Abstract
Some new pentacoordinated anionic spirobicyclic silicon(IV) compounds containing the isothiocyanato group, [(C6H4O2)2SiNCS]− M+; [M=K(1), Na(2), K(18-crown-6)(3), NH4(4)], have been prepared by the activation of the silicon centre of tetracoordinated silances by NCS− ion. These compounds have been characterised by elemental analyses, IR, multinuclei (1H,13C and29Si) NMR and FAB mass spectroscopy. Synthesis of stable spirobicyclic hexacoordinated dianionic siliconates with six-and seven-membered oxygen-containing rings around silicon atoms, [(C7H4O3)2 Si(NCS)2]2−2B+; (B=PyH(5), 3-mepyH(6)4-mePyH(7)] and [(C8H4O4)2Si(NCS)2]2−2[3-mepyH]+(8), are also described. The complexes5–8 have been achieved from the reactions of appropriate cationic five-coordinate silicon (IV) intermediate with salicylic acid (5–7) or phthalic acid (8). The resulting compounds have been characterised by elemental analyses. IR multinuclei (1H,13C,29Si) NMR spectral data.
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Part I:Narulaet al (1994)
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Narula, S.P., Shankar, R. & Meenu Recent chemistry of hypervalent silicon(IV) compounds — Part II. Synthesis and characterisation of some new spirobicyclic five- and six-coordinated siliconate anions. Proc. Indian Acad. Sci. (Chem. Sci.) 108, 123–129 (1996). https://doi.org/10.1007/BF02870018
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DOI: https://doi.org/10.1007/BF02870018