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Interrelationship between the Ancillary Ligand Structure, Acid–Base Properties, and TiO 2 Surface Coverage of Ru II Dyes
Author(s) -
Teixeira Veiga Elaine,
Vidal Müller Andressa,
Duarte Ramos Luiz,
Passalacqua Morelli Frin Karina,
Sarto Polo André
Publication year - 2018
Publication title -
european journal of inorganic chemistry
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.667
H-Index - 136
eISSN - 1099-0682
pISSN - 1434-1948
DOI - 10.1002/ejic.201701476
Subject(s) - chemistry , ruthenium , substituent , adsorption , molecule , ligand (biochemistry) , base (topology) , acceptor , excited state , photochemistry , inorganic chemistry , catalysis , stereochemistry , organic chemistry , mathematical analysis , biochemistry , physics , receptor , mathematics , nuclear physics , condensed matter physics
The effect of donor/acceptor substituents of phenanthroline on the ground and excited state p K 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 TiO 2 surface. It was determined that, aside from the long distance between the substituent and acid site on the molecule, the p K a followed the same trend found for uncoordinated ligands; slightly higher p K 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 TiO 2 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 TiO 2 surface coverage, which can lead to the development of new and efficient dyes for energy conversion devices.