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Solid State Nucl Magn Reson. 2019 Sep;101:76-81. doi: 10.1016/j.ssnmr.2019.05.006. Epub 2019 May 14.

Homonuclear dipolar recoupling of arbitrary pairs in multi-spin systems under magic angle spinning: A double-frequency-selective ZQ-SEASHORE experiment.

Author information

1
U.S. DOE Ames Laboratory, Iowa State University, Ames, IA, 50011-3020, United States. Electronic address: takeshi@iastate.edu.
2
U.S. DOE Ames Laboratory, Iowa State University, Ames, IA, 50011-3020, United States; Department of Chemistry, Iowa State University, Ames, IA, 50011-3020, United States.
3
U.S. DOE Ames Laboratory, Iowa State University, Ames, IA, 50011-3020, United States; Department of Chemistry, Iowa State University, Ames, IA, 50011-3020, United States. Electronic address: mpruski@iastate.edu.

Abstract

We describe a useful method for measuring the internuclear distances within arbitrarily selected pairs of like nuclei in dipolar-coupled multi-spin systems. The method uses a combination of the zero-quantum shift-evolution-assisted selective homonuclear recoupling (ZQ-SEASHORE) technique developed by Hu and Tycko [J. Chem. Phys. 2009, 131, 045101] and double-frequency-selective radio-frequency pulse. The double-frequency-selective pulse inverts polarizations of two spins simultaneously, and thus applications of the method presented here are only limited by the spectral resolution, and not by the number of interacting spins. Our experiments demonstrate the validity of the method and present analytical expressions for the dephasing curve.

KEYWORDS:

Double-frequency-selective pulse; Homonuclear recoupling; Internuclear distance; Multi-spin effect; Solid-state NMR

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