Functional properties as amphiphiles of novel nanomolecular material, dendrimer

树状大分子由核心、重复单元和功能末端组成，有望成为具有复杂功能的材料。这种新功能也来自于树突分子的组织结构。本文合成了具有疏水末端（正己基）和亲水末端（羟基、糖苷或胺）的两亲性树状大分子，并对其固液（水）界面上的分子组装进行了研究。具有正己基/胺末端的树状大分子的组装能力略低于具有正己基/羟基末端的树状大分子，但其组装能力优于具有正己基/糖苷末端的树状大分子。自组装单层膜是一种有组织的分子组装。由于我们已经发现羧酸衍生物和硫醇衍生物一样可以构建自组装的单层，所以我们研究了从具有羧酸末端的树状大分子制备单层的方法。所述树状大分子在金属底物上的吸附优于胺末端的树状大分子。过量的吸附取决于pH被观察到，但自组装的单层不从底物解吸，即使经过水冲洗。证实了羧酸与金属底物的相互作用导致了单分子层的形成。

Dendrimers, which consist of a core, repeating units, and functional terminals, are expected as materials with complex functionalities. The novel functionality also generates from the organization of dendrimers. In the present work, amphiphilic dendrimers with hydrophobic (n-hexyl) terminals and hydrophilic (hydroxyl, glycoside, or amine) terminals were synthesized, and the molecular assemblies at the solid-liquid (water) interface were examined. A dendrimer with n-hexyl/amine terminals displayed slightly less ability of assembly formation than a dendrimer with n-hexyl/hydroxyl terminals, but the ability was superior to that of a dendrimer with n-hexyl/glycoside terminals.Self-assembled monolayer is one of organized molecular assemblies. Since we have found that carboxylic acid derivatives construct self-assembled monolayers as well as thiol derivatives, the monolayer preparation from a dendrimer with carboxylic acid terminals was examined. The dendrimer adsorbed more preferably on metal substrate than that with amine terminals. The excess adsorption depending on pH was observed, but the self-assembled monolayer does bot desorb from the substrate even after the rinse by water. It was confirmed that the monolayer formation proceeds owing to the interaction of carboxylic acid with metal substrate.