Abstract
13C, 15N and 29Si chemical shifts and 29Si 1H, 29Si 13C and 29Si 15N coupling constants as well as SiH bond stretching frequencies in the triazasilatranes (I) (2,5,8,9-tetraaza-1-silatricyclo[3.3.3.0 1,5] undecanes) and model compounds, tris(alkylamino)silanes with R Si = H, Me, CH 2CH (Vi) and C 6H 5 (Ph) were measured. A stronger intramolecular N → Si bonding was revealed in I compared with their oxygen analogues, silatranes (II). This was assumed to be caused by the higher polarity of the equatorial SiX bonds in I (X = NH) in comparison with II (X = O).
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