13C, 15N and 29Si NMR spectra of triazasilatranes

• Published in: Journal of organometallic chemistry Vol. 333; no. 1; pp. 1 - 7
• Main Authors: Kupče, Ē., Liepiņš, E., Lapsiņa, A., Zelčās, G., Lukevics, E.
• Format: Journal Article
• Language: English
• Published: Lausanne Elsevier B.V 01.10.1987; Elsevier Science
• Subjects: Atomic and molecular physics; Exact sciences and technology; Molecular properties and interactions with photons; Nuclear resonance and relaxation; Physics; Chemical solution; NMR parameter; Bicyclic compound; Atrane; Nitrogen silicon heterocycle; Experimental study; NMR spectrum; Organic compounds
• ISSN: 0022-328X; 1872-8561
• DOI: 10.1016/S0022-328X(00)99025-9

13C, 15N and 29Si chemical shifts and 29Si 1H, 29Si 13C and 29Si 15N coupling constants as well as SiH 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 2CH (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 SiX bonds in I (X = NH) in comparison with II (X = O).