Vibrational Coherences and Relaxation in the High-Spin State of Aqueous Fe~(II)(bpy)3~(2+)

摘要

Iron(II)-based molecular complexes have been a subject of intense study since the discovery of light-induced excited-state spin trapping (LIESST). In this process, excitation of the singlet low-spin (LS) ground state with UV or visible light to the metal-to-ligand charge-transfer states (~(1,3)MLCT) or to the lower-lying singlet and triplet ligand-field (~(1,3)LF, also called metal-centered) states (see Figure S1 in the Supporting Information) leads to population of the lowest high-spin (HS) excited quintet ~5T_2 state by nonradiative relaxation.