Luminescence of ruthenium(II) tris chelate complexes containing the ligands 2,2'-bipyridine and 2,2'-biisoquinoline. Behavior of the Ru(bpy)/sup 2 +/ and Ru(bpy)/sub 2//sup 2 +/ emitting units
The absorption spectra, emission spectra, emission lifetimes, and the temperature dependence of the emission intensity and lifetime (between 84 and 330 K) of the complexes Ru(bpy/sub 9/''(i-biq)/sup 2 +/, Ru(bpy)(i-biq)/sub 3//sup 2 +/, and Ru(i-biq)/sub 3//sup 2 +/ (bpy = 2,2'bipyridine, i-biq = 2,2'-biisoquinonline) have been studied and compared with those of the previously studied Ru(bpy)/sub 3//sup 2 +/. The electrochemical behavior of the same complexes has also been investigated. The spectroscopic results show that the i-biq ligand is not involved in low-energy excited states that are responsible for the luminescence emission of the mixed-ligand complexes, and the electrochemical data show that the presence of one or two i-biq ligands affects only slightly the density of charge on the Ru ion compared with the situation found for Ru(bpy)/sub 3//sup 2 +/. Ru(bpy)/sub 2/(i-big)/sup 2 +/ can thus be regarded as containing the Ru(bpy)/sup 2 +/ emitting unit in situation that, except for ligand-ligand interaction, is essentially the same as that experienced by such a unit in the Ru(bpy/sub 2/(i-biq)/sup 2 +/ and Ru(bpy)/sub 3//sup 2 +/ complexes. The electrochemical and spectroscopic results suggest Ru(bpy)(i-biq)/sub 2//sup 2 +/, Ru(bpy)/sub 2/(i-biq)/sup 2 +/, and Ru(bpy)/sub 3//sup 2 +/ can all be described as containing single-bpy-localized excited states but that in the last two complexes there is a weak bpy interligand interaction. 68 references, 7 figures, 2 tables.
- Research Organization:
- Univ. of Bologna, Italy
- OSTI ID:
- 5738396
- Journal Information:
- Inorg. Chem.; (United States), Journal Name: Inorg. Chem.; (United States) Vol. 24:2; ISSN INOCA
- Country of Publication:
- United States
- Language:
- English
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ABSORPTION SPECTRA
AROMATICS
AZAARENES
AZINES
BIPYRIDINES
CHARGE DENSITY
CHELATES
CHEMISTRY
COMPLEXES
DATA
ELECTROCHEMISTRY
ELECTRONIC STRUCTURE
EMISSION SPECTRA
ENERGY LEVELS
EXCITED STATES
EXPERIMENTAL DATA
HETEROCYCLIC COMPOUNDS
INFORMATION
LIFETIME
LIGANDS
LOW TEMPERATURE
LUMINESCENCE
MEDIUM TEMPERATURE
NUMERICAL DATA
ORGANIC COMPOUNDS
ORGANIC NITROGEN COMPOUNDS
PYRIDINES
QUINOLINES
RUTHENIUM COMPLEXES
SPECTRA
TEMPERATURE DEPENDENCE
TRANSITION ELEMENT COMPLEXES