Herein, we have reported two benzothiazole-linked covalent organic framework nanostructures (BTZ-BCA-COF and BTZ-TPA-COF), which have been prepared via a highly efficient one-pot, multicomponent transition-metal-free C-H functionalization and oxidative annulation synthetic strategy and employing elemental sulfur as one of the key components. These prepared COFs are highly crystalline in nature, have high surface area, and are chemically stable. These COFs exhibit light-harvesting capacity as a photosensitizer for visible-light-assisted "carbon-boron"bond cleavage with a high functional group tolerance of the substrates. In order to acquire in-depth understanding about the mechanistic pathway involved and for comparison in photocatalytic performance, we have performed in situ electron paramagnetic resonance and studies. Our contribution sheds light on exploration of elemental sulfur to extended π-conjugation network-based photocatalysts, followed by instigating their structural uniqueness-photocatalytic activity relationship.
Bibliographical noteKAUST Repository Item: Exported on 2021-11-15
Acknowledgements: R.P. and S.C.S. acknowledge the Department of Science and Technology (DST)-INSPIRE (GAP-0799) and the Council of Scientific and Industrial Research (CSIR), New Delhi, for their respective senior research fellowships. J.M. acknowledges the CSIR, India, for the CSIR-YSA Research Grant (reference no. HRDG/YSA-19/02/21(0045)/2019) and Focused Basic Research (FBR) Grant under the CLP theme (reference no. 34/1/TD-CLP/NCP-FBR 2020-RPPBDD-TMD-SeMI) for financial support at the CSIR-IICT, Hyderabad. We sincerely thank the Director, CSIR-IICT (Ms. no. IICT/Pubs./2021/311) for providing all of the required facilities to carry out the work.