The excited-state relaxation processes of an amino-substituted triphenylbenzene derivative (p-EE;TP) and its biphenyl-model compound (p-EFBP) were investigated by femtosecond polarized transient absorption spectroscopy. The S-1-S-n absorption was detected upon pumping at 360 nm and probing at 470 nm. Both compounds presented a polarization-dependent component in the transient decay, For p-EFBP a decay time of 97 +/- 20 ps was obtained which agrees with the rotational diffusion time determined by time-resolved fluorescence anisotropy. For the symmetric p-EFTP a decay time of 8 +/- 2 ps was detected. This value correlates with the intramolecular dipole reorientation time deduced from time-resolved microwave conductivity measurements.
Femtosecond polarized transient absorption spectroscopy of a C3-symetric amino substituted phenylbenzene derivative
LATTERINI, Loredana;
1998
Abstract
The excited-state relaxation processes of an amino-substituted triphenylbenzene derivative (p-EE;TP) and its biphenyl-model compound (p-EFBP) were investigated by femtosecond polarized transient absorption spectroscopy. The S-1-S-n absorption was detected upon pumping at 360 nm and probing at 470 nm. Both compounds presented a polarization-dependent component in the transient decay, For p-EFBP a decay time of 97 +/- 20 ps was obtained which agrees with the rotational diffusion time determined by time-resolved fluorescence anisotropy. For the symmetric p-EFTP a decay time of 8 +/- 2 ps was detected. This value correlates with the intramolecular dipole reorientation time deduced from time-resolved microwave conductivity measurements.I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
