Polycatenar mesogenic properties

Thus, supermolecular liquid crystals with a cyclotriphosphazene dendritic core and polycatenar mesogenic units (144) were obtained in three steps by the conventional sequence of substitution (i), derivatization (ii and iii) methods from [N3P3CI6] (Scheme 9). Due to the microsegregation of the alkyl chains and the aromatic central cores and the space-filling properties, compounds (144) adopt a discotic conformation assembled in a columnar mesophase and illustrate the possibilities of using cyclotriphosphazenes for the design of columnar assemblies at room temperature, in the mesophase or in a vitrified solid state with interest for applications in material science. Similarly, the new family of solution processable, photoluminescent, monodisperse nanocomposite dendrimers (145) (Tg > 165 °C, > 465 °C)... 

Up to now, in most cases, polycatenars such as phasmids and biforked mesogens have been symmetrical and have not contained any polar substituents such as Br, CN, or NO2. In order to study the influence of a lateral polarity on the mesomorphic properties, some new polar and non-synunetrical poly-catenar mesogens have been prepared. 

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