Crystal and molecular structure of tricarbonyliodotris(dimethylphenylphosphino) tungsten(II) tetraphenylborate

Abstract

Crystals of the title compound are triclinic, space group P1, Z= 1, with a= 12·216(9), b= 10·100(8), c= 10·287(11)Å, α= 100·55(9), β= 104·87(12), γ= 89·31(8)°. The structure was solved by heavy-atom methods from 3866 independent reflections, collected by counter methods and refined to R 0·052. The cation is a seven-co-ordinate monomer; the co-ordination sphere has a (1 : 2 : 2 : 2) C_s geometry which is intermediate between the capped trigonal prism and the capped octahedron though more similar to the former. The iodine atom occupies the unique position [W–I(1) 2·840(1)Å]. This ligand has four nearest neighbours, two carbonyl groups [W–C 1·994(18), 2·000(16)Å] and two phosphorus atoms [W–P 2·576(4), 2·614(5)Å]. The third carbonyl group [W–C 1·933(20)Å] and third phosphorus atom [W–P 2·528(5)Å] are in the remaining edge. The twisting of the phenyl rings in the anion is as expected.