Abstract
Abstract Some spirobicyclic anionic siliconates with isothiocyanate group linked to silicon atom, i.e. [(C6H4O2)2 Si NCS]−M+ [M = K (1), Na (2), K(18-crown-6) (3), NH4 (4)] are prepared from the reactions of triethoxyisothiocyanato silane and benzene-1,2-diol in presence of the corresponding alkali metal/ammonium thiocyanates. The reaction of 1–4 with diethylamine results in the formation of intermolecular coordination complexes containing hexacoordinate siliconate anion, [(C6H4O2),SiNCS.Et2NH]−M+ [M = K (5), Na (6), K(18-crown-6) (7), Et2NH2 (8)]. The reactions of 1–3 with dimethylsulfite afford new pentaoxy siliconate derivatives, [(C6H4O2)2SiOMe]−M+(solv).[M(solv) = K(Me2SO3) (9), Na(Me2SO3) (10), K(18-crown-6) (11)]. All the compounds isolated here are characterized by elemental analyses, IR, multinuclei (1H, 13C and 29Si) NMR and FAB-mass spectroscopy.
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