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Franck-Condon excited state dipoles and polarizabilities of tetraphenylpenta- tetraene (TP PT ) and t etrakis-(2-met hoxyphenyl )-pent atetraene (0 MTP PT) have been investigated by means of electrooptical absorption measurements (EOAM) in cyclohexane solution at 298K. The optical absorption spectra of TPPT and OMTPPT show two well separated bands at-X N 340 nm (strong) and X N 420 nm (weak) which can be ascribed to the aa*l1B2+l1AI transition (allowed) and the aa'*l1A2tl1dI transition forbidden . The EOA experiment their a+* excited states. These dipoles are parallel to the long molecular axis and to the transition dipole. reveals excited state dipoles of 5 and 7 x 10- I Cm for 1 PPT and OMTPPT in

Photoinduced charge separation and broken symmetry in Franck-Condon excited ππ'* states of tetraphenylpentatetraenes