77 % Photothermal Conversion in Blatter‐Type Diradicals: Photophysics and Photodynamic Applications

Author:

Ji Yu1,Moles Quintero Sergio2,Dai Yasi34,Marín‐Beloqui Jose M.2,Zhang Hanjun1,Zhan Qian1,Sun Fanxi1,Wang Dongsheng1ORCID,Li Xiangkun5,Wang Zhiyi5,Gu Xinggui6,Negri Fabrizia34,Casado Juan2ORCID,Zheng Yonghao17ORCID

Affiliation:

1. School of Optoelectronic Science and Engineering University of Electronic Science and Technology of China (UESTC) Chengdu 610054 P. R. China

2. Department of Physical Chemistry University of Málaga Campus de Teatinos s/n 29071 Málaga Spain

3. A Dipartimento di Chimica ‘Giacomo Ciamician' Università di Bologna Via F. Selmi, 2 40126 Bologna Italy

4. INSTM, UdR Bologna Via F. Selmi, 2 40126 Bologna Italy

5. Spin-X Institute School of Chemistry and Chemical Engineering South China University of Technology Guangzhou 510641 P. R. China

6. Beijing Advanced Innovation Center for Soft Matter Science and Engineering College of Materials Science and Engineering State Key Laboratory of Chemical Resource Engineering Beijing University of Chemical Technology Beijing 100029 P. R. China

7. State Key Laboratory of Organic Electronics and Information Displays & Institute of Advanced Materials(IAM) Nanjing University of Posts & Telecommunications 9 Wenyuan Road Nanjing 210023 P. R. China

Abstract

AbstractDiradicals based on the Blatter units and connected by acetylene and alkene spacers have been prepared. All the molecules show sizably large diradical character and low energy singlet‐triplet gaps. Their photo‐physical properties concerning their lowest energy excited state have been studied in detail by steady‐state and time‐resolved absorption spectroscopy. We have fully identified the main optical absorption band and full absence of emission from the lowest energy excited state. A computational study has been also carried out that has helped to identify the presence of a conical intersection between the lowest energy excited state and the ground state which produces a highly efficient light‐to‐heat conversion of the absorbed radiation. Furthermore, an outstanding photo‐thermal conversion 77.23 % has been confirmed, close to the highest in the diradicaloid field. For the first time, stable diradicals are applied to photo‐thermal therapy of tumor cells with good stability and satisfactory performance at near‐infrared region.

Funder

National Natural Science Foundation of China

Basic and Applied Basic Research Foundation of Guangdong Province

Publisher

Wiley

Subject

General Chemistry,Catalysis

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