A series of ruthenium(II) complexes with the pyrazolylalkane ligands bis(pyrazol-1-yl) methane (BPM) (I) and bis(3,5-dimethylpyrazol-1-y1)methane (dmBPM) (II), and the imidazolylalkane ligand bis(N-methylimidazol-2-yl)methane (BIM) (III) have been synthesised and characterised. The complexes [Ru(N-N)(CO)2X2] [N-N = BPM, X = Cl (1a), Br (1b); N-N = dmBPM, X = Cl (2); N-N = BIM, X = Cl (3)] were prepared from the stoichiometric reaction of [Ru(CO)2X2]n and the bidentate N-donor ligand in refluxing methanol. The crystal structure of 2 showed the complex to have octahedral geometry about the ruthenium centre, with the carbonyl and chloride ligands being coordinated cis and trans, respectively. The complex [Ru(BPM)2(CO)(Cl)][BPh4] (4) was prepared from the reaction of RuCl3 and BPM in refluxing DMF, or from the decarbonylation of [Ru(BPM)(CO)2Cl2] (1a) in the presence of BPM and NaBPh4. The NMR spectra of 4 were fully assigned from 2D NMR experiments. The NOESY showed a cis coordination of the chloride and carbonyl ligands, and this was confirmed by single crystal X-ray diffraction studies.
|Number of pages||8|
|Journal||European Journal of Inorganic Chemistry|
|Publication status||Published - Jan 2003|