¹³C/¹⁴N heteronuclear multiple-quantum correlation with rotary resonance and REDOR dipolar recoupling

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• 关键词：¹³C/¹⁴N Correlation ; HMQC ; Dipolar recoupling ; MAS ; Rotary resonance ; REDOR
• 刊名：Journal of Magnetic Resonance
• 出版年：2007
• 期刊代码：126_10907807
• 类别：ch
• 出版时间：January 2007
• 卷：184
• 期：1
• 页码：39-43
• 文件大小：510 K

摘要

A two-dimensional ¹³C/¹⁴N heteronuclear multiple quantum correlation (HMQC) experiment using dipolar recoupling under magic-angle spinning (MAS) is described. The experiment is an extension of the recent indirect ¹³C detection scheme for measuring ¹⁴N quadrupolar coupling under MAS. The recoupling allows the direct use of the much larger dipolar interaction instead of the small J and residual dipolar couplings for establishing ¹³C/¹⁴N correlations. Two recoupling methods are incorporated into the HMQC sequence, both applying rf only to the observed ¹³C spin. The first one uses the REDOR sequence with two π-pulses per rotor cycle. The second one uses a cw rf field matching the spinning frequency, known as rotary resonance. The effects of CSA, signal loss, MAS frequency and stability and t₁-noise are compared and discussed.