COMPARISON OF K(PS) VALUES IN PURE PENTENE ISOMERS AND IN ABS ETOH CIS-2-PENTENE/PT, ABS ETOH/CIS-2-PENTENE/PT-ON-CHARCOAL AND D2O MIXTURES/

k(PS) values are an indication of o-Ps reactivity in molecular media v ia pseudo first order kinetics. Although pure pentene isomers exhibit similar o-Ps annihilation characteristics, cis-2-pentene shows rather unusual behavior when mixed with abs. EtOH and a heavy metal catalyst. In this study, comparison of k(PS) values in pure 1-pentene, trans-2- pentene and cis-2-pentene isomers with those for various abs. EtOH/pen tene isomers/Pt, abs. EtOH/pentene isomer/Pt-on-charcoal and D2O/Pd mi xtures will serve to further characterize o-Ps behavior in molecular l iquids. The k(PS) values will also be indirectly related to catalytic activity of Pt and Pt-on-charcoal.