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- W4224301652 abstract "Abstract Helically twisted conductive nanocarbon materials are applicable to optoelectronic and electromagnetic molecular devices working on the nanometer scale. Herein, we report the synthesis of per- peri -perbenzo[5]- and [9]helicenes in addition to previously reported π-extended [7]helicene. The homogeneously π-extended helicenes can be regarded as helically fused oligo-phenanthrenes. The HOMO−LUMO gap decreased significantly from 2.14 to 1.15 eV with increasing helical length, suggesting the large effective conjugation length (ECL) of the π-extended helical framework. The large ECL of π-extended helicenes is attributed to the large orbital interactions between the phenanthrene subunits at the 9- and 10-positions, which form a polyene-like electronic structure. Based on the experimental results and DFT calculations, the ultrafast decay dynamics on the sub-picosecond timescale were attributed to the low-lying conical intersection." @default.
- W4224301652 created "2022-04-26" @default.
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- W4224301652 date "2022-04-04" @default.
- W4224301652 modified "2023-10-18" @default.
- W4224301652 title "Doubly linked chiral phenanthrene oligomers for homogeneously π-extended helicenes with large effective conjugation length" @default.
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- W4224301652 doi "https://doi.org/10.1038/s41467-022-29108-8" @default.
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