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Emissive Ruthenium-Bisdiimine Complexes with Chelated Thioether Donors

Joachim Wallenstein (Institutionen för kemi och kemiteknik, Fysikalisk kemi) ; J. Sundberg ; C. J. McKenzie ; Maria Abrahamsson (Institutionen för kemi och kemiteknik, Fysikalisk kemi)
European Journal of Inorganic Chemistry (1434-1948). 6, p. 897-906. (2016)
[Artikel, refereegranskad vetenskaplig]

The photophysical properties of ruthenium(II) complexes of bidentate 2-[(alkylthio)methyl]pyridine (N,S) ligands have been systematically investigated. The co-ligands in the heteroleptic complexes were diimines (N,N ligands, e.g., bpy, phen) or tripodal tetradentate tris(2-pyridylmethyl)amine (tpa). Their X-ray structures revealed little variation in the Ru-S (2.31-2.33 angstrom) and Ru-N (2.06-2.11 angstrom) bond lengths. Despite this, considerable variation can be observed in the electrochemistry and spectroscopy measurements. The presence of the thioether sulfur donor results in a shift to a more positive potential of the Ru2+/Ru3+ process, and the absorption maxima are consequently blueshifted in [Ru(N,N)(2)(N,S)](2+) complexes compared with the [Ru(N,N)(3)](2+) analogues. The [Ru(N,N)(2)(N,S)](2+) complexes display strong room-temperature emission from (MLCT)-M-3 states, governed by the N,N donors. This is corroborated by low-temperature steady-state emission studies, which revealed typical (MLCT)-M-3 emission profiles and excited-state lifetimes of around 5-10 mu s.

Nyckelord: Synthetic methods; Electrochemistry; Photophysics; Ruthenium; N,S ligands; EXCITED-STATE DECAY; ENERGY-GAP LAW; PHOTOPHYSICAL PROPERTIES; PYRIDYLAMINE COMPLEXES; POLYPYRIDINE COMPLEXES; NONRADIATIVE DECAY; LIGAND; DELOCALIZATION; PHOTOCHEMISTRY; OXYGENATION



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Denna post skapades 2016-04-06. Senast ändrad 2017-09-14.
CPL Pubid: 234238

 

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