Fig. 6: Time-resolved spectroscopy studies.
a Two-dimensional pseudo-color femtosecond TA spectra of the in-situ generated Cu-1 complex (λpump = 400 nm). b Time-slicing TA spectra at selected pump-probe delays. c Single-wavelength TA (ΔA) kinetics probed at 460 nm (upper panel) and at 380 nm (lower). The kinetics at 460 nm in the presence of varying concentrations of quencher (iodocydohexane) are also shown for comparison. d Two-dimensional pseudo-color nanosecond TA spectra of the in-situ generated Cu-1 complex (λpump = 355 nm). e Steady-state emission spectra of the in-situ generated Cu-1 complex (excitation at 375 nm, 80 K). f Long-lived luminescence decay for the in-situ generated Cu-1 complex measured at 80 K (excitation at 375 nm). g TA kinetics at 380 nm of the in-situ generated Cu-1 complex (gray line). TA kinetics in the presence of quencher (red), MTBD (blue) and quencher plus MTBD (green) are also shown for comparison. h TA lifetime plotted as a function of the quencher concentration. i Proposed scheme for the intersystem crossing of the Cu-1 complex and its inner-sphere SET to attached alkyl halide.
