Collect. Czech. Chem. Commun. 2001, 66, 81-88

Photoelectromotive Force (PEMF) Studies of [Fe(CN)5SCN]3- Complex Ions Adsorbed on Pb(SCN)2 Semiconductor Surfaces

Horst Henniga,*, Athanasios Kokorakisa, Stefan Fränzleb, Cornelia Dammc, Franz W. Müllerc and Gunter Israelc

a Institut für Anorganische Chemie, Universität Leipzig, Johannisallee 29, D-04103 Leipzig, Germany
b Umweltforschungszentrum Leipzig, Permoserstr. 17, D-04103 Leipzig, Germany
c Institut für Organische Chemie, Martin-Luther Universität Halle, Geusaer Str., D-06217 Merseburg, Germany


Adsorbates of [Fe(CN)5SCN]3- complex ions on semiconducting Pb(SCN)2 surfaces were subject to photoelectromotive force (PEMF) investigations. Laser flash excitation of the adsorbates at 560 nm yields a weak PEMF signal due to spectral sensitization of the semiconductor Pb(SCN)2, not absorbing in the visible region. PEMF signals observed with laser flash excitation at 337 nm are explained by hole trapping accompanied with photoinduced redox reactions of the complex, when the number of flashes is increased.

Keywords: Photo EMF; Semiconductors; Transition metal complexes; Charge transfer; Photochemistry; Thiocyanates; Lead; Iron.

References: 9 live references.