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Multinuclear magnetic resonance study of N,N′,N″-tris(trimethylsilyl)borazine

✍ Scribed by Bernd Wrackmeyer; Bernd Schwarze; D. Michael Durran; Graham A. Webb

Publisher
John Wiley and Sons
Year
1995
Tongue
English
Weight
326 KB
Volume
33
Category
Article
ISSN
0749-1581

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✦ Synopsis

Abstract

The nuclear spin relaxation rate of the quadrupolar ^14^N nuclei in N,N′,N″‐tris(trimethylsilyl)borazine (1) is surprisingly slow [T~1~(^14^N)=0.1 s]. This allows one to measure ^1^J(^29^Si^14^N) (9.6 Hz) directly from the ^29^Si NMR spectra and also to compare signs of coupling constants ^1^J(^29^Si^14^N) (<0) and ^3^J(^14^NSiC^1^H) (>0) by 2D ^29^Si/^1^H HETCOR experiments. Since the transverse relaxation time T~2~(^14^N) in 1 is governed by scalar relaxation of the second kind, the magnitude of ^1^J(^14^N^11^B) can be evaluated (23 ± 0.5 Hz). ^11^B, ^14^N and ^29^Si NMR data for N,N′‐bis(trimethylsilyl)borazine (2) were also obtained, and ^11^B and ^14^N NMR spectra of the parent borazine [HBNH]~3~ (3), and of [HBNMe]~3~ (4) were remeasured. Calculation of the tensor components of the ^14^N electric field gradient shows that eq~zz~ in 1 and in 2 for ^14^N(Si) is significantly smaller than for other borazines [HBNR]~3~, e.g. with R=H (3) or Me (4), in agreement with the experimental results.

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