Time‐resolved X‐Ray Absorption Spectroscopy of Solvated [Ru(m‐bpy)₃]²⁺ Complex: Electronic Structures of ³dd State

Abstract

Ru L 3 -edge time-resolved X-ray absorption spectroscopy (TR-XAS) was applied to unravel photo-induced excited state dynamics of solvated [Ru(m-bpy) 3 ] 2+ (m-bpy = 6-methyl-2,2 0 -bipyridine) complex. The Ru L 3 -edge probes 2p core-level transitions, enabling to monitor the electronic structure of excited 3 dd state. TR-XAS and time-dependent density functional theory were utilized to directly visualize the charge density of 3 dd state around the Ru atom during the relaxation cascade of [Ru(m-bpy) 3 ] 2+ complex. The formation of 3 dd state is attributed to the reduced effective ligand field strength, which was derived from the TR-XAS of 3 dd state at 100 ps. These results highlight the role of ligand-field 3 dd state in the photoinduced relaxation dynamics of [Ru(m-bpy) 3 ] 2+ complex.

Photoexcitation dynamics of azide ion bound ferric myoglobin probed by femtosecond infrared spectroscopy

“…Details of the TR spectrometer have been described elsewhere. 17 In short, an intense 800 nm pulse with a repetition rate of 1 kHz from a Ti:sapphire amplifier pumped two optical parametric amplifiers (OPAs), [18][19][20][21][22] which generated a visible pump pulse and a mid-IR probe pulse. Frequency doubling of a signal pulse from one OPA generated a 3 μJ visible pump pulse at 575 nm, and difference frequency mixing of the signal and idler pulses from the other OPA produced a tunable mid-IR probe pulse.…”