Step-scan Fourier transform absorption difference time-resolved spectroscopy (S2FTIR
∆A TRS) has been used to collect mid-IR time-resolved infrared spectra of the transient
electronic excited states of polypyridine transition metal complexes with 10 ns time
resolution. The time-resolved data can be used for kinetic analysis or to generate
“snapshots” of the lowest lying excited state. Shifts of vibrational bands in the excited
state relative to the ground state can be used to infer significant details of the electronic
structure of the excited state. The multiplex advantage of the FTIR technique allows a
wide variety of vibrational bands to be analyzed for this purpose. In the example
illustrated, the shift of the ester ν(CO) band in {Ru(bpy)[4,4′-(COOEt)2bpy]2}2+
compared to those in related complexes has been used to address the question of electron
delocalization in the excited state.
Time‐resolved spectroscopy and electronic structure of mono‐and dinuclear pyridyl‐triazole/DPEPhos based Cu(I) complexes
