Nuclear Overhauser Effect (NOE) Enhancement of 11B NMR Spectra of Borane Adducts in the Solid State

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• 作者：Sharon E. Ashbrook ; Nicholas G. Dowell ; Ivan Prokes ; and Stephen Wimperis
• 刊名：Journal of the American Chemical Society
• 出版年：2006
• 出版时间：May 31, 2006
• 年：2006
• 卷：128
• 期：21
• 页码：6782 - 6783
• 全文大小：42K
• 年卷期：v.128,no.21(May 31, 2006)
• ISSN：1520-5126

文摘

A strong ¹¹B {¹H} nuclear Overhauser effect (NOE) enhancement can be observed in solid-state ¹¹B NMR spectra of borane adducts, yielding fractional enhancements, f_I{S} = (I - I⁰)/I⁰, of the magic angle spinning (MAS) NMR signal of up to 155%. This is an interesting and unusual observation as ¹¹B (spin I = 3/2) is a quadrupolar nucleus and the corresponding NOE is completely absent in solution. More generally, it shows that the NOE may have a wider role to play in solid-state NMR studies of dynamics than has been envisaged hitherto.