compounds 2-n are non-mesogenic even in a rapid cooling process. The virtual transition temperature from isotropic phase to smectic A phase for compounds 2-10 was estimated to be 70℃ by means of a binary phase diagram. It was found that both compounds 1-n and 2-n form gel in organic solvents, such as propylene carbonate, acetonitrile. However, there are differences between the gelation ability of compounds 1-n and that of 2-n.
