科研之友
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摘要
Diradicals 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. @@@ A conical intersection between the lowest energy excited state and the ground state of the Blatter-type diradical is responsible for highly efficient light-to-heat conversion of the absorbed radiation. Also, it is first applied to photothermal therapy of tumor cells, demonstrating good stability and the highest photo-thermal conversion in the diradicaloid field.image
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单位i; 电子科技大学; 南京邮电大学; 北京化工大学
