Fig. 9. Top: rate dependence on substrate concentration of reactions of (A) 1^(IV) NTs (left) with ^MeOPhSMe substrate (denoted as [S]) and (B) 2^(IV) NTs with ^MeOPhSMe substrate (right) at 293 K. Bottom: Hammett plot representing log(k_X/k_H) against Hammett parameter (σ_p) for the reactions of (C) 1^(IV) NTs (left) and (D) 2^(IV) NTs (right) with p-X-thioanisoles in acetonitrile at 293 K. k_x values correspond to the second order rate constants obtained by measuring k_obs values at different p-X-thioanisole concentrations.