Electronic Spectra of 1‐Phenylethylamine and its Derivatives in Supersonic Jets

Abstract

The S 1 ← S 0 fluorescence excitation spectra and dispersed fluorescence spectra of jet‐cooled (+)‐, (‐)‐ and (±)‐1‐phenylethylamine and their derivatives (amides) have been observed. The 0‐0 band of the amine locates at 37,641 cm‐1. The amides which were synthesized from (+)‐amine or (‐)‐amine with (+)‐tartaric acid are diastereomers. It was found that the two diastereomers give the identical spectra with the 0‐0 band at 34,757 cm -1 . No difference in the spectrum indicates that the excitation is localized in the phenyl group which is far from the asymmetric carbon causing diastereoism. It was also found that 1‐phenylethylamine has a fast nonradiative relaxation process in the Sstate, but such a process is removed by the formation of the amide.