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• W1970235311 endingPage "546" @default.
• W1970235311 startingPage "527" @default.
• W1970235311 abstract "14N solid-state NMR powder patterns have been obtained at high field (21.1 T) using broadband, frequency-swept pulses and a piecewise acquisition method. This approach allowed the electric field gradient (EFG) tensor parameters to be obtained from model organic and inorganic systems featuring spherically asymmetric nitrogen environments (CQ values of up to ca. 4 MHz). The advantages and limitations of this experimental approach are discussed, and the observation of 14N T2 relaxation anisotropy in certain systems is also reported, which can shed light on dynamic processes, allowing motional geometries and jump rates to be probed. In particular, we show that observable effects of dynamics on 14N spectra can be mediated by modulation of either the EFG tensor or heteronuclear dipolar couplings. It is demonstrated that the QCPMG protocol can be used to selectively enhance certain types of nitrogen environments on the basis of differences in T2. We also present the results of extensive density functional theory calculations on these systems, which show remarkably good correlation with the experimental results and allow the prediction of tensor orientations, assignment of parameters to crystallographic sites, and a rationalization of the origin of the EFG tensors in terms of contributions from individual molecular orbitals. This work demonstrates that ultra-wideline 14N solid-state NMR can, under favorable circumstances, be a straightforward, useful, and informative probe of molecular structure and dynamics." @default.
• W1970235311 created "2016-06-24" @default.
• W1970235311 creator A5007821807 @default.
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• W1970235311 creator A5041828405 @default.
• W1970235311 creator A5057007265 @default.
• W1970235311 creator A5077441233 @default.
• W1970235311 date "2010-12-23" @default.
• W1970235311 modified "2023-10-07" @default.
• W1970235311 title "Interaction Tensors and Local Dynamics in Common Structural Motifs of Nitrogen: A Solid-State ¹⁴N NMR and DFT Study" @default.
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