Structural Investigation in Solution of a series of five-Coordinate Bisphosphinoaryl Ruthenium(II) Complexes

Abstract

The structure of the ruthenium(II) complexes [RuCl{C6H2(CH2PPh2)2-2,6-R-4}(PPh3)] [R = H (1), Ph (2) or Br (3)] was investigated in solution using two-dimensional NMR techniques (1H-1H-, 13C-1H- and 31P-1H-correlation NMR spectroscopy and 1H NOESY). The 1H and 13C NMR spectra of the complexes 1-3 were similar and could be completely assigned. The results of the NOESY study indicated that these complexes have a distorted square-pyramidal geometry in solution as was established for the parent complex R = H in the solid state by an X-ray crystal structure determination. The strategies used for the interpretation of the 1H, 13C and 31P NMR spectra of these compounds and the resulting assignments form the basis for future in situ studies involving these complexes in catalytic processes. Supporting information for this article is available on the WWW under http://www.wiley-vch.de/contents/jc_2005/2000/99478_s.pdf or from the author.