Indirect nuclear spin-spin coupling in tetrachlorotetraborane(4) and halogenated polyhedral phospha- and arsaboranes

被引：0

作者：

Keller, W

Haubold, W

Wrackmeyer, B

机构：

[1] Univ Bayreuth, Lehrstuhl Anorgan Chem 2, Anorgan Chem Lab, D-95440 Bayreuth, Germany

[2] Univ Hohenheim, Inst Chem, D-70599 Stuttgart, Germany

来源：

MAGNETIC RESONANCE IN CHEMISTRY | 1999年 / 37卷 / 08期

关键词：

NMR; B-10; B-11; P-31; B-11{B-11} decoupling; chemical shifts; coupling constants; sign determination; closo-diheteropolyboranes;

D O I：

10.1002/(SICI)1097-458X(199908)37:8<545::AID-MRC496>3.0.CO;2-E

中图分类号：

O6 [化学];

学科分类号：

0703 ;

摘要：

The linewidths of B-10 NMR signals of tetrachlorotetraborane (1), measured at various temperatures, indicate that there are weak scalar B-11-B-10 interactions. Selective homonuclear B-11{B-11} decoupling experiments confirmed previous signal assignments and improved the resolution of B-11 NMR spectra (by simplifying the complex spin systems) of closo-diheteroboranes 1,2-P2B4Cl4 (2), 1,2-P2B4Br4 (3) and 1,2-AsPB4Cl4 (4) and the icosahedral closo-diheteroboranes 1,7-P2B10Cl10 (6) and 1,7-P2B10Br10 (7). This allowed the determination of coupling constants (1)J(P-31, B-11) of the order of 27-39 Hz, significantly smaller than for known non-halogenated parent compounds. The B-11 and P-31 NMR spectra of 2, measured at 60 degrees C, allowed the determination of (1)J(P-31, B-31) = -100 +/- 3 Hz by simulation. Copyright (C) 1999 John Wiley & Sons, Ltd.

引用

页码：545 / 550

页数：6

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