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首页> 外文期刊>Chemistry: A European journal >Multichromophoric phthalocyanine-(perylenediimide)_8 molecules: A photophysical study
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Multichromophoric phthalocyanine-(perylenediimide)_8 molecules: A photophysical study

机译：多发色酞菁-（per二酰亚胺）_8分子：光物理研究

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摘要

We describe the synthesis of a series of phthalocyanine (Pc)-perylenediimide (PDI)_8 "octad" molecules, in which eight PDI moieties are attached to a Pc core through alkyl-chain linkers. There is clear spectroscopic evidence that these octads can exist as non-aggregated "monomers" or form aggregates along the Pc cores, depending on the type of Pc and the solvent medium. In the low dielectric constant solvents, into which the octads are soluble, photoexcitation of the PDI units leads to rapid energy transfer to the Pc centre, rather than a charge separation between moieties. In octad monomers, the Pc singlet excited-state decays within tens of ps, whereas the excitons are stabilised in the aggregated form of the molecules, typically with lifetimes in the order of 1-10 ns. By contrast, in an octad design in which π-π interactions are suppressed by the steric hindrance of a corona of incompatible glycol tails around the molecule, a more straightforward photophysical interaction of F?rster energy transfer between the PDI moieties and Pc core may be inferred. We consider these molecules as prototypical multichromophoric aggregates, giving delocalised states with considerable flexibility of design.
机译：我们描述了一系列的酞菁（Pc）-di二酰亚胺（PDI）_8“ octad”分子的合成，其中八个PDI部分通过烷基链接头连接到Pc核心。明确的光谱学证据表明，这些八单元组可以非聚集的“单体”形式存在，也可以沿Pc核形成聚集体，具体取决于Pc的类型和溶剂介质。在八元溶解的低介电常数溶剂中，PDI单元的光激发导致能量快速转移到Pc中心，而不是部分之间的电荷分离。在八单元单体中，Pc单线态的激发态在数十ps内衰减，而激子则以分子的聚集形式稳定下来，使用寿命通常为1-10 ns。相比之下，在八分体设计中，分子周围不相容的乙二醇尾部的电晕的位阻抑制了π-π相互作用，PDI部分和Pc核之间的Fsterster能量转移的更直接的光物理相互作用可能是推断。我们认为这些分子是典型的多发色团聚体，使离域态具有相当大的设计灵活性。

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