Multiple H-bonds directed self-assembly of an amphiphilic and plate-like codendrimer with janus faces at water-air interface.
Multiple H-bonds directed self-assembly of an amphiphilic and plate-like codendrimer with janus faces at water-air interface.
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DOI：
10.1021/ja900739e
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发表时间：
2009-04
影响因子：
15
通讯作者：
Miao Yang;Wei Wang;I. Lieberwirth;G. Wegner
中科院分区：
文献类型：
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作者：
Miao Yang;Wei Wang;I. Lieberwirth;G. Wegner
由8个羟基封端的第三代聚甲基烯丙基二氯（PMDC（OH）（8））和4个烷基封端的第二代聚氨基甲酸酯酰胺（普阿（C16）（4））组成的两亲性二嵌段共树枝状聚合物在水-空气界面上自组装成高度取向的带状物。进一步的研究表明，这些条带是由g3-PMDC（OH）（8）-b-g2-普阿（C16）（4）的两面对称和板状结构自组织形成的。存在于分子板不同位置的六重氢键是带状物一维生长的主要驱动力。这些H-键的识别导致高度有序的共树枝状聚合物的堆叠，并且烷基链的结晶导致具有ca. 7.6+/- 0.5纳米宽度。初级带优选组织成平均宽度为53 +/-6.0 nm的次级带。这种识别和组装的方式类似于一种具有两面神面孔的玩具积木的组织，这为设计定义明确的纳米材料提供了一种新的策略。
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.