This article reports new results on synthesis and mesomorphic properties of the homologous series of (S)-1-methylheptyl-4-(4'-alkyloxybiphenylthiocarboxy)-benzoates, referred to as (S)-MHPSBOn, where Ovaries from 7 to 10 and denotes the number of carbon atoms in the alkyl chain. These compounds are sulphur analogous to a liquid crystal known as MHPOBC, where the central ester bridge was replaced with the -COS- connecting group. The (S)-MHPSBOn homologous series possesses enantiotropic SmA*, SmC*, SmCA* and monotropic Sml(*) phases for n = 7-10. The (S)-MHPSBO7 compound has also smectic chiral subphases: SmC alpha*, and SmC gamma*. Their mesomorphic properties were investigated by means of polarizing optical microscopy (ROM), differential scanning calorimetry (DSC). transmittance light intensity (TLI). X-ray diffraction and electro-optic (DO) measurements. (C) 2010 Elsevier B.V. All rights reserved.