Influence of the pyridine ligands nature and corresponding Ruthenium (II) dye molecular structure on the performance of dye sensitized solar cells Georgia Konti , Evagelia Chatzivasiloglou, Vlassis Likodimos, George Kantonis, Athanassios G. Kontos, Athanassios I. Philippopoulos ∗ and Polycarpos Falaras ∗ Electronic Supplementary Information Experimental. 1. a) General Procedures and Materials b) Synthesis of the sensitizers c) TiO 2 electrode preparation and solar cell fabrication 2. Energetic diagrams of the interface 3. Figure S1. Raman spectra for complexes 6 and 7 and the corresponding dye sensitized titania films. 1a) General Procedures and Materials The C, H, N analyses were carried out on a Perkin Elmer 2400 CHN elemental analyzer. Infrared spectra were measured with a Nicolet 550 Magna-IRTM spectrometer in KBr pellets in the region of 4000–400 cm –1 . Micro-Raman spectra were measured in backscattering configuration using a Renishaw inVia spectrometer with an Ar + ion laser (λ=514.5 nm) and a high power near infrared (NIR) diode laser (λ=785 nm) as excitation sources. In all cases, very low laser power density (0.2-0.4 mW/μm 2 ) was applied to avoid dye degradation. The luminescence background has been subtracted from all spectra by polynomial fitting and/or cubic spline interpolation routines. Absorption spectra in solution (1 × 10 -5 M in EtOH) were recorded with a Perkin–Elmer Lambda 19 UV/Vis spectrometer. Diffuse reflectance UV/Vis spectra of the dye sensitized TiO 2 films normalized to that of a blank titania film, were obtained on a Hitachi 3010 spectrophotometer equipped with an integrating sphere. 1 H NMR spectra were measured with a Bruker Avance 500 MHz spectrometer in (CD 3 ) 2 SO, CD 3 OD, CD 3 CN and D 2 O. J values are given in Hz. Electrospray Supplementary Material (ESI) for Photochemical & Photobiological Sciences This journal is © The Royal Society of Chemistry and Owner Societies 2009