Sensitizing the Sensitizer: The Synthesis and Photophysical Study of Bodipy-Pt(II)(diimine)(dithiolate) Conjugates
Citation: Theodore Lazarides, Theresa M. McCormick, Kristina C. Wilson, Soohyun Lee, David W. McCamant, and Richard Eisenberg (2011) Sensitizing the Sensitizer: The Synthesis and Photophysical Study of Bodipy-Pt(II)(diimine)(dithiolate) Conjugates. Journal of American Chemical Society (RSS)
DOI (original publisher): 10.1021/ja1070366
Semantic Scholar (metadata): 10.1021/ja1070366
Sci-Hub (fulltext): 10.1021/ja1070366
Internet Archive Scholar (search for fulltext): Sensitizing the Sensitizer: The Synthesis and Photophysical Study of Bodipy-Pt(II)(diimine)(dithiolate) Conjugates
Download: http://pubs.acs.org/doi/abs/10.1021/ja1070366
Tagged: Chemistry
(RSS)
Summary
This paper is about increasing the light harvesting potential of Pt(II)(diimine)(dithiolate) chromophores by connecting it to a strongly absorbing dye ( ε = 105 M-1 cm-1 ), in this case Boron dipyrrin (Bodipy) dye. Pt(II)(diimine)(dithiolate) complexes have photoabsorption in visible spectrum and thus have long lived charge transfer excited states, which are reductive enough to transfer electrons to nanocrystalline semiconductors like TiO2, thus gives rise to photocurrent. They are also capable of electrontransfer quenching, which can initiate a photocatalytic cycle, which in presence of a sacrificial donor can produce Hydrogen from Water. But still these complexes have modest molar absorptivities. So these are sensitized by attaching the Bodipy dyes. Bodipy dyes exhibit intense absorption and emission in the visible region corresponding to a ππ* excited state, which lies higher in energy than the corresponding charge-transfer energy levels of a typical Pt(II)(diimine)(dithiolate) chromophore. The covalent linkage facilitates energy transfer from dye to mixed metal to ligand charge transfer state of Pt(II) complex. Methods like Transient absorption and Time dependant DFT calculations are used to determine the possible route of connecting the dye to the charge transfer complex so that electron injection into the nanocrystalline TiO2 can be achieved.
