Carbonyltrichlorotris(dimethylphenylphosphine)technetium-ethanol (1/1), the first seven-co-ordinate complex of technetium; position of this molecule in the C 3v family
- 1 January 1978
- journal article
- research article
- Published by Royal Society of Chemistry (RSC) in J. Chem. Soc., Dalton Trans.
- No. 5,p. 373-380
- https://doi.org/10.1039/dt9780000373
Abstract
The preparation and the crystal and molecular structure of the title complex are reported. The co-ordination polyhedron is that of a distorted capped octahedron (C3v symmetry). The technetium atom is seven-co-ordinate and bonded to three phosphine ligands (capped face), three chlorine ligands (uncapped face), and to the carbonyl group, which occupies the unique capping position. Crystals are monoclinic, space group P21/c, with cell dimensions a= 11.732(9), b= 11.807(9), c= 23.588(12)Å, and β= 103.42(8)° The structure has been refined by least squares to a conventional R of 0.093 for 1 794 observed reflections, Metal-ligand bond lengths are: Tc-CO 1.86(2), Tc-Cl 2.48(1), and Tc-P 2.44(1)Å. Seven-co-ordinate complexes are briefly reviewed; in particular, a description of C3v symmetry and its distortions has been developed in terms of repulsion theory and the angular-overlap model.Keywords
This publication has 0 references indexed in Scilit: