Conformational dynamics of semiflexibly bridged donor-acceptor systems studied with a streak camera and spectrotemporal parametrization of fluorescence
Xy. Lauteslager et al., Conformational dynamics of semiflexibly bridged donor-acceptor systems studied with a streak camera and spectrotemporal parametrization of fluorescence, J PHYS CH A, 103(6), 1999, pp. 653-659
The fluorescence of four semiflexibly bridged donor-bridge-acceptor systems
was studied with a streak camera system. The information-rich streak data
make a detailed analysis possible of both the kinetics and the spectral cha
nges that take place. From the analysis, it follows that: all compounds stu
died undergo a photoinduced harpooning process in which long-range electron
transfer creates an extended charge-transfer (ECT) species, which converts
to a compact charge-transfer (CCT) species due to Coulombic attraction. Bo
th the ECT and CCT species display CT fluorescence. The harpooning process
occurs even in solvents of medium polarity (e.g., diethyl ether), whereas i
t has previously been assumed for related compounds that this process only
occurs in the gas phase and in nonpolar alkane solvents.