Proton-detected 14N MAS NMR using homonuclear decoupled rotary resonance
Proton-detected 14N MAS NMR using homonuclear decoupled rotary resonance
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DOI：
10.1016/j.cplett.2006.12.066
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发表时间：
2007-02-12
影响因子：
2.8
通讯作者：
Trebosc, Julien
中科院分区：
文献类型：
--
作者：
Gan, Zhehong;Amoureux, Jean Paul;Trebosc, Julien
描述了一种增强灵敏度的H-1/N-14 MAS HMQC实验，用于质子检测固体的N-14核磁共振。灵敏度的提高是通过使用偶极重耦合来实现相干转移，即所谓的n = 2旋转共振。当连续波射频场与样品旋转频率n = ω (1)/ ω (r)匹配一定比例时，会发生旋转共振。以不可约的形式给出了化学位移各向异性、异核和同核偶极相互作用的旋转共振理论。结果表明，对于质子探测的n- 14核磁共振，n = 2旋转共振解耦了同核偶极相互作用，而重新耦合了异核偶极相互作用。进行了n = 2旋转共振2下的偶极重耦合、T′(2)延长和H-1/ n -14 HMQC实验。(c) 2006 Elsevier B.V.版权所有
A robust sensitivity-enhanced H-1/N-14 MAS HMQC experiment is described for proton-detected N-14 NMR of solids. The sensitivity enhancement is achieved by using dipolar recoupling for coherence transfer with a so-called n = 2 rotary resonance. Rotary resonance occurs when a cw rf field matches certain ratios with the sample spinning frequency, n = omega(1)/omega(r). The theory of rotary resonance for chemical shift anisotropy, heteronuclear and homonuclear dipolar interactions is presented in the irreducible representation. It is shown that the n = 2 rotary resonance decouples the homonuclear dipolar interactions while recoupling the heteronuclear dipolar interaction for proton-detected N-14 NMR. The dipolar recoupling, T'(2) lengthening, and H-1/N-14 HMQC experiment under the n = 2 rotary resonance 2 are demonstrated. (c) 2006 Elsevier B.V. All rights reserved.