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Hexacoordinate dianionic silicates [(C4H2C>4)2Si(NCS)2r [BH + ]2 (where Β = py (1), 3-mepy (2), 4-mepy (3)) bearing two seven membered rings around silicon atom are obtained from the reactions between appropriate cationic five coordinate silicon (IV) compounds  and maleic acid. All the compounds are characterized by elemental analyses, molar conductance data as well as IR and Ή, 13 C NMR spectroscopy. FAB mass spectra (NBA matrix) of 1-2 have identified respective cations and anions of thesedoi:10.1515/mgmc.2002.25.11.655 fatcat:crvzrlmrpzdkjjqwdhpvope3ke