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Liquid-Crystalline Dendrimers Designed by Click Chemistry

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journal contribution
posted on 2016-04-20, 18:48 authored by Sebastiano Guerra, Thi Le Anh Nguyen, Julien Furrer, Jean-François Nierengarten, Joaquín Barberá, Robert Deschenaux
Liquid-crystalline dendrimers have been prepared from second-generation Percec-type poly­(benzyl ether) dendrons or second-generation poly­(aryl ester) dendrons carrying cyanobiphenyl mesogens. The Janus dendrimer, which combines the two types of dendromesogens, has also been synthesized. Those compounds have been prepared under copper-catalyzed azide–alkyne cycloaddition conditions. The mesomorphic properties have been studied by thermal analysis (POM, DSC) and small-angle X-ray scattering. Smectic A, nematic, and columnar phases have been observed depending on the dendritic building blocks. The click reaction has proven to be a powerful and elegant synthetic tool for the design of complex dendritic liquid-crystalline architectures.

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