Theoretical study of triplet-triplet absorption spectra of mono andp-di-substituted benzenes with electron-donating substituents

N,N-Dialkylanilines: The S1 State Absorption Spectrum and Efficient Intramolecular Triplet−Triplet Energy Transfer to an Olefinic Bond

“…In connection with this, and also for other reasons, the photophysical properties of the chromophore have been the subject of numerous investigations. Among these are studies on the ground-state UV absorption, − fluorescence, , triplet absorption, − phosphorescence, ,− and excited-state dipole moments. − Despite all these studies, the excited state properties of the dialkylanilino chromophore have not yet been completely disclosed.…”

Flash photolysis study of 4-N-dimethylaminopyridine

“…25 The T-T absorption of 4-DMAMP observed at -180°i n EPA is best described as an intramolecular charge transfer T-T absorption, according to the theoretical model of Kimura. 26 For the purpose of comparison to other aromatic amines, the flash photolysis of iV-dimethyl-/3naphthylamine in cyclohexane yields a triplet-triplet absorption with XTOax 475 nm, while the molecular cation appears at 535 nm. 27 The lack of any observable T-T absorption in a nonpolar solvent is rather surprising, especially since the phosphorescence lifetime in 3-MP at 77°K is 0.32 sec.…”