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Separation of isotropic chemical and second-order quadrupolar shifts by multiple-quantum double rotation NMR by Ivan Hung; Alan Wong; Andy P. Howes; Tiit Anupõld; Ago Samoson; Mark E. Smith; Diane Holland; Steven P. Brown; Ray Dupree is a Chemistry article available to read on EtoBox.

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Using a two-dimensional multiple-quantum (MQ) double rotation (DOR) experiment the contributions of the chemical shift and quadrupolar interaction to isotropic resonance shifts can be completely separated. Spectra were acquired using a three-pulse triple-quantum z-filtered pulse sequence and subsequently sheared along both the nu(1) and nu(2) dimensions. The application of this method is demonstrated for both crystalline (RbNO(3)) and amorphous samples (vitreous B(2)O(3)). The existence of the two rubidium isotopes ((85)Rb and (87)Rb) allows comparison of results for two nuclei with different spins (I=3/2 and 5/2), as well as different dipole and quadrupole moments in a single chemical compound. Being only limited by homogeneous line broadening and sample crystallinity, linewidths of approximately 0.1 and 0.2 ppm can be measured for (87)Rb in the quadrupolar and chemical shift dimensions, enabling highly accurate determination of the isotropic chemical shift and the quadrupolar product, P(Q). For vitreous B(2)O(3), the use of MQDOR allows the chemical shift and electric field gradient distributions to be directly determined-information that is difficult to obtain otherwise due to t

Who reads Separation of isotropic chemical and second-order quadrupolar shifts by multiple-quantum double rotation NMR?

Author

Ivan Hung; Alan Wong; Andy P. Howes; Tiit Anupõld; Ago Samoson; Mark E. Smith; Diane Holland; Steven P. Brown; Ray Dupree

Publisher

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

Published

2009

Language

EN

Field

Chemistry (Physical Sciences)