Influence of ion pairing on styrene hydrogenation using a cationic η6-arene β-diketiminato-ruthenium complex
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Five different types of expt. are described which make it possible to measure various relaxation rates of selected protons in crowded spectra of macromols. such as proteins: longitudinal spin-lattice relaxation rates rt = 1/T1, transverse relaxation rates ...
If the 90 Deg selective pulses that are normally used for vol. localization are replaced with self-refocusing 270 Deg pulses having a Gaussian time-domain amplitude profile, various pulse sequences can be made shorter, thus reducing the effects of transver ...
In NMR pulse experiments transverse magnetization is excited by irradiating the nuclear spin system with a two pulse sequence of a first RF chirp pulse and a second RF chirp pulse, generated after a defocusing time interval tau . The pulse duration of the ...
In order to assess the influence of longitudinal relaxation on previously reported variations in 31P NMR signals during brain development, we used an accelerated two-point technique to determine T1 at 2.35 Tesla in 8 min. Comparison between 10 normal neona ...
In crowded NMR spectra, it is shown how longitudinal relaxation rates (lab.-frame rates 1/T1) can be measured by selective inversion-recovery of a chosen site A followed by selective transfer of magnetization to another site X through a scalar coupling JAX ...
This method measures cross relaxation rates in highly resolving NMR spectroscopy, where the sample substance is dissolved in a liq. and has nuclei A and X which have different chem. shifts WA and WX in a homogeneous static magnetic field Bo in the directio ...
In order to achieve selective inversion of a chosen family of sidebands in NMR spectra of solids rotating at the magic angle (MAS spectra), a sequence of so-called DANTE pulses can be applied in synchronization with the sample rotation period. It is shown ...
New NMR techniques are described for transferring transverse magnetization between scalar-coupled nuclei in the rotating frame. The methods involve simultaneous spin-locking of two selected spins A and X, using cosinusoidal modulation of the radio frequenc ...
Two-dimensional nuclear Overhauser enhancement (NOESY) spectra of labile protons were recorded in H2O solutions of a protein and of a DNA duplex, using a modification of the standard NOESY experiment with all three 90 degree pulses replaced by jump-and-ret ...
The peak intensities within the multiplets in a 2-dimensional NOESY expt. with small flip angles reflect the transition probabilities due to dipolar and other relaxation mechanisms. In the initial rate approxn., the relaxation rates (elements of the W matr ...
