A dielectric and spectrophotometric study of the tautomerization of 2-hydroxypyridine and 2-mercaptopyridine in water.

The basic ionization (p ) and acidic ionization (p ) constants and equilibrium constant ( ) of 2HPy and 2MPy were determined. The p (s) of their - and -methyl derivatives (X = O, S) were also determined. The equilibrium constant of 2MPy is approximately 60 times greater than its oxygen analog, 2HPy.