Asymmetric C13–C13 polarization transfer under dipolar-assisted rotational resonance in magic-angle spinning NMR
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چکیده
منابع مشابه
Recoupling of heteronuclear dipolar interactions with rotational-echo double-resonance at high magic-angle spinning frequencies.
Heteronuclear dipolar recoupling with rotational-echo double-resonance (REDOR) is investigated in the rapid magic-angle spinning regime, where radiofrequency irradiation occupies a significant fraction of the rotor period (10-60%). We demonstrate, in two model (13)C-(15)N spin systems, [1-(13)C, (15)N] and [2-(13)C, (15)N]glycine, that REDOR DeltaS/S(0) curves acquired at high MAS rates and rel...
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High static magnetic fields and very fast magic-angle spinning (MAS) promise to improve resolution and sensitivity of solid-state NMR experiments. The fast MAS regime has permitted the development of low-power cross-polarization schemes, such as second-order cross-polarization (SOCP), which prevent heat deposition in the sample. Those schemes are however limited in bandwidth, as weak radio-freq...
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Article history: Received 16 January 2008 In final form 15 May 2008 Available online 21 May 2008 0009-2614/$ see front matter 2008 Elsevier B.V. A doi:10.1016/j.cplett.2008.05.045 * Corresponding author. Fax: +972 8 9344123. E-mail address: [email protected] (L Few analytical techniques rival the capabilities of two-dimensional nuclear magnetic resonance. A scheme enabling 2D NMR acq...
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The N· · ·H distance within the unusual hydrogen-bonding arrangement adopted by a pair of methylsubstituted benzoxazine dimers (C6H3(OH)2CH2)2N(CH3) has been determined by solid-state NMR to be 194 ± 5 pm. This indicates that the proton is shared between the nitrogen and oxygen atoms, with a preference for an O–H rather than an N–H bond character. It is to be noted that a previous X-ray single ...
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ژورنال
عنوان ژورنال: The Journal of Chemical Physics
سال: 2006
ISSN: 0021-9606,1089-7690
DOI: 10.1063/1.2364503