The thermal self-exchange reaction of Co(en)? and Co(en)?+ in aqueous solution at 65 OC and ionic strength 0.5 mol L-' proceeds by a homogeneous and a minor heterogeneous path, both of which are accelerated by applied pressure (0.1-207 MPa). For the homogeneous path, the logarithmic plot of the bimolecular rate constant k against pressure P is best described as nonlinear, as theory requires, with a volume of activation A P of -20 cm3 mol-] at 0.
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