N,N-Disubstituted Ureas: Influence of Substituents on the Formation of Supramolecular Polymers
作者:Frédéric Lortie、Sylvie Boileau、Laurent Bouteiller
DOI:10.1002/chem.200304801
日期:2003.7.7
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 alpha carbon, or an ethyl group on the beta carbon). Due to the strong, bifurcated hydrogen bonds between
已经合成并表征了对称的N,N'-二取代脲。其中,制备的支链二烷基脲在有机介质中高度可溶。此外,如果支链烷基基团不太庞大(即,α碳上的甲基或β碳上的乙基),则所得溶液在庚烷中的粘度非常高。由于脲部分之间的牢固的,分叉的氢键,形成了线性的超分子聚合物。这些超分子聚合物的缔合度已经通过FTIR光谱法确定。