Regular ArticleA Comparison between REDOR and θ-REDOR for Measuring 13C–2D Dipolar Interactions in Solids
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Cited by (19)
An optimal double-magic flip angle for performing the distance measurement REDOR experiment on a spin S=1
2015, Solid State Nuclear Magnetic ResonanceCitation Excerpt :In this paper, we show that when the quadrupolar coupling constant is sufficiently small, the ideal flip angle on the S=1 spin should be 109.47° and not 90° and that it leads to a more efficient dephasing of the signal, ideally reaching 1/9, which corresponds to a REDOR recoupling curve rising up to 89% (8/9). From Eqs. (1.8) and (1.9) and as reported before [12,18] we can see that the values of the normalized signals do not achieve complete recoupling (ΔS/S0=1); when using a π/2 pulse, the signal reaches a maximal value of 5/6 and when using a π pulse recoupling can reach a maximum of only 2/3; however, the initial rise is faster (see also simulations in Fig. 2). Clearly the signal will rise faster than in the case of a π/2 pulse and although slower than the π pulse, it will reach a much higher maxima (8/9 or 89%) corresponding to the best possible recoupling under the condition of small CQ.
Constant time REDOR NMR spectroscopy
2012, Annual Reports on NMR SpectroscopyCitation Excerpt :Principally, the evolution curves for multiple-spin systems can be calculated by a numerical evaluation of the Liouville–von Neumann equation; however, since the dimension of the spin matrix for an S–In spin system is given by (2S + 1) × (2I + 1)n, the computation times with increasing n become quite large, especially with quadrupolar I nuclei involved. Thus, although in favourable cases a selective excitation of a single I nucleus in an S–In spin system has been successfully demonstrated (θ-REDOR,74,75 frequency-selective REDOR76), the case of multiple-spin interactions still poses some serious challenges. Numerous variations of the original REDOR pulse sequence have been established to adapt the technique to specific needs.
Vanadium-51 NMR
2007, Annual Reports on NMR SpectroscopyCitation Excerpt :These types of vanadium species are similar to those observed in the V2O5 xerogels. Crans, Levinger and coworkers utilized 51V solution NMR spectroscopy to probe interactions of dipicolinatodioxovanadium(V) complexes in reverse micelles.201,202 Based on the analysis of the 51V longitudinal and transverse relaxation rates and 1H-1H NOEs, the authors conclude that the oxovanadium complex is buried in the hydrophobic part of the interfacial region of the Aerosol OT microemulsions,203 while in the water/cetyltrimethylammonium bromide (CTAB)/n-pentanol/cyclohexane quarternary microemulsions, the complex is located near the lipid interface, with the hydrophobic portion of the dipicolinato ligand facing the aqueous micellar interior.
Measuring heteronuclear dipolar couplings for I=1/2, S > 1/2 spin pairs by REDOR and REAPDOR NMR
2005, Progress in Nuclear Magnetic Resonance SpectroscopyInternuclear distance determination of S = 1, I = 1/2 spin pairs using REAPDOR NMR
2002, Journal of Magnetic ResonanceMeasuring <sup>13</sup> C- <sup>2</sup> D Dipolar Couplings with a Universal REDOR Dephasing Curve
2000, Journal of Magnetic Resonance