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J. Phys. Chem. B 2003, 107, 7376-7386
Parameters Affecting Electron Injection Dynamics from Ruthenium Dyes to Titanium Dioxide Nanocrystalline Thin Film† John B. Asbury,‡ Neil A. Anderson, Encai Hao,§ Xin Ai, and Tianquan Lian* Department of Chemistry, Emory UniVersity, Atlanta, Georgia 30322 ReceiVed: January 19, 2003; In Final Form: April 8, 2003
Electron injection rates from Ru(dcbpy)2(X)2 [X ) 2NCS, 2CN, and dcbpy; dcbpy ) 2,2′-bipyridine-4,4′carboxylate] (called Ru535 or Ru N3, Ru505, and Ru470) to TiO2 nanocrystalline thin films are examined as a function of adsorbate redox potential, pH of the solution, excitation wavelength, and solvent. For all three dyes, the injection kinetics are biphasic, consisting of a distinct ultrafast component (
