K. Kinashi et al. / Journal of Photochemistry and Photobiology A: Chemistry 217 (2011) 35–39
39
cence lifetimes heavily depended on the viscosity of the medium.
The results suggest that the non-radiative process from S1 of the
PMC-form is closely related to structural relaxation. Comparison
of the lifetimes of PMC and PMCAz indicated significant dynamics.
The non-radiative process from the S1 of the PMC-form to the inter-
mediate state in PMCAz occurred more easily than that in PMC. One
possible consideration is that the bulky Az moiety in PMCAz seems
to inhibit the non-radiative process. Moreover, it is unlikely that
energy transfer from PMC moiety to Az moiety could occur.
It is concluded that SpAz has four clear digital codes and that
there is potential for using it for the fabrication of multi-addressable
systems and molecular switching for optical memories.
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