Femtosecond fluorescence transients (open circles) of 4e in CH2Cl2 at room temperature observed at 460 nm (a, f), 500 nm (b, g), 540 nm (c, h), 580 nm (d, i), and 620 nm (e, j) as depicted in 10 ps and 30 ps time scales. The solid lines in the figure denote the fitting curves. The excitation wavelength is 380 nm. The fitting results are tabulated in Table 1.