title: A new hexakis(isocyanato)silicate(IV) and the first neutral Lewis-base adducts of silicon tetraisocyanate.
abstract: The new silicates K2Si(NCE)6, E = O, S (1a,b) were synthesised directly by reaction of silicon tetrachloride with potassium cyanate or thiocyanate. 1a,b can be converted to the salts (PPN)2[Si(NCE)6] (2a,b) with bulky cations (PPN+ = N(PPh3)2+), which contain isolated silicate dianions. Reaction of 1a with diimines affords the hexacoordinate complexes Si(NCO)4L, L = bpy (3), phen (4), which are the first isolated neutral adducts to Si(NCO)4. The compounds were characterised by a combination of IR and NMR spectroscopies, MS, TGA, DSC and X-ray diffraction.
authors.affiliation: Department of Chemistry, The University of Sheffield, Brook Hill, UK S3 7HF. p.portius@sheffield.ac.uk
authors.forename: Peter
authors.initials: P
authors.lastname: Portius
authors.forename: Martin
authors.initials: M
authors.lastname: Davis