Synthesis of fullerodendrons with an ammonium unit at the focal point and their cooperative self-assembly on a fluorescent ditopic crown ether receptor.
Synthesis of fullerodendrons with an ammonium unit at the focal point and their cooperative self-assembly on a fluorescent ditopic crown ether receptor.
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焦点处具有铵单元的富勒木酮的合成及其在荧光二位冠醚受体上的协同自组装。
DOI：
10.1002/chem.200501238
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发表时间：
2006
期刊：
影响因子：
--
通讯作者：
A. Albrecht‐Gary
中科院分区：
文献类型：
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作者：
J. Nierengarten;U. Hahn;A. Trabolsi;Haiko Herschbach;F. Cardinali;M. Elhabiri;E. Leize;A. van Dorsselaer;A. Albrecht‐Gary
已经制备了具有1、2或4个外围富勒烯亚基和在焦点处的铵功能的树枝状分支。ES-MS研究首次证明了它们与带有一个或两个冠醚部分的oligophenylenevinylene受体形成自组装树枝状结构的能力。这些超分子复合物是多组分光活性器件，其中中心受体的发射被富勒烯单元显著地猝灭。由于不同分子亚基的结合而产生的这种新性质允许通过荧光滴定对自组装过程进行详细的研究。结合研究揭示了富勒烯树枝状聚合物与ditopic受体组装的积极协同效应。有趣的是，超分子2：1结构的稳定性随着树枝状单元尺寸的增加而增加。这种积极的树枝状效应已被解释为当富勒烯亚基的数量增加时，两个树枝状客体之间的较大数量的可能的分子内富勒烯-富勒烯相互作用。
Dendritic branches with 1, 2, or 4 peripheral fullerene subunits and an ammonium function at the focal point have been prepared. Their ability to form self-assembled dendritic structures with oligophenylenevinylene receptors bearing one or two crown ether moieties has been evidenced by ES-MS studies for the first time. These supramolecular complexes are multicomponent photoactive devices in which the emission of the central receptor is dramatically quenched by the fullerene units. This new property resulting from the association of the different molecular subunits allowed detailed investigations of the self-assembly process by means of fluorescence titrations. The binding studies have revealed positive cooperative effects for the assembly of the fullerodendrimers with the ditopic receptor. Interestingly, the stability of the supramolecular 2:1 structures increases as the size of the dendritic unit increases. This positive dendritic effect has been explained by the larger number of possible intramolecular fullerene-fullerene interactions between the two dendritic guests when the number of fullerene subunits is increased.
DOI：
--
发表时间：
2001
期刊：
--
影响因子：
--
作者：
J. Fréchet;D. Tomalia
通讯作者：
J. Fréchet;D. Tomalia