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首页> 外文期刊>The journal of physical chemistry, A. Molecules, spectroscopy, kinetics, environment, & general theory >Prolonged Charge-Separated States of Starburst Tetra(diphenylaminofluoreno)[60]fullerene Adducts upon Photoexcitation
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Prolonged Charge-Separated States of Starburst Tetra(diphenylaminofluoreno)[60]fullerene Adducts upon Photoexcitation

机译：光激发时星爆四（二苯基氨基氟）[60]富勒烯加合物的电荷分离态延长。

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摘要

Construction of starburst C_(60)(>DPAF-C_9)_4 pentads was coupled with the use of highly fluorescent diphenylaminofluorene-C_9 (DPAF-C_9) addends as donor components in conjunction with the fullerene acceptor during single-photon excitation processes. High quantum yields (CS) of charge-separation processes in the range 0.83-0.90 for _(60)(>DPAF-C_9)n (n = 1, 2, or 4) were obtained in the formation of _(60)-(>DPAF+-C_9)(>DPAF-C_9)n-1 transient states. The lifetime of the radical ion-pairs (RIP) was found to be 900 ns for starburst _(60)(>DPAF-C_9)_4 (3) samples, which is 6-fold longer than that of the linear analogue _(60)(>DPAF-C_9) (1), with a ca. 2 times increase of the charge-separation rate (kCS) compared to that of 1. These data implied the important role of sterically hindered DPAF-C9 pendants arranged in a starburst-like environment that encapsulates the central _(60) core on extending the RIP. We interpreted the phenomena by the occurrence of intramolecular migration or exchange of electron or positive charge among multiple DPAF-C9 pendants of _(60)-(>DPAF+-C_9)(>DPAF-C_9)n-1, which gives an increased rate in charge generation and delayed charge recombination.
机译：星爆C_（60）（> DPAF-C_9）_4五单元组的构建与在单光子激发过程中与富勒烯受体结合使用高荧光二苯基氨基芴-C_9（DPAF-C_9）加成物作为富勒烯受体。在_（60）-的形成中获得了_（60）（> DPAF-C_9）n（n = 1、2或4）的电荷分离过程的高量子产率（CS）在0.83-0.90范围内。 （> DPAF + -C_9）（> DPAF-C_9）n-1瞬态。发现星爆_（60）（> DPAF-C_9）_4（3）个样品的自由基离子对（RIP）的寿命为900 ns，比线性类似物_（60）长6倍。 ）（> DPAF-C_9）（1），带有一个与1相比，电荷分离率（kCS）增长了2倍。这些数据暗示了空间受阻的DPAF-C9悬垂物的重要作用，该悬垂物布置在爆炸形的环境中，该中心在扩展中心时包裹了中心_（60）核。 RIP。我们通过在_（60）-（> DPAF + -C_9）（> DPAF-C_9）n-1的多个DPAF-C9侧链之间发生分子内迁移或电子交换或正电荷交换来解释这种现象产生电荷和延迟电荷重组。

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