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N,N′-Disubstituted Ureas: Influence of Substituents on the Formation of Supramolecular Polymers

✍ Scribed by Frédéric Lortie; Sylvie Boileau; Laurent Bouteiller

Publisher
John Wiley and Sons
Year
2003
Tongue
English
Weight
190 KB
Volume
9
Category
Article
ISSN
0947-6539

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✦ Synopsis

Abstract

Symmetrical N,N′‐disubstituted ureas have been synthesized and characterized. Among them, the branched dialkylureas prepared are highly soluble in organic media. Moreover, the solutions obtained are very viscous in heptane, if the branched alkyl groups are not too bulky (i.e. a methyl group on the α carbon, or an ethyl group on the β carbon). Due to the strong, bifurcated hydrogen bonds between the urea moieties, linear supramolecular polymers are formed. The degree of association of these supramolecular polymers has been determined by FTIR spectroscopy.

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