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PreprintCC BYChemRxiv

Photosensitive Phenothiazine-Fused [4]Helicenes

  • Ling-Xiao Li1,2
  • Gaoqiang Xu1,2
  • Yue Zhang1,2
  • Yonghong Xiao3
  • Guiyi Yang1,2
  • Yanning Xu1,2
  • Parvej Alam4,5
  • Zijie Qiu1,2
5 affiliations
  1. 1School of Science and Engineering
  2. 2Chinese University of Hong Kong (Shenzhen
  3. 3Chemistry and Chemical Engineering Guangdong Laboratory
  4. 4Institute of Materials Research
  5. 5Tsinghua Shenzhen International Graduate School, Tsinghua University
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Abstract

Here, we report the synthesis and photoreactivity of a phenothiazine fused [4]helicene, namely 3,13dimethoxybenzo[4,5]quinolino[3,2,1-kl]phenothiazine (MBQP). Comprehensive photophysical studies reveal that MBQP exhibits a high photoluminescence quantum yield of 60.3% and strong circularly-polarized luminescence, with high glum of 2.0 × 10-3 in DMSO. Besides its excellent chiroptical properties, MBQP can undergo a photoinduced chloroformylation reaction upon 365 nm irradiation in chloroform, enabling direct functionalization of the helicene framework. Notably, the emission of resulting photoproducts redshift to ~500, 550, and 660 nm, together with quantum yields up to 77.2%, demonstrating that the photochemical transformation can simultaneously functionalize the helicene framework and improve its luminescence performance. This work provides a straightforward example for the facile synthesis and post-functionalization of color-tunable chiral materials.

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Cite

BibTeXRIS
BibTeX
@misc{li2026photosensitive,
  title = {{Photosensitive Phenothiazine-Fused [4]Helicenes}},
  author = {Ling-Xiao Li and Gaoqiang Xu and Yue Zhang and Yonghong Xiao and Guiyi Yang and Yanning Xu and Parvej Alam and Zijie Qiu},
  howpublished = {ChemRxiv},
  year = {2026},
  month = sep,
  doi = {10.26434/chemrxiv.15008968/v1},
  url = {https://chemrxiv.org/doi/full/10.26434/chemrxiv.15008968/v1},
  note = {CC BY},
}
RIS
TY  - UNPB
TI  - Photosensitive Phenothiazine-Fused [4]Helicenes
AU  - Ling-Xiao Li
AU  - Gaoqiang Xu
AU  - Yue Zhang
AU  - Yonghong Xiao
AU  - Guiyi Yang
AU  - Yanning Xu
AU  - Parvej Alam
AU  - Zijie Qiu
PY  - 2026
DA  - 2026/09/17
PB  - ChemRxiv
DO  - 10.26434/chemrxiv.15008968/v1
UR  - https://chemrxiv.org/doi/full/10.26434/chemrxiv.15008968/v1
AB  - Here, we report the synthesis and photoreactivity of a phenothiazine fused [4]helicene, namely 3,13dimethoxybenzo[4,5]quinolino[3,2,1-kl]phenothiazine (MBQP). Comprehensive photophysical studies reveal that MBQP exhibits a high photoluminescence quantum yield of 60.3% and strong circularly-polarized luminescence, with high glum of 2.0 × 10-3 in DMSO. Besides its excellent chiroptical properties, MBQP can undergo a photoinduced chloroformylation reaction upon 365 nm irradiation in chloroform, enabling direct functionalization of the helicene framework. Notably, the emission of resulting photoproducts redshift to ~500, 550, and 660 nm, together with quantum yields up to 77.2%, demonstrating that the photochemical transformation can simultaneously functionalize the helicene framework and improve its luminescence performance. This work provides a straightforward example for the facile synthesis and post-functionalization of color-tunable chiral materials.
ER  -