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首页> 外文期刊>The journal of physical chemistry, A. Molecules, spectroscopy, kinetics, environment, & general theory >Size-Dependent Relaxation Processes of Photoexcited [n]Cycloparaphenylenes (n=5-12): Significant Contribution of Internal Conversion in Smaller Rings
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Size-Dependent Relaxation Processes of Photoexcited [n]Cycloparaphenylenes (n=5-12): Significant Contribution of Internal Conversion in Smaller Rings

机译：相磷的尺寸依赖性弛豫过程[n]环丙基苯基（n = 5-12）：内部转换在较小环中的显着贡献

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摘要

[n]Cycloparaphenylenes ([n]CPPs; n, number of phenyl rings) have gained considerable attention because they exhibit interesting properties owing to their highly strained structure and radially oriented p orbitals. Recently, [n]CPPs with n >= 5 have been synthesized, but the ring-size dependence of the deactivation processes of the excited states has not been explained particularly for smaller [n]CPPs (n <= 7). In the present study, we characterized the deactivation processes of [n]CPPs (5 <= n <= 12) using transient absorption spectroscopy at sub-pico-, sub-nano-, nano-, and microsecond time scales. Although the fluorescence quantum yield increased with the ring size, the longest S-1 -state lifetime was observed with [8]CPP, and both the decrease and increase of the ring size resulted in the decrease of the lifetime. Characterization of the intersystem crossing and internal conversion processes explained unique ring-size dependence of the deactivation processes of [n]CPPs, i.e., the enhanced radiation rate of the larger CPP and the fast internal conversion rate of smaller CPP dominate their S-1-state lifetimes.
机译：环偶苯基（[N] CPPS; N，苯环数量）已经获得了相当大的关注，因为它们具有由于其高度应变的结构和径向取向的P轨道而表现出有趣的性能。最近，具有n> = 5的[n] CPP已经合成，但是尚未解释激发态的失活过程的环尺寸依赖性，特别是对于较小的[n] CPP（n <= 7）。在本研究中，我们在子微微族，子纳米，纳米，纳米和微秒尺度下使用瞬态吸收光谱来表征[n] cpps（5 <= n <= 12）的去激活过程。尽管荧光量子产率随着环尺寸而增加，但是用[8] CPP观察到最长的S-1 - 持久寿命，并且环尺寸的降低和增加导致寿命的降低。间隔交叉和内部转换过程的表征解释了[n] CPP的失活过程的独特环尺寸，即，较大CPP的增强辐射率以及较小的CPP的快速内部转换率占主导地位的S-1-国家寿命。

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