Abstract
Tris(trimethylstannyl)amine 1 and trimethylsilyl-bis(trimethylstannyl)amine 2 (both ca. 13% 15N labelled) were studied by 115/117/119Sn-, 15N-, and 29Si NMR spectroscopy. Precise measurements of the Sn NMR frequencies of the respective Sn/ 15N isotopomers did not reveal any appreciable primary isotope effect, in agreement with the previous results. The standard frequencies Ξ( 119Sn) and Ξ( 117Sn), determined for tetramethyltin more than 30 years ago, were found to be very accurate, and Ξ( 115 Sn)=32.718781 MHz was measured in this work. In the 15N NMR spectra, small secondary isotope effects 1 Δ 117/119Sn( 15N) and 1 Δ 115/119Sn( 15N) could be detected for the first time, the 15N nucleus in the heavier isotopomer being more shielded. In the 29Si NMR spectrum of 2, the expected isotope-induced chemical shift 1 Δ 14/15N( 29Si) is shown, and in addition the so far unknown effect over two bonds 2 Δ 117/119Sn( 29Si) is visible.
Published Version
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