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Inverse detection of broad resonances: 15 N NMR spectra of boron–nitrogen compounds
Author(s) -
Wrackmeyer Bernd,
Kupče Ēriks,
Köster Roland,
Seidel Günter
Publication year - 1992
Publication title -
magnetic resonance in chemistry
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.483
H-Index - 72
eISSN - 1097-458X
pISSN - 0749-1581
DOI - 10.1002/mrc.1260300507
Subject(s) - chemistry , adduct , nitrogen , boron , borane , spectral line , proton , proton nmr , nuclear magnetic resonance spectroscopy , quinazolinone , crystallography , stereochemistry , organic chemistry , catalysis , physics , quantum mechanics , astronomy
Two types of proton‐detected 1 H 15 N correlation experiments were compared with respect to the observation of 15 N NMR resonances broadened by scalar relaxation of the second kind. Both single‐ and multiple‐quantum experiments gave equal 15 N line widths in F 1 , and in all cases the inverse experiments provided a dramatic increase in sensitivity and spectrometer time‐saving compared with the direct observation of 15 N resonances. Various aminoboranes [B(NHMe) 3 ; B(NHNMe 2 ) 3 ; 2,3‐dihydro‐2‐methyl‐2‐boraperimidine; organo‐substituted 2,5‐dihydro‐1,2,5‐azasilaboroles; organo‐substituted 7,8‐benzo‐1‐oxa‐6‐aza‐2‐sila‐5‐bora‐3‐cyclooctene], organo‐substituted 2,5‐dihydro‐1,2,5‐azasilaboratolates, an amine–borane adduct (organo‐substituted 7,8‐benzo‐6‐oxa‐1‐aza‐2‐sila‐5‐borabicyclo[3.3.0]oct‐3‐ene), and (ligand)transition metal π‐complexes of organo‐substituted 2,5‐dihydro‐1,2,5‐azasilaboroles were studied by two‐dimensional inverse 1 H{ 15 N} NMR experiments. The straightforward application to the analysis of several mixtures suggests that this technique is promising for the investigation of oligomerization and polymerization of boron—nitrogen compounds.