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.