MULTINUCLEAR MAGNETIC-RESONANCE STUDY OF N,N',N''-TRIS(TRIMETHYLSILYL)BORAZINE

被引：15

作者：

WRACKMEYER, B ^{[1
]}

SCHWARZE, B ^{[1
]}

DURRAN, DM ^{[1
]}

WEBB, GA ^{[1
]}

机构：

[1] UNIV SURREY,DEPT CHEM,GUILDFORD GU2 5XH,SURREY,ENGLAND

来源：

MAGNETIC RESONANCE IN CHEMISTRY | 1995年 / 33卷 / 07期

关键词：

NMR; N-14; B-11; BORAZINES; COUPLING CONSTANTS (1)J((SIN)-SI-29-N-14); (1)J((NB)-N-14-B-11); COUPLING SIGNS; N-14 ELECTRIC FIELD GRADIENT;

D O I：

10.1002/mrc.1260330711

中图分类号：

O6 [化学];

学科分类号：

0703 ;

摘要：

The nuclear spin relaxation rate of the quadrupolar N-14 nuclei in N,N',N''-tris(trimethylsilyl)borazine (1) is surprisingly slow [T-1(N-14) = 0.1 s]. This allows one to measure (1)J((SiN)-Si-29-N-14) (9.6 Hz) directly from the Si-29 NMR spectra and also to compare signs of coupling constants (1)J((SiN)-Si-29-N-14) (<0) and (3)J((NSiCH)-N-14-H-1) (>0) by 2D Si-29/H-1 HETCOR experiments. Since the transverse relaxation time T-2(N-14) in 1 is governed by scaler relaxation of the second kind, the magnitude of (1)J((NB)-N-14-B-11) can be evaluated (23 +/- 0.5 Hz). B-11, N-14 and Si-29 NMR data for N,N'-bis(trimethylsilyl)borazine (2) were also obtained, and B-11 and N-14 NMR spectra of the parent borazine [HBNH](3) (3), and of [HBNMe](3) (4) were remeasured. Calculation of the tenser components of the N-14 electric field gradient shows that eq(zz) in 1 and in 2 for N-14(SS) is significantly smaller than for other borazines [HBNR](3), ag. with R = H (3) or Me (4), in agreement with the experimental results.

引用

页码：557 / 560

页数：4

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