In aqueous solutions under mild conditions, [Ru(H2O)6]2+was reacted with various water-soluble tertiary phosphines. As determined by multinuclear NMR spectroscopy, reactions with the sulfonated arylphosphines L = mtppms, ptppms and mtppts yielded only the mono- and bisphosphine complexes, [Ru(H2O)5L]2+, cis-[Ru(H2O)4L2]2+, and trans-[Ru(H2O)4L2]2+even in a high ligand excess. With the small aliphatic phosphine L = 1,3,5-triaza-7-phosphatricyclo-[220.127.116.11,7]decane (pta) at [L]:[Ru] = 12:1, the tris- and tetrakisphosphino species, [Ru(H2O)3(pta)3]2+, [Ru(H2O)2(pta)4]2+, [Ru(H2O)(OH)(pta)4]+, and [Ru(OH)2(pta)4] were also detected, albeit in minor quantities. These results have significance for the in situ preparation of Ru(ii)-tertiary phosphine catalysts. The structures of the complexes trans-[Ru(H2O)4(ptaMe)2](tos)4·2H2O, trans-[Ru(H2O)4(ptaH)2](tos)4·2H2O, and trans-mer-[RuI2(H2O)(ptaMe)3]I3·2H2O, containing protonated or methylated pta ligands (ptaH and ptaMe, respectively) were determined by single crystal X-ray diffraction.
|Number of pages||5|
|Journal||Journal of the Chemical Society. Dalton Transactions|
|Publication status||Published - Jul 26 2004|
- Coordination chemistry
- Nmr spectroscopy
- X-ray diffraction, X-ray powder diffraction
ASJC Scopus subject areas