Spectroscopy of jet-cooled tyrosine derivatives

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Abstract
Using fluorescence‐based techniques (excitation and emission spectra lifetimes), we have studied the jet‐cooled tyrosine derivatives tyramine and 3‐(4‐hydroxyphenyl) propionic acid (HPA). For solvent addition resulting in small, mainly one adduct complexes, there is a high degree of analogy with the results for the corresponding analogs of the amino acid tryptophan. In particular, for tyramine, as had been the case with its tryptophan analog tryptamine, addition of one ‐OH bearing solvent molecule at the α‐amine apparently results in a complex in a single conformation.