Anisotropic relaxation of nuclear spins dipolar energy of water molecules in two-dimensional nanopores - A single crystal NMR study

IF 1.8 3区 化学 Q4 CHEMISTRY, PHYSICAL Solid state nuclear magnetic resonance Pub Date : 2024-06-19 DOI:10.1016/j.ssnmr.2024.101944
Alexander M. Panich , Jan Swenson
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Abstract

Energy transfer from Zeeman to dipolar order discovered by Jeener et al. is usually observed in solids with a strong dipole-dipole interaction of nuclear spins. It is not observed in liquids, where fast molecular motion completely averages this interaction. The intermediate case, when the dipole-dipole interaction of nuclear spins is only partially averaged, has been poorly studied. We report on the first measurement of an angular-dependent proton spin relaxation of a dipolar reservoir in mobile water molecules confined in the interlayer pores of a vermiculite single crystal. In this layered crystal, the intramolecular dipole-dipole interactions of nuclear spins are only partially averaged due to the restricted anisotropic molecular motion in nanopores. We show that this allows the formation of dipolar echo. We measured the spin-lattice relaxation times of the dipolar order T1D at different angles between the normal to the crystal surface and the applied magnetic field and obtained a distinct angular dependence of T1D. The minimum relaxation rate R1D was found around the magic angle of 54.74°.

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二维纳米孔隙中水分子核自旋偶极能的各向异性弛豫--单晶体核磁共振研究
Jeener 等人发现的从泽曼阶到偶极阶的能量转移通常是在核自旋具有强烈偶极-偶极相互作用的固体中观察到的。在液体中则观察不到这种现象,因为在液体中,快速分子运动会将这种相互作用完全平均化。对于核自旋偶极-偶极相互作用仅被部分平均化的中间情况,研究较少。我们首次测量了封闭在蛭石单晶体层间孔隙中的移动水分子的双极储层中质子自旋弛豫的角度依赖性。在这种层状晶体中,由于各向异性的分子运动在纳米孔隙中受到限制,核自旋的分子内偶极-偶极相互作用仅部分平均化。我们的研究表明,这使得偶极回波得以形成。我们测量了晶体表面法线与外加磁场之间不同角度下双极阶 T1D 的自旋-晶格弛豫时间,并获得了 T1D 的明显角度依赖性。在 54.74° 的神奇角度附近发现了最小弛豫速率 R1D。
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来源期刊
CiteScore
5.30
自引率
9.40%
发文量
42
审稿时长
72 days
期刊介绍: The journal Solid State Nuclear Magnetic Resonance publishes original manuscripts of high scientific quality dealing with all experimental and theoretical aspects of solid state NMR. This includes advances in instrumentation, development of new experimental techniques and methodology, new theoretical insights, new data processing and simulation methods, and original applications of established or novel methods to scientific problems.
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