منابع مشابه
Ultrahigh-Resolution NMR Spectroscopy**
Spectral resolution is vital in NMR spectroscopy, but is instrument-limited. Recent “pure shift” pulse-sequence developments greatly improve resolution, but often at a high cost in sensitivity. We introduce a new class of pure shift experiments (PSYCHE) with superior sensitivity, spectral purity, and tolerance of strong coupling. The key parameters for any spectroscopic technique are sensitivit...
متن کاملSome Applications of Ultrahigh Resolution 15N NMR Spectroscopy
Ultrahigh resolution l5N NMR spectra were measured for two nitroalkanes (MeNÜ2 la, fBuN02 lc), two isocyanates (;BuNCO 2c, Me^SiNCO 2d), four isothiocyanates (MeNCS 3a, EtNCS 3b, 'BuNCS 3c, M e3SiNCS 3d), one carbodiimide (Me3 SiNCNSiMe3 4d), one keteneimine [Me3 SiNCC(SiMe3 ) 2 5d], two sulphinyl imides ('BuNSO 6c, Me3 SiNSO 6d), and N-terf-butyl-pyrrole 7c, in order to determine coupling cons...
متن کاملUltrahigh resolution protein structures using NMR chemical shift tensors.
NMR chemical shift tensors (CSTs) in proteins, as well as their orientations, represent an important new restraint class for protein structure refinement and determination. Here, we present the first determination of both CST magnitudes and orientations for (13)Cα and (15)N (peptide backbone) groups in a protein, the β1 IgG binding domain of protein G from Streptococcus spp., GB1. Site-specific...
متن کاملUltrahigh resolution mass spectrometry
The integration of soft ionization technologies and ultrahigh resolution FTICR mass spectrometry (Fourier transform ion-cyclotron MS) has enabled the examination of molecules, directly from mixtures, with ultrahigh mass resolution and sub-ppm mass accuracy. This ability to observe structure and reactivity aspects of intact (macro)molecules has, in particular, contributed to the molecular-level ...
متن کاملHigh-resolution heteronuclear correlation NMR spectroscopy; applications to heterogeneous catalysis
We describe the catalytic applications of new solid-state NMR experiments, which provide high-resolution two-dimensional heteronuclear correlation (HETCOR) spectra using through-space and through-bond interactions between nuclear spins. These methods are applied to several microporous framework aluminophosphates and to a new type of ZSM-5-based petrochemical catalysts. Solid-state nuclear magne...
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ژورنال
عنوان ژورنال: Angewandte Chemie International Edition
سال: 2014
ISSN: 1433-7851
DOI: 10.1002/anie.201404111