7.

Pseudo-first order rate plots for V ₆ O ₆ Cl ^– (blue) and V ₆ O ₆ SCN ^– (purple), with excess H₂Phen in MeCN at 25 °C. The reaction with V ₆ O ₆ Cl ^– was held at a constant POV-alkoxide concentration of 0.5 mM, with H₂Phen varied between 5 and 11.2 mM. V ₆ O ₆ SCN ^– is held at concentration of 0.75 mM, with H₂Phen varied between 7.5 mM and 15 mM. Linear regressions are calculated with a fixed intercept at the origin.