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Title: Substituted pyridine ligands for use in solar cell dyes
Author: Moorcraft, Lucy
Awarding Body: University of Edinburgh
Current Institution: University of Edinburgh
Date of Award: 2008
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The platinum complex [Pt(4-CO2CH3-py)2(mnt)] was synthesised and characterised. The acid analogue [Pt(4-CO2H-py)2(mnt)] was also prepared and tested in a dye-sensitised solar cell. An IPCE of 0.5% at 450 nm and a recombination half-life of 3.0 x 10-2 s were obtained. These results were compared to the previously studied [Pt{4,4’-(CO2H)-2,2’-bipy}(mnt)] and [Pt{3,3’-(CO2CH2CH3)-2,2’-bipy} (mnt)] platinum dyes to see the influence of replacing the commonly used 2,2’-bipyridine ligand with two substituted pyridine ligands. An alternative [Pt(diimine)(dithiolate)] complex, [Pt(4-CO2R-py)2(dmit)], (where R = H and CH3) was also synthesised, characterised and tested in a solar cell which had an IPCE of 0.7% at 450 nm. The nitropyridine platinum complex [Pt(4-NO2-py)2(mnt)] was prepared, characterised and tested in a solar cell. The nitro group replaced the more common acid linker group that binds a sensitiser to titania. This dye did sensitise to TiO2 but not as effectively as the acid groups and was easily desorbed. An IPCE of 0.6% at 450 nm was obtained. The complex [Ru(4-CO2R-py)4Cl2] (where R = H and CH3) was synthesised, characterised and tested in a solar cell. This ruthenium-pyridyl complex gave high extinction coefficients in the visible region of 25,000 and 17,000 M-1 cm-1. The solar cell for this compound gave η = 5.8 x 10-3% and an IPCE of 1.6% at 420 nm. Substituted pyridines with the general formula n-X-py, where X = NO2, CO2H, CN, CO2CH3, CO2CH2CH3, Ph, NH2 or CHO and n = 2, 3 or 4, were studied using electrochemistry and the effect of substitution group, substitution position and complexation to a metal centre on their E1/2 potentials was determined. The effect of different solvents, and of water, on this potential was also investigated.
Supervisor: Not available Sponsor: Not available
Qualification Name: Thesis (Ph.D.) Qualification Level: Doctoral
EThOS ID:  DOI: Not available