Two selenoviologen (SeV2+)-appendant metallacycles with tunable optoelectronic properties were synthesized. Selenoviologen radical cations (SeV+.) can be stabilized due to the metallacyclic effect (strong π–π stacking and push–pull electron structures), which were validated by electrochromism. Femtosecond transient absorption (fs-TA) spectra not only confirmed the long-lived charge separation states of metallacycle, but also demonstrated its vital role in visible-light-induced cross-dehydrogenative coupling (CDC) reactions with high efficiency (>80 %).

原文链接：https://onlinelibrary.wiley.com/doi/full/10.1002/anie.202209054