Polyaza cavity shaped molecules. 11. Ruthenium complexes of annelated 2,2'-biquinoline and 2,2'-bi-1,8-naphthyridine
Ruthenium(II) complexes of the type RuL/sub 3/(PF/sub 6/)/sub 2/ and Ru(bpy)/sub 2/L(PF/sub 6/)/sub 2/ have been prepared, where bpy = 2,2'-bipyridine and L is a 3,3'-polymethylene-bridged derivative of 2,2'biquinoline or 2,2'-bi-1,8-naphthyridine. Effects associated with steric crowding and nonplanarity of the bridged ligands are reflected in the coordination geometry of the RuL/sub 3//sup 2 +/ complexes. These effects can be partially evaluated by consideration of NMR shielding effects and interpretation of /sup 1/H spin-spin couplings along the polymethylene bridge. The energies of the long-wavelength MLCT absorption are sensitive to the delocalizing ability of the ligand as well as the effectiveness of coordination as dictated by steric effects. Varying the dihedral angle of the 1,4-bidentate chelating moiety affects the intensity more than the energy of charge transfer to the ligands. The oxidation potentials for the tris(biquinoline) complexes are more positive than for Ru(bpy)/sub 3//sup 2 +/ while those of the tris(binaphthyridine) complexes are more negative. 22 references, 7 figures, 5 tables.
- Research Organization:
- Univ. of Houston, TX
- OSTI ID:
- 6868752
- Journal Information:
- Inorg. Chem.; (United States), Journal Name: Inorg. Chem.; (United States) Vol. 26:5; ISSN INOCA
- Country of Publication:
- United States
- Language:
- English
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37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY
400201* -- Chemical & Physicochemical Properties
AROMATICS
AZAARENES
AZINES
BIPYRIDINES
CHEMICAL REACTIONS
COMPLEXES
DATA
EXPERIMENTAL DATA
HETEROCYCLIC COMPOUNDS
INFORMATION
MAGNETIC RESONANCE
NUCLEAR MAGNETIC RESONANCE
NUMERICAL DATA
ORGANIC COMPOUNDS
ORGANIC NITROGEN COMPOUNDS
ORGANOMETALLIC COMPOUNDS
OXIDATION
PYRIDINES
QUINOLINES
RESONANCE
RUTHENIUM COMPLEXES
STEREOCHEMISTRY
TRANSITION ELEMENT COMPLEXES