New ruthenium(II) complexes with pyridylpyrazole ligands. Photosubstitution and /sup 1/H, /sup 13/C, and /sup 99/Ru NMR structural studies

Journal Article · Wed May 11 04:00:00 EDT 1983 · Inorg. Chem.; (United States)

DOI:https://doi.org/10.1021/ic00152a014· OSTI ID:5749294

Steel, P J; LaHousse, F; Lerner, D; Marzin, C

The preparations and properties of ruthenium (Ru) (II) complexes containing the bidentate ligand (L) 1-(2-pyridyl)-3,5-dimethylpyrazole, are described. The tris complex RuL/sub 3//sup 2 +/ is shown to readily undergo photosubstitution in acetonitrile (CH/sub 3/CN) solution to produce RuL/sub 2/(CH/sub 3/CN)/sub 2//sup 2 +/, which in the presence of other bidentate ligands undergoes thermal substitution of the coordinated acetonitrite. /sup 1/H, /sup 13/C, and /sup 99/Ru NMR spectra are reported for all the complexes. Proton and carbon-13 NMR reveal the CH/sub 3/CN presence of geometrical isomerism, where it exists; proton and ruthenium-99 NMR allow the evaluation of the percentage of these isomers. Ruthenium-99 NMR proves to be an excellent probe of electron density at the metal and is possibly useful to evaluate the amount of ..pi..-back-bonding depending on the ligands. Electronic spectral data and oxidation potential measurements are given for comparison with those of the well-known RU(bipyridine)/sub 3//sup 2 +/ complex but do not lead to consistent results. 4 figures, 3 tables.

• OSTI ID: 5749294
• Journal Information: Inorg. Chem.; (United States), Journal Name: Inorg. Chem.; (United States) Vol. 22:10; ISSN INOCA
• Country of Publication: United States
• Language: English

Related Subjects

37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY
400500* -- Photochemistry
ABSORPTION SPECTRA
ACETONITRILE
AMINES
AMMONIUM COMPOUNDS
AZINES
AZOLES
DATA
ENERGY-LEVEL TRANSITIONS
EXCITATION
EXPERIMENTAL DATA
HETEROCYCLIC COMPOUNDS
INFORMATION
IONIZATION
LIGANDS
MAGNETIC RESONANCE
NITRILES
NUCLEAR MAGNETIC RESONANCE
NUMERICAL DATA
ORGANIC COMPOUNDS
ORGANIC NITROGEN COMPOUNDS
ORGANOMETALLIC COMPOUNDS
PHOTOIONIZATION
PYRAZOLES
PYRIDINES
PYRIDINIUM COMPOUNDS
QUATERNARY COMPOUNDS
RESONANCE
RUTHENIUM COMPOUNDS
SAMPLE PREPARATION
SPECTRA
STRUCTURAL CHEMICAL ANALYSIS
TRANSITION ELEMENT COMPOUNDS
ULTRAVIOLET SPECTRA