Publication

Reactions of [Ru(H2O)(6)](2+) with water-soluble tertiary phosphines

Gabor Laurenczy
2004
Journal Articles

Abstract

In aqueous solutions under mild conditions, Ru(H2O)(6) 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)(5)L, cis-Ru(H2O)(4)L-2, and trans-Ru(H2O)(4)L-2 even in a high ligand excess. With the small aliphatic phosphine L = 1,3,5-triaza-7-phosphatricyclo-[3.3.1.1(3,7)]decane (pta) at [L] : [Ru] = 12 : 1, the tris- and tetrakisphosphino species, Ru(H2O)(3)(pta)(3), Ru(H2O)(2)(pta)(4), 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)(4).2H(2)O, trans-Ru(H2O)(4)(ptaH)(2)(4).2H(2)O, and trans-mer-[RuI2(H2O)-(ptaMe)(3)]I-3.2H(2)O, containing protonated or methylated pta ligands (ptaH and ptaMe, respectively) were determined by single crystal X-ray diffraction.

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https://infoscience.epfl.ch/entities/publication/10af2273-6842-4982-a1b5-68048448a4e8

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Gabor Laurenczy
2004
Journal Articles

Abstract

Official source

https://infoscience.epfl.ch/entities/publication/10af2273-6842-4982-a1b5-68048448a4e8

About this result

Related concepts (20)

Metal-phosphine complex

A metal-phosphine complex is a coordination complex containing one or more phosphine ligands. Almost always, the phosphine is an organophosphine of the type R3P (R = alkyl, aryl). Metal phosphine complexes are useful in homogeneous catalysis. Prominent examples of metal phosphine complexes include Wilkinson's catalyst (Rh(PPh3)3Cl), Grubbs' catalyst, and tetrakis(triphenylphosphine)palladium(0). Many metal phosphine complexes are prepared by reactions of metal halides with preformed phosphines.

X-ray crystallography

X-ray crystallography is the experimental science determining the atomic and molecular structure of a crystal, in which the crystalline structure causes a beam of incident X-rays to diffract into many specific directions. By measuring the angles and intensities of these diffracted beams, a crystallographer can produce a three-dimensional picture of the density of electrons within the crystal. From this electron density, the mean positions of the atoms in the crystal can be determined, as well as their chemical bonds, their crystallographic disorder, and various other information.

Ligand cone angle

In coordination chemistry, the ligand cone angle (θ) is a measure of the steric bulk of a ligand in a transition metal coordination complex. It is defined as the solid angle formed with the metal at the vertex of a cone and the outermost edge of the van der Waals spheres of the ligand atoms at the perimeter of the base of the cone. Tertiary phosphine ligands are commonly classified using this parameter, but the method can be applied to any ligand. The term cone angle was first introduced by Chadwick A.

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Reactions of [Ru(H2O)(6)](2+) with water-soluble tertiary phosphines

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