The relaxation times (τ) of water and rate constants, k_f and k_b, of tautomerization (A ⇌ B) in aqueous solutions of 2HPy and 2MPy.

Compounds	τ (ps)	k f (in s−1)	k b (in s−1)
2HPy	8.02(3)	(1.24 ± 0.05) × 1011	(1.36 ± 0.04) × 108
2MPy	8.19(2)	(1.22 ± 0.04) × 1011	(2.18 ± 0.04) × 106