Generation of the organo-rare gas dications HCCRg2+ (Rg = Ar and Kr) in the reaction of acetylene dications with rare gases.
Using doubly ionized acetylene as a superelectrophilic reagent, the new rare-gas compounds HCCAr2+ and HCCKr2+ have been prepared for the first time in hyperthermal collisions of mass-selected C2H2(2+) with neutral rare gases (Rg). However, electron transfer from the rare gas to the acetylene dication as well as proton transfer from C2H2(2+) to the rare gas efficiently compete with formation of HCCRg2+. The computational investigations show that the formation of HCCRg2+ from acetylene dication is endothermic with Rg = He, Ne, Ar and Kr and only weakly exothermic with Xe. These energetic factors, as well as the pronounced competition with the other reactive channels help to explain why HCCRg2+ is only observed with Rg = Ar and Kr.
Ascenzi
Daniela
D
Department of Physics, University of Trento, Via Sommarive 14, 38100 Povo, Trento, Italy. ascenzi@science.unitn.it
Tosi
Paolo
P
Roithová
Jana
J
Ricketts
Claire L
CL
Schröder
Detlef
D
Lockyear
Jessica F
JF
Parkes
Michael A
MA
Price
Stephen D
SD