It has been postulated that 'Frustrated Lewis Pairs' react after associating in an encounter complex held by dispersion forces, and that is it is this complex that interacts, and activates hydrogen, in a bi-molecular fashion. The formation of encounter complexes has been proposed by key theoretical evidence and computational studies, however experimental evidence to support their existence is very limited. In previous beam time a direct experimental observation of the encounter complex between pairs of hindered Lewis acids and bases in solution was achieved. In this work we hope to observe the heterolytic cleavage of hydrogen in solution using the system previously studied.