Fig. 3. Characterization of the [Fe(py)2{Pt(CN)4}] ultrathin film as a function of the number of cycles. (a) IRRAS spectra after successive immersion cycles. Abbreviations: ν, stretching; δ, in-plane bending; br, breathing. (b) Maximum absorbance of the most intense peak, ν(CN) at 2173 cm–1versus the number of cycles. Data have been fitted to a linear model (black line). (c) Maximum absorbance of the most intense ν(py ring) peak, at 1604 cm–1versus the number of cycles. Data have been fitted to a linear model (black line). High-resolution XPS spectra for a set of films and the bulk reference showing the Fe 2p (d) and Pt 4f (e) regions. (f) The Pt/Fe ratio remains almost constant and is consistent with the theoretical value (dashed grey line) for successive immersion cycles.
