Using an aromatic linker to optimize charge-resonance states, photodimerization and reversibility in covalent anthracene dimers.

• Tác giả: Rabih O Al-Kaysi, Christopher J Bardeen, Abel Carreras, David Casanova, Robert J Dillon, Takashi Kubo, Kevin Lam, Tomohiko Nishiuchi
• Ngôn ngữ: eng
• Ký hiệu phân loại: 658.32259 Personnel management (Human resource management)
• Thông tin xuất bản: England : Physical chemistry chemical physics : PCCP , 2025
• Bộ sưu tập: NCBI
• ID: 676616

Tóm tắt

The intramolecular [4+4] photodimerization of anthracene chromophores in covalent assemblies can be harnessed to create negative photochromic systems. This paper reports the characterization of the photophysical and photochemical properties of a new class of asymmetric phenyl-linked bis(anthracene) photochromes and compares their behavior with that of a previously studied symmetric ethylene-linked analog. Steady-state and femtosecond time-resolved spectroscopic experiments show that both types of bis(anthracenes) support a neutral bright state along with a lower-energy charge resonance state. After photoexcitation, both states relax on sub-10 ps timescales, but with significantly different photodimerization quantum yields: 0.83 using 532 nm excitation of the charge-resonance state