Preparation of an intercalation compound of layered titanic acid H₂Ti₄O₉ with methylene blue

Intercalation of methylene blue into layered titanic acid H₂Ti₄O₉ was examined by a guest exchange method using a propylammonium-H_xTi₄O₉ intercalation compound as the intermediate. Methylene blue cations were arranged in the interlayer space obliquely to the layer surface. The visible spectrum of the intercalation compound suggested that the methylene blue cations were in an associated state in the interlayer space of H₂Ti₄₀₉. The intercalated methylene blue cations underwent a reversible electrochemical redox reaction in the dark, indicating that intercalation compounds of H₂Ti₄O₉ can be applied to a modified electrode.