AN IN-SITU FT-IR STUDY ON PHOTOCATALYTIC REACTION AT SEMICONDUCTOR-AQUEOUS SOLUTION INTERFACE - MECHANISM OF PHOTOCATALYTIC N-CYCLIZATION OF (S)-LYSINE

Photoinduced reaction occurring at an aqueous solution-semiconductor i nterface was analyzed in situ by reflection FT-IR spectroscopy. The ph otoinduced reflection spectral change, Delta R (= (R-R(0))/R(0)), was recorded by using an IR cell consisting of a semiconductor (TiO2 or Cd S) thin film electrode, a thin layer of aqueous (S)-lysine solution, a nd a calcium fluoride window. Structure of adsorbed substrate and mech anism of photoinduced reaction were discussed.