Photochemical properties of enediyne-cored dendrimers bearing naphthalenes at the periphery

Photochemical properties of enediyne-cored dendrimers bearing naphthalenes at the periphery
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外围带有萘的烯二炔核树枝状聚合物的光化学性质

DOI:
10.1139/cjc-2018-0128
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发表时间:
2019
影响因子:
1.1
通讯作者:
Arai Tatsuo
Arai Tatsuo
中科院分区:
化学4区
文献类型:
--
作者:
Ichino Rina;Momotake Atsuya;Arai Tatsuo

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合成了一系列新型的以萘为核的树枝状大分子,并研究了它们的光化学性质。光稳态下的反式/顺式异构体比依赖于树枝状大分子中的激发位点。当烯二炔核被选择性激发时,由于反式烯二炔的摩尔消光系数较大,所有树枝状聚合物中光稳态下的反式/顺式异构体比约为50/50或为富含酸的混合物。另一方面,当萘被激发时,尽管在transdendrimers中能量转移效率几乎是定量的,但在更高代的树枝状聚合物中意外地获得了富含atrans的混合物。这些结果可以解释的能量传递过程,这是不同的几何异构体的烯二炔核心。
A novel series oftransandcisenediyne-cored dendrimers bearing naphthalenes at the periphery were synthesized and their photochemical properties were examined. Thetrans/cisisomer ratio in the photostationary state was dependent on the excitation site in the dendrimers. When the enediyne core was selectively excited, thetrans/cisisomer ratio in the photostationary state was either around 50/50 or acis-rich mixture in all dendrimers due to the larger molar extinction coefficient of thetrans-enediynes. On the other hand, when naphthalene was excited, atrans-rich mixture was unexpectedly obtained in higher generation dendrimers even though the energy transfer efficiency was almost quantitative in thetransdendrimers. These results could be explained by the energy transfer process, which was different depending on the geometric isomerism of the enediyne core.
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发表时间: 1979-01-01
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