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Internuclear Distance Determination of S=1, I=1/2 Spin Pairs Using REAPDOR NMR by Eric Hughes; Terry Gullion; Amir Goldbourt; Shimon Vega; Alexander J. Vega is a Chemistry article available to read on EtoBox.

What is Internuclear Distance Determination of S=1, I=1/2 Spin Pairs Using REAPDOR NMR about?

A universal function is proposed to describe REAPDOR dephasing curves of an observed spin-1/2 nucleus dipole-recoupled to a spin-1 quadrupolar nucleus ((2)H or (14)N). Previous work had shown that, in contrast to REDOR, the shape of the dephasing curve depends on a large number of parameters including the quadrupolar coupling constant and asymmetry parameter, the sample rotation speed, the RF amplitude, and the relative orientations of the quadrupole tensor and the internuclear vector. Here we demonstrate by numerical simulations that the actual dispersion of REAPDOR dephasing curves is quite small, provided the rotation speed and the RF amplitude applied to the quadrupolar nucleus satisfy an adiabaticity condition. The condition is easily met for (2)H and is also practically achievable for virtually any (14)N-containing compound. This allows the REAPDOR curves to be approximated by a simple universal gaussian-type function, comparison of which with experimental data yields internuclear distances with less than 4% error. The spin dynamics of the recoupling mechanism is discussed. The critical importance of a stable spinning speed for optimizing the signal-to-noise ratio of the (13)

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Author

Eric Hughes; Terry Gullion; Amir Goldbourt; Shimon Vega; Alexander J. Vega

Publisher

Elsevier Science; Elsevier ; Elsevier Inc.; Elsevier BV (ISSN 1090-7807)

Published

2002

Language

EN

Field

Chemistry (Physical Sciences)