Details

Autor(en) / Beteiligte

• Li, Tao
• Liu, Jia-Chuan
• Liu, En-Ping
• Liu, Bai-Tong
• Wang, Jing-Yu
• Liao, Pei-Yu
• Jia, Jian-Hua
• Feng, Yuanning
• Tong, Ming-Liang

Titel

NIR-II photothermal conversion and imaging based on a cocrystal containing twisted components

Ist Teil von

• Chemical science (Cambridge), 2024-01, Vol.15 (5), p.1692-1699

Ort / Verlag

England: Royal Society of Chemistry

Erscheinungsjahr

2024

Link zum Volltext

Quelle

Elektronische Zeitschriftenbibliothek

Beschreibungen/Notizen

• On account of the scarcity of molecules with a satisfactory second near-infrared (NIR-II) response, the design of high-performance organic NIR photothermal materials has been limited. Herein, we investigate a cocrystal incorporating tetrathiafulvalene (TTF) and tetrachloroperylene dianhydride (TCPDA) components. A stable radical was generated through charge transfer from TTF to TCPDA, which exhibits strong and wide-ranging NIR-II absorption. The metal-free TTF-TCPDA cocrystal in this research shows high photothermal conversion capability under 1064 nm laser irradiation and clear photothermal imaging. The remarkable conversion ability-which is a result of twisted components in the cocrystal-has been demonstrated by analyses of single crystal X-ray diffraction, photoluminescence and femtosecond transient absorption spectroscopy as well as theoretical calculations. We have discovered that space charge separation and the ordered lattice in the TTF-TCPDA cocrystal suppress the radiative decay, while simultaneously strong intermolecular charge transfer enhances the non-radiative decay. The twisted TCPDA component induces rapid charge recombination, while the distorted configuration in TTF-TCPDA favors an internal non-radiative pathway. This research has provided a comprehensive understanding of the photothermal conversion mechanism and opened a new way for the design of advanced organic NIR-II photothermal materials. we incorporated redox-active tetrathiafulvalene (TTF) and tetrachloroperylene dianhydride (TCPDA) into a cocrystal and its effective NIR-II photothermal which results from the twisted conformation was characterized and analysed.