Electron-accepting phthalocyanine–pyrene conjugates: towards liquid phase exfoliation of graphite and photoactive nanohybrid formation with graphene
Electron-accepting phthalocyanine–pyrene conjugates: towards liquid phase exfoliation of graphite and photoactive nanohybrid formation with graphene
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DOI：
10.1039/c4sc00709c
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发表时间：
2014-07
期刊：
影响因子：
8.4
通讯作者：
A. Roth;M. Ragoussi;L. Wibmer;Georgios Katsukis;G. Torre;T. Torres;D. Guldi
中科院分区：
文献类型：
--
作者：
A. Roth;M. Ragoussi;L. Wibmer;Georgios Katsukis;G. Torre;T. Torres;D. Guldi
在这里，我们描述了锌（II）烷基磺酰基酞菁-芘共轭物的合成，其组装高度剥离的石墨，以及所得纳米杂化材料的物理性质的调查。共轭物中芘单元的存在对于将电子接受酞菁非共价固定到高度剥离的石墨的基面上是决定性的。事实上，在基态和激发态下，强相互作用主导了纳米杂化物的电子性质。例如，飞秒泵浦探测实验有助于证实超快电荷分离，即，在387 nm照射后产生酞菁和单电子氧化石墨烯的单电子还原自由基阴离子，然后缓慢电荷复合。
Herein, we describe the synthesis of a zinc(II) alkylsulfonylphthalocyanine–pyrene conjugate, its assembly with highly exfoliated graphite, and the investigation of the photophysical properties of the resulting nanohybrid. The presence of the pyrene unit in the conjugate is decisive in terms of non-covalently immobilizing the electron accepting phthalocyanines onto the basal plane of highly exfoliated graphite. As a matter of fact, strong interactions dominate the electronic properties of the nanohybrid in both the ground and excited states. For example, femtosecond pump probe experiments assist in corroborating an ultrafast charge separation, that is, the generation of the one-electron reduced radical anion of the phthalocyanine and one-electron oxidized graphene after irradiation at 387 nm, followed by slow charge recombination.