Abstract
Abstract. - ESR studies of chain organization in 4,4'-dioctadecyloxyazoxybenzene are reported. The spin labels, closely resembling the host molecule, were marked at different positions along the chain. Various phase transitions were studied. Some paramagnetic liquid crystals were synthetized. Their mesophases have been identified. Spin labelled molecules can : 1. Spin label studies. - We have studied a number of features of the smectic polymorphism of 4,4'-octade- be as labels at low 'OnCentra- cyloxyazoxybenzene 1 (ODOAB) by means of a series (IoT3 ''-3 in an unlabelled liquid of spin labels 2 very c-osely related to the host molecule matrix. and carrying-the paramagnetic labelling group at 2. give rise to mesomorphic phases. different points on the end chain : 1.1 SOLID o SB TRANSITION. - The observation of a large discontinuous decrease of the end chain order parameter at the solid + S, transition can be inter- preted as a melting of the chains and tends to support of model of this S, phase as a series of decoupled two- dimensional solids El]. A consideration of the calorimetric data (entropy change) at the solid
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