Chromium exchange between chromium(II) and benzylchromium(III) ions

Abstract

The rate of first-order hydrogen-ion independent chromium isotope exchange between benzylchromium(III) and chromium(II) ions is 1.2 × 10−2 M−1 s−1 at 0°C in a 70% methanol-water solvent, ΔS≠ = −28.5 eu, ΔH≠ = 10.3 kcal M−1. For the corresponding exchange between benzylchromium(III) and p-chlorobenzylchromium(III) ions, these figures are 1.2 × 10−3M−1 s−1, −32.2 eu, and 10.9 kcal M−1.