The decay profiles of the q-ax. band shown in Figure also show a double exponential decay both in toluene and in THF but the peak position of the band is red-shifted at the longer delay time as shown in Figures . Because the shorter lifetime is estimated to be shorter than the instrument response function (IRF ~ 1 ns), the faster process in the excited state occurs in less than 1 ns. Since the structural change from q-ax. to q-eq. occurs in less than 1 ns , the shorter lifetime is at least partially attributed to this structural change. In contrast to the q-eq. band, the longer lifetime is not components of the q-ax. band in toluene (a), the q-eq. band in toluene (b), and the q-ax. band in THF (c). (d-f) Time profiles of TR-PL spectra of the q-eq. band up to 15 ns (d) and 1000 ns (d)