Interrelationship between the Ancillary Ligand Structure, Acid-Base Properties, and TiO2 Surface Coverage of Ru-II Dyes

Autor(es)

Veiga, Elaine Teixeira ; Mueller, Andressa Vidal ; Ramos, Luiz Duarte ; Morelli Frin, Karina Passalacqua ; Polo, Andre Sarto

• Tipo de documento: Artigo Científico
• Fonte: European Journal of Inorganic Chemistry; v. N/A, n. 23, p. 9-pg., 2018-06-22.

Resumo

The effect of donor/acceptor substituents of phenanthroline on the ground and excited state pK(a) of Ru-II tris-heteroleptic compounds, such as cis-[Ru(R-phen)(dcbH(2))(NCS)(2)], where R = H, Me-2, Me-4, Ph-2, and Cbz(2), was investigated, as well as their effect on dye adsorption on a TiO2 surface. It was determined that, aside from the long distance between the substituent and acid site on the molecule, the pK(a) followed the same trend found for uncoordinated ligands; slightly higher pK(a) values were determined for compounds with donor substituents. A linear correlation suggested that the acid-base properties of the dyes have a direct relationship to the amount of dye adsorbed onto the TiO2 surface as well as their molecular volumes. Solar cells prepared using such dyes exhibited IPCE values up to 77% at 520 nm. These results are important for understanding the effect of ancillary ligands on the acid-base properties of ruthenium compounds and the TiO2 surface coverage, which can lead to the development of new and efficient dyes for energy conversion devices. (AU)

• Processo FAPESP: 16/25900-2 - Desenvolvimento de células solares a base de perovskitas
• Beneficiário: Elaine Teixeira Veiga
• Modalidade de apoio: Bolsas no Brasil - Mestrado
• Processo FAPESP: 17/18063-0 - Avaliação de compostos luminescentes de Re(I) em bioimagem e/ou como agentes antitumorais
• Beneficiário: Karina Passalacqua Morelli Frin
• Modalidade de apoio: Auxílio à Pesquisa - Regular
• Processo FAPESP: 16/24020-9 - Avaliação de processos fotoassistidos por compostos polipiridínicos de Ru(II) e re(i)
• Beneficiário: Andressa Vidal Muller
• Modalidade de apoio: Bolsas no Brasil - Doutorado
• Processo FAPESP: 16/21993-6 - Avaliação de compostos polipiridínicos de Ru(II) e Re(I) em dispositivos fotoativos
• Beneficiário: André Sarto Polo
• Modalidade de apoio: Auxílio à Pesquisa - Regular