Emissive Ruthenium-Bisdiimine Complexes with Chelated Thioether Donors
Journal article, 2016

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.

Ruthenium

Electrochemistry

LIGAND

ENERGY-GAP LAW

Photophysics

PHOTOCHEMISTRY

NONRADIATIVE DECAY

S ligands

PYRIDYLAMINE COMPLEXES

DELOCALIZATION

OXYGENATION

POLYPYRIDINE COMPLEXES

Synthetic methods

N

PHOTOPHYSICAL PROPERTIES

EXCITED-STATE DECAY

Author

Joachim Wallenstein

Chalmers, Chemistry and Chemical Engineering, Chemistry and Biochemistry, Physical Chemistry

J. Sundberg

University of Southern Denmark

C. J. McKenzie

University of Southern Denmark

Maria Abrahamsson

Chalmers, Chemistry and Chemical Engineering, Chemistry and Biochemistry, Physical Chemistry

European Journal of Inorganic Chemistry

1434-1948 (ISSN)

6 897-906

Areas of Advance

Nanoscience and Nanotechnology (2010-2017)

Subject Categories

Chemical Sciences

DOI

10.1002/ejic.201501256

More information

Latest update

9/6/2018 1