Supramolecular Singlet Fission of Pentacene Dimers within Polyaromatic Capsules
Supramolecular Singlet Fission of Pentacene Dimers within Polyaromatic Capsules
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DOI：
10.1021/jacs.0c13172
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发表时间：
2021-06-16
影响因子：
15
通讯作者：
Yoshizawa, Michito
中科院分区：
文献类型：
--
作者：
Catti, Lorenzo;Narita, Haruna;Yoshizawa, Michito
本文报道了一组新的超分子纳米工具，用于产生和调制非共价/共价五苯二聚体的单线态裂变（SF）。两个具有大取代基的并五苯单体分子在水中被由萘基弯曲两亲体组成的多芳香胶囊很容易地包裹起来。即使在高稀释条件下，封装的非共价二聚体也能以高量子产率（分别为179%和53%）转化为无法检测的三联体对和单个三联体。在胶囊内，具有大基团的共价连接的并五苯二聚体平行产生两个三重态对中间体，这在散装溶液中几乎没有区别，具有优异的总量子产率（196%）。包封后，单个三联体的产率提高了1.6倍。对于这两种类型的并五苯二聚体，SF特征可以很容易地通过改变胶囊的多芳香面板（即蒽和菲）来调整。
We herein report a new set of supramolecular nanotools for the generation and modulation of singlet fission (SF) of noncovalent/covalent pentacene dimers. Two molecules of a pentacene monomer with bulky substituents are facilely encapsulated by a polyaromatic capsule, composed of naphthalene-based bent amphiphiles, in water. The encapsulated noncovalent dimer converts to otherwise undetectable triplet pairs and an individual triplet in high quantum yields (179% and 53%, respectively) even under high dilution conditions. Within the capsule, a covalently linked pentacene dimer with bulky groups generates two triplet pair intermediates in parallel, which are hardly distinguished in bulk solution, in excellent total quantum yield (196%). The yield of the individual triplet is enhanced by 1.6 times upon encapsulation. For both types of pentacene dimers, the SF features can be readily tuned by changing the polyaromatic panels of the capsule (i.e., anthracene and phenanthrene).