Synthesis and properties of [Pt(4-CO2CH3-py)2(dmit)] and [Pt(4-NO2-py)2(mnt)]: Exploring tunable Pt dyes
作者:Lucy P. Moorcraft、Lorna A. Jack、James R. Jennings、Laurence M. Peter、Lesley J. Yellowlees、Neil Robertson
DOI:10.1016/j.poly.2009.09.017
日期:2009.12
Two [Pt(II)(substituted-pyridyl)(2)(dithiolate)] dyes with the formulas [Pt(4-CO2CH3-py)(2)(dmit)] and [Pt(4-NO2-py)(2)(mnt)] (where py = pyridyl, dmit = 1,3-dithiol-2-thione-4,5-dithiolate and mnt = maleonitriledithiolate) and their dichloride precursors [PtCl2(4-R-py)(2)] have been synthesized and compared to a previously-reported dye [Pt(4-CO2CH3-py)(2)(mnt)]. Variation of either the pyridyl ligands or the ditholate ligand showed tuning of the electrochemical and spectroscopic characteristics of the dyes as evidenced by cyclic and differential pulse voltammetry, hybrid DFT calculations, UV/Vis spectroelectrochemistry and in situ EPR spectroelectrochemistry. The HOMO was shown to be mostly dithiolate based and the LUMO pyridyl based allowing absorption characteristics to be predictably tuned to longer wavelengths, which is important for optimization of such dyes in applications such as solar energy conversion. (C) 2009 Elsevier Ltd. All rights reserved.
Synthesis and properties of [Pt(4-CO2CH3-py)2(mnt)]: comparison of pyridyl and bipyridyl-based dyes for solar cells
作者:Lucy P. Moorcraft、Ana Morandeira、James R. Durrant、James R. Jennings、Laurence M. Peter、Simon Parsons、Andrew Turner、Lesley J. Yellowlees、Neil Robertson
DOI:10.1039/b811943k
日期:——
The latter point determines that the di-reduced pyridyl complex remains EPR active, unlike the bipyridyl analogue. Complex 3a attached to nanocrystalline TiO(2) shows a long charge recombination lifetime in comparison with the analogous complex with the ubiquitous 4,4'-(CO(2)H)(2)-bipyridyl ligand, suggesting that pyridyl complexes may possess some advantage over bipyridyl complexes in dye-sensitised