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Reaction of SiCl 4  with NMe 4 NCSe or NEt 4 NCSe in cold acetonitrile leads to the corresponding crystalline salts of the new hexa-coordinate silicon complex anion [Si(NCSe) 6 ] 2-  (1 ] ; . Their crystallographic data were determined: [NMe 4 ] 2 [Si(NCSe) 6 ]: rhombohedral. R3̄. a = 897 pm. a = 84.1°. Z = 1. [NEt 4 ] 2 [Si(NCSe) 6 ], tetragonal modification (from pure acetonitrile): P4 2 /m, a = 1056 pm. c - 1580 pm. Z = 2. [NEt 4 ] 2 [Si(NCSe) 6 ]. orthorhombic modification (from acetonitrile containing NEt 4 Cl): a = 1704 pm. b = 1986 pm. c = 1028 pm. Z = 4. N-bonding of the NCSe groups in [Si(NCSe) 6 ] 2  is proved by the X-ray structure analysis of [NMe 4 ] 2 [Si(NCSe) 6 ] and by IR spectra. The concentration dependence of the molar conductance of an acetonitrile solution of [NMe 4 ] 2 [Si(NCSe) 6 ] was studied. At low concentrations partial dissociation of the hexa-isoselenocyanatosilicate ion is observed.

Ein weiteres Silicat-Anion: [Si(NCSe) 6 ] 2– / A Further Silicate Anion: [Si(NCSe) 6 ] 2–