The development of new chromophoric receptors capable of binding curved carbon nanostructures is central to the quest for improved fullerene-based organic photovoltaics. We herein report the synthesis and characterization of a subphthalocyanine-based multicomponent ensemble consisting of two electron-rich SubPc-monomers rigidly attached to the convex surface of an electron-poor SubPc-dimer. Such a unique configuration, especially in terms of the two SubPc-monomers, together with the overall stiffness of the linker, endows the multicomponent system with a well-defined tweezer-like topology to efficiently embrace a fullerene in its inner cavity. The formation of a 1 : 1 complex was demonstrated in a variety of titration studies with either C₆₀ or C₇₀. In solution, the underlying association constants were of the order of 10⁵ M⁻¹. Detailed physicochemical experiments revealed a complex scenario of energy- and electron-transfer processes upon photoexcitation in the absence and presence of fullerenes. The close proximity of the fullerenes to the electron-rich SubPcs enables a charge shift from the initially formed reduced SubPc-dimer to either C₆₀ to C₇₀.

中文翻译：

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用于富勒烯选择性络合的光敏预组织亚酞菁基分子镊子

能够结合弯曲碳纳米结构的新型发色团受体的开发是寻求改进的基于富勒烯的有机光伏的核心。我们在此报告了基于亚酞菁的多组分集合的合成和表征，该集合由两个富含电子的 SubPc 单体组成，这些单体刚性连接到缺电子的 SubPc 二聚体的凸面。这种独特的配置，特别是在两个 SubPc 单体方面，连同连接器的整体刚度，赋予多组分系统明确定义的镊子状拓扑结构，以有效地在其内腔中包含富勒烯。在使用C ₆₀或C ₇₀进行的各种滴定研究中证明了 1 : 1 复合物的形成. 在溶液中，潜在的缔合常数为 10 ⁵ M ^{-1 的数量级}。详细的物理化学实验揭示了在富勒烯不存在和存在的情况下光激发时能量和电子转移过程的复杂情况。富勒烯与富含电子的 SubPcs 的紧密接近使得电荷从最初形成的还原的 SubPc-二聚体转移到C ₆₀到C ₇₀。