Li Xin-Gui, Liao Yaozu, Huang Mei-Rong, Kaner Richard B
State Key Laboratory of Pollution Control and Resource Reuse , College of Environmental Science and Engineering , Tongji University , Shanghai 200092 , China . Email:
Department of Chemistry & Biochemistry , California NanoSystems Institute , University of California , Los Angeles , California 90095 , USA . Email:
Chem Sci. 2015 Dec 1;6(12):7190-7200. doi: 10.1039/c5sc03041b. Epub 2015 Sep 17.
Strongly fluorescence-emitting oligofluoranthene (OFA) nanorods are readily synthesized by a direct template-free chemical oxidative oligomerization of fluoranthene in nitromethane containing ferric chloride as an oxidant. The OFAs likely consist of five fluoranthene units containing cyclic pentamers with crystalline order and tunable electrical conductivity across 12 orders of magnitude. The OFA nanorods are heat-resistant materials and efficient precursors for macroporous carbon materials with high carbon yield in argon at 1100 °C. In particular, the optimal ring-like pentamer shows 12.2 times stronger cyan fluorescence-emission than recognized highly fluorescent fluoranthene under the same conditions, which makes the OFAs into ideal strong fluorescent emitters, tunable conductors, and high carbon-yield precursors for the preparation of sensors and carbon materials. These findings demonstrate an advance in the direct synthesis of oligomers from fused-ring aromatic hydrocarbons and provide a potential direction to optimize the synthesis and functionalities of wholly aromatic nanomaterials.
通过在含有氯化铁作为氧化剂的硝基甲烷中对芴进行直接无模板化学氧化低聚反应，可轻松合成强荧光发射的低聚芴（OFA）纳米棒。OFA可能由五个芴单元组成，包含具有晶体有序性的环状五聚体，其电导率在12个数量级范围内可调。OFA纳米棒是耐热材料，也是在1100℃氩气中具有高碳产率的大孔碳材料的有效前驱体。特别是，最佳的环状五聚体在相同条件下显示出比公认的高荧光芴强12.2倍的青色荧光发射，这使得OFA成为制备传感器和碳材料的理想强荧光发射体、可调导体和高碳产率前驱体。这些发现证明了从稠环芳烃直接合成低聚物方面的进展，并为优化全芳香族纳米材料的合成和功能提供了潜在方向。
