首页> 外文期刊>Chemistry: A European journal >Adducts between Dansylated PolyACHTUNGTRENUNG(propylene amine) Dendrimers and Anthracene Clips Mediated by Zn~II Ions: Highly Efficient Photoinduced Energy Transfer
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Adducts between Dansylated PolyACHTUNGTRENUNG(propylene amine) Dendrimers and Anthracene Clips Mediated by Zn~II Ions: Highly Efficient Photoinduced Energy Transfer

机译:Zn〜II离子介导的丹酰化聚ACHTUNGTRENUNG(丙烯胺)树状大分子与蒽夹之间的加合物:高效光致能量转移

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摘要

A family of poly(propylene amine) dendrimers, decorated at their periphery with 4, 16, and 32 dansyl units and a molecular clip, composed of two anthracene sidewalls and a disulfate benzene bridging unit, show intense UV absorption and strong fluorescence in the visible region when in a CH_3CN/CH_2Cl_2 (1:1, v/v) solvent mixture. Both these classes of compounds are good ligands for ZnII ions, as demonstrated by the changes in the absorption and fluorescence spectra upon addition of metal ions. These coordinating properties have been exploited in the self-assembly of complex structures in which the interaction between a dansylated dendrimer and anthracenefunctionalized clips is mediated by Zn~(II) ions. The self-assembly process is reversible and the number of metal ions and molecular clips associated with each dendrimer increases with the generation number. In these adducts, an energy transfer process from the anthracene to yield the fluorescent excited state of dansyl takes place with almost unitary efficiency.
机译:聚(丙烯胺)树枝状聚合物家族,在其外围装饰有4、16和32个丹磺酰基单元和一个分子夹,该分子夹由两个蒽侧壁和一个二硫酸苯桥连单元组成,在可见光中表现出强烈的紫外线吸收和强荧光处于CH_3CN / CH_2Cl_2(1:1,v / v)溶剂混合物中的区域。这两类化合物都是ZnII离子的良好配体,如添加金属离子后吸收光谱和荧光光谱的变化所证明。这些配位性质已被用于复杂结构的自组装中,其中被Zn〜(II)离子介导的丹磺化树状大分子与蒽官能化的夹子之间的相互作用。自组装过程是可逆的,并且与每个树枝状大分子相关的金属离子和分子夹子的数量随世代数的增加而增加。在这些加合物中,发生了从蒽到丹磺酰荧光激发态的能量转移过程,几乎达到了单一效率。

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