Studies on positronium–glycine complex formation using a positron annihilation lifetime spectrometer with BaF2 detectors

Abstract

Complex formation between positronium and glycine derivatives in solutions of 30%(v/v) ethanol–water and 20%(v/v) dioxane–water is discussed. A positron annihilation lifetime spectrometer with BaF₂ detectors is described. By means of this apparatus, the complex formation reaction rate constants are obtained. The results indicate that rate constants mainly depend on the conjugation effect at the benzene ring, the induction effects of the substituents on the phenyl and the solvents. There is a linear free-energy relationship between rate constants and the basicities of N-substituted phenyl glycines in ortho-positronium–glycine complex formation.