Synthesis, Characterization and Electronic Properties of trans-[4-(Alkoxycarbonyl)phenyl]porphyrin-[RuII(bpy)_3]_2 Complexes or Boron-Dipyrrin Conjugates as Panchromatic Sensitizers for DSSCs

摘要

Two porphyrin-based dyes were synthesized that incorporate two additional chromophores to absorb in a wider UV/Vis region. In the first dye, a porphyrin ring is linked through an amide bond to two [Ru(bpy)_3]~(2+) units, forming a symmetric[Ru(bpy)_3]-porphyrin-[Ru(bpy)_3] {Por(COOH)_2[Ru(bpy)_3]_2} system. The second porphyrin is trans substituted through a triple bond to the meso position with two boron dipyrrin (BDP) molecules {Por(COOH)_2(BDP)_2}. Both porphyrins bear two carboxylic groups capable of binding onto a TiO_2 surface,with potential applications in dye-sensitized solar cells(DSSCs). The title dyes were characterized by means of ~1H and ~(13)C NMR spectroscopy, elemental analysis, MALDI-TOF,UV/Vis absorption and emission studies.