Relaxation of multiple-quantum coherences in dipolar coupled 1H spin pairs in gypsum

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Аннотация

The evolution and relaxation of MQ NMR coherences on the preparation period were investigated experimentally on a single crystal of gypsum, CaSO4·2H2O. The theory describing the dynamics of MQ coherences on the preparation period of MQ experiment for a pair of spins was developed based on the Lindblad master equation. This theory predicts the appearance of MQ coherences of only zeroth and second orders, oscillatory exchange of their intensities and exponential decay with increasing of the preparation time. The proposed theory describes the experimental data well. It is shown that the frequency of oscillations depends on the orientation of the crystal in the external magnetic field and determined by the dipolar coupling between protons of the water molecules contained in the gypsum crystal. The relaxation time of MQ coherences of zeroth and second orders, Tr= 150±15 μs, were independent of the crystal orientation, which suggest a common source of relaxation due to the dipole-dipole interactions with protons surrounding water molecule.

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Авторлар туралы

Е. Fel’dman

Federal Research Center of Problems of Chemical Physics and Medicinal Chemistry of Russian Academy of Sciences

Email: svasilev@icp.ac.ru
Ресей, Chernogolovka

E. Kuznetsova

Federal Research Center of Problems of Chemical Physics and Medicinal Chemistry of Russian Academy of Sciences

Email: svasilev@icp.ac.ru
Ресей, Chernogolovka

A. Fedorova

Federal Research Center of Problems of Chemical Physics and Medicinal Chemistry of Russian Academy of Sciences

Email: svasilev@icp.ac.ru
Ресей, Chernogolovka

K. Panicheva

Federal Research Center of Problems of Chemical Physics and Medicinal Chemistry of Russian Academy of Sciences; Lomonosov Moscow State University

Email: svasilev@icp.ac.ru
Ресей, Chernogolovka; Moscow

S. Vasil’ev

Federal Research Center of Problems of Chemical Physics and Medicinal Chemistry of Russian Academy of Sciences

Хат алмасуға жауапты Автор.
Email: svasilev@icp.ac.ru
Ресей, Chernogolovka

A. Zenchuk

Federal Research Center of Problems of Chemical Physics and Medicinal Chemistry of Russian Academy of Sciences

Email: svasilev@icp.ac.ru
Ресей, Chernogolovka

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2. Fig. 1. Splittings of doublets in 1H NMR spectra of gypsum during sample rotation. Data for two water molecules in the structure are shown by different colors and symbols. Positions investigated in MC experiments are marked by vertical lines.

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3. Fig. 2. 1H NMR spectra of gypsum obtained at different positions in an external magnetic field.

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4. Fig. 3. Intensities of MC coherences depending on the duration of the preparatory period of the external Pos3 doublet.

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5. Fig. 4. Intensities of zero-order MC coherences as a function of the dimensionless parameter Δvτ combined on a common scale for different crystal orientations.

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6. Fig. 5. Intensities of MC NMR 1H coherences in a gypsum crystal at different orientations corresponding to different splittings, Δv, in the 1H spectra: (a) 89.4 kHz (Pos1), (b) 33.8 kHz (Pos1), (c) 68.5 kHz (Pos2), (d) 63.2 kHz (Pos3), (e) 18 kHz (Pos3), (e) 77.1 kHz (Pos4), (g) 40.7 kHz (Pos4). Theoretical curves for the 0th and 2nd orders are shown as solid lines. The exponential envelope exp(–τ/Tr) is shown as a black solid line for the 0th order coherence.

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