Emissive Ruthenium-Bisdiimine Complexes with Chelated Thioether Donors
Artikel i vetenskaplig tidskrift, 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.

PHOTOPHYSICAL PROPERTIES

NONRADIATIVE DECAY

PYRIDYLAMINE COMPLEXES

DELOCALIZATION

Ruthenium

EXCITED-STATE DECAY

OXYGENATION

N

Photophysics

S ligands

PHOTOCHEMISTRY

LIGAND

POLYPYRIDINE COMPLEXES

Electrochemistry

Synthetic methods

ENERGY-GAP LAW

Författare

Joachim Wallenstein

Kemi och kemiteknik, Kemi och biokemi, Fysikalisk kemi

J. Sundberg

Syddansk Universitet

C. J. McKenzie

Syddansk Universitet

Maria Abrahamsson

Kemi och kemiteknik, Kemi och biokemi, Fysikalisk kemi

European Journal of Inorganic Chemistry

1434-1948 (ISSN)

897-906

Styrkeområden

Nanovetenskap och nanoteknik

Ämneskategorier

Kemi

DOI

10.1002/ejic.201501256