Anchor-Functionalized Push-Pull-Substituted Bis(tridentate) Ruthenium(II) Polypyridine Chromophores: Photostability and Evaluation as Photosensitizers
- Title
- Anchor-Functionalized Push-Pull-Substituted Bis(tridentate) Ruthenium(II) Polypyridine Chromophores: Photostability and Evaluation as Photosensitizers
- Author
- 강용수
- Keywords
- Ruthenium; Tridentate ligands; Sensitizers; Photochemistry; N ligands; SENSITIZED SOLAR-CELLS; EMITTING ELECTROCHEMICAL-CELLS; NANOCRYSTALLINE TIO2 FILMS; TRANSITION-METAL-COMPLEXES; EXCITED-STATE; PROTON-TRANSFER; ELECTROLUMINESCENT DEVICES; PHOTOPHYSICAL PROPERTIES; RECOMBINATION KINETICS; CHARGE RECOMBINATION
- Issue Date
- 2014-02
- Publisher
- WILEY-V C H VERLAG GMBH
- Citation
- European Journal of Inorganic Chemistry, 2014, 16, P.2720-2734
- Abstract
- Stable push-pull substituted heteroleptic bis(tridentate) ruthenium(II) polypyridine complexes with COOH or 2,2-bipyridine anchor groups have been prepared and characterized by 1H, 13C and 15N NMR 1D and 2D spectroscopy, infrared spectroscopy, elemental analysis, high-resolution ESI mass spectrometry, electrochemistry, UV/Vis absorption spectroscopy, luminescence spectroscopy, and density functional calculations. The complexes feature a pronounced electronic directionality and high absorption wavelengths up to max = 544 nm extending to 720 nm as a result of favorable push-pull substitutions. A remarkable photostability in the presence of water and coordinating ions (I-) was discovered for the tridentate complexes when compared with the standard ruthenium sensitizer N719 and tris(bidentate) [Ru(bpy)3](PF6)2, which are highly photolabile under the same conditions (photodissociation/photosubstitution). The complexes were studied as photosensitizers in dye-sensitized solar cells. The incident photon-to-current conversion efficiency follows the absorption spectra into the NIR region. However, the high positive charge of the complexes (2+) favors the recombination of the injected electrons with I3- of the redox electrolyte, which is evidenced by high dark currents and short electron recombination lifetimes, leading to low cell performances compared with cells with the negatively charged N719 dye.
- URI
- https://onlinelibrary.wiley.com/doi/abs/10.1002/ejic.201402091
- ISSN
- 1434-1948; 1099-0682
- DOI
- 10.1002/ejic.201402091
- Appears in Collections:
- COLLEGE OF ENGINEERING[S](공과대학) > ENERGY ENGINEERING(에너지공학과) > Articles
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