Top: TRIR spectra of ReI(dmp)(W)AzCuII measured in the ps time range after 400 nm, ~150 fs excitation (left panel) and the ns range after 355 nm, ~0.7 ns excitation (right panel). The spectra evolve in the direction of the arrows. Bottom: DAS spectra corresponding to kinetics components of 4.6±1.1, and 180±90 ps (left panel); 7.1±1, 52.3±6.5, and 1069±142 ns (right panel). The “infinity” DAS results from extrapolation of the ps measurement to long time delays, approximately corresponding to an early-ns spectrum. Solution in 50 mM KPi buffer in D2O (pD ~7.0) at 21 °C.