72. Multiple H-Bonds Directed Self-Assembly of an Amphiphilic and Plate-Like Codendrimer with Janus Faces at Water-Air Interface
writer：Miao Yang, Wei Wang,* Ingo Lieberwirth, and Gerhard Wegner
keywords：Codendrimer; Water-Air Interface; Self-Assembly; Multiple H-Bonds
source：期刊
specific source：Journal of the American Chemical Society
Issue time：2009年
An amphiphilic diblock codendrimer composed of a third generation poly(methallyl dichloride) end-capped by eight hydroxyl groups (PMDC(OH)8) and a second generation poly(urethane amide) end-capped by four alkyl groups (PUA(C16)4) were found to self-assemble into highly oriented ribbons at the water−air interface. Further investigation on the ribbon formation shows that the ribbons are hierarchically self-organized by the janus and plate-like shape of g3-PMDC(OH)8-b-g2-PUA(C16)4. Sextuple H-bonds existing at different positions of the molecular plate are the main driving force for the one-dimensional growth of the ribbon. The recognition of these H-bonds leads to a highly ordered stacking of the codendrimers, and the crystallization of the alkyl chains results in a primary ribbon with a ca. 7.6 ± 0.5 nm width. The primary ribbons prefer to organize into secondary ribbons with an average width of 53 ± 6.0 nm. The manner of recognition and assembly is similar to the organization of a kind of toy building block with janus faces, which provides a new strategy to the design of well-defined nanomaterials.