Abstract
Vibrational data on the first excited singlet state (S 1 ) of N,N,N',N'-tetramethylbenzidine (TMB) and N,N,N',N'-tetramethyl-p-phenylenediamine (TMPD) have been obtained by using picosecond time-resolved Raman spectroscopyfor different isotopic derivatives and for the N,N,N',N'-tetraethyl analogues, TEB and TEPD. Reliable vibrational assignments are proposed. On this basis, the S 1 state structure and electronic configuration of these diamines are discussed and compared with the results previously reported for the ground state, the lowest excited triplet state, and the radical cation species.
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