Julia Franz, Manuel Oelschlegel, J Patrick Zobel, Shao-An Hua, Jan-Hendrik Borter, Lucius Schmid, Giacomo Morselli, Oliver S Wenger, Dirk Schwarzer, Franc Meyer, Leticia González
We report a rhenium diimine photosensitizer equipped with a peripheral disulfide unit on one of the bipyridine ligands, [Re(CO)3 (bpy)(S-S bpy4,4 )]+ ( 1 + , bpy = 2,2'-bipyridine, S-S bpy4,4 = [1,2]dithiino[3,4- c :6,5- c ']dipyridine), showing anti-Kasha luminescence. Steady-state and ultrafast time-resolved spectroscopies complemented by nonadiabatic dynamics simulations are used to disclose its excited-state dynamics. The calculations show that after intersystem crossing the complex evolves to two different triplet minima: a (S-S bpy4,4 )-ligand-centered excited state (3 LC) lying at lower energy and a metal-to-(bpy)-ligand charge transfer (3 MLCT) state at higher energy, with relative yields of 90% and 10%, respectively...
April 10, 2024: Journal of the American Chemical Society