Metal complexes of sulphur ligands. Part 20. Reaction of bis-(dimethylphenylphosphine)bis(monothiobenzoato)ruthenium(II) with some bidentate nitrogen-donor Lewis bases and X-ray structural analyses on two isomers of bis(dimethylphenylphosphine)bis(monothiobenzoato)(1,10-phenanthroline)ruthenium(II)

Abstract

Reaction of [Ru(SOCPh)₂(PMe₂Ph)₂](1) with ethylenediamine (en) in ethanol (1 : 1 molar ratio) gives [Ru-(SOCPh)₂(en)(PMe₂Ph)₂](3), shown by i.r., ¹H and ³¹P-{¹H} n.m.r. studies to contain trans S-bonded ^–SCOPh and cis-PMe₂Ph groups. Reaction of (1) with 2,2′-bipyridyl (bipy) or 1,10-phenanthroline (phen) also gives the six-co-ordinate [Ru(SOCPh)₂(N–N)(PMe₂Ph)₂] complexes but spectroscopic and X-ray analyses (for N–N = phen) reveal that the major product has the cis,cis,cis configuration (4). The crystals are monoclinic, space group P2₁/c, with a= 15.710(1), b= 13.729(2), c= 17.482(2)Å, and β= 90.79(1)°. A minor product shown by X-ray analysis to be cis,cis,trans-[Ru(SOCPh)₂(phen)(PMe₂Ph)₂](5) is also formed. The crystals are monoclinic, space group P2₁/c, with a= 16.896(4), b= 10.754(2), c=21.332(2)Å, and β= 94.92(1)°.