Observation of dynamic molecular behavior in a phase transfer catalytic reaction at a liquid/liquid interface by using the time-resolved quasi-elastic laser scattering method

The dynamic behavior of the phase transfer catalyst, quaternary ammonium br omide R4N+Br- (R: n-C4H9, n-C3H7, C2H5), at a water/nitrobenzene (W/NB) int erface was monitored by time-resolved quasi-elastic laser scattering (QELS) measurements. The time courses of the QELS spectrum after injection of the (n-C4H9)(4)N+Br- phase transfer catalyst, which brings about high product yield, showed high interfacial molecular number density in the stationary s tate of the reaction, whereas its adsorption rate in the initial stage was almost the same as the rates of the other two. The product yield was consid ered to reflect the interfacial amount of the phase transfer catalyst, and the interface acted as the reaction site controlling the phase transfer cat alytic reaction.