Journal ArticleDOI
Flip-back, an old trick to face highly contrasted relaxation times: Application in the characterization of pharmaceutical mixtures by CPMAS NMR
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TLDR
The application of the flip-back increases significantly the relative signal intensity of the component with the longer T(1), making this component detectable even after using short recycle delays, and could be used routinely to get (13)C CPMAS NMR spectra of mixtures in constant experimental time and signal-to-noise ratio.About:
This article is published in Solid State Nuclear Magnetic Resonance.The article was published on 2011-09-01. It has received 17 citations till now.read more
Citations
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Formation and characterization of melam, melam hydrate, and a melam-melem adduct.
TL;DR: Whereas the thermal treatment of dicyandiamide at 450 °C and 0.2 MPa ammonia yielded melam in large amounts, prolonged treatment under these conditions led to the formation of a melam-melem adduct, thus enabling the first insight into the condensation process of melam into melem.
Journal ArticleDOI
Caffeine Confinement into a Series of Functionalized Porous Zirconium MOFs: A Joint Experimental/Modeling Exploration
Sabine Devautour-Vinot,Charlotte Martineau,Sekou Diaby,Mouna Ben-Yahia,Stuart R. Miller,Christian Serre,Patricia Horcajada,Denise Cunha,Francis Taulelle,Guillaume Maurin +9 more
TL;DR: A multitechnique approach was conducted to investigate the confinement of caffeine in a series of UiO-66(Zr)-type MOFs, functionalized with −H, −NH2, −Br, and −2OH groups as discussed by the authors.
Journal ArticleDOI
Rapid measurement of multidimensional 1H solid-state NMR spectra at ultra-fast MAS frequencies
TL;DR: The reduction of optimal relaxation delay by radio-frequency driven recoupling (RFDR) was demonstrated on powder samples of glycine and ethenzamide with one and multi-dimensional NMR measurements.
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Improving the solubility of dexlansoprazole by cocrystallization with isonicotinamide
TL;DR: The results demonstrate the cocrystal exhibits superior apparent maximum solubility relative to the pure drug.
Journal ArticleDOI
Enhancing NMR Sensitivity of Natural-Abundance Low-γ Nuclei by Ultrafast Magic-Angle-Spinning Solid-State NMR Spectroscopy.
TL;DR: In this paper, the authors demonstrate the feasibility of acquiring high S/N ratio natural-abundance 13C NMR spectrum of a small amount of sample (~2.0 mg) by using multiple-contact cross polarization (MCP) under ultrafast magic-angle-spinning (MAS) spectroscopy.
References
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Principles of nuclear magnetic resonance in one and two dimensions
TL;DR: In this paper, the dynamics of nuclear spin systems were studied by two-dimensional exchange spectroscopy and nuclear magnetic resonance imaging (NEMI) imaging, and two different correlation methods based on coherence transfer were proposed.
Journal ArticleDOI
An Improved Broadband Decoupling Sequence for Liquid Crystals and Solids
TL;DR: It is found that a stepwise variation of the phase angle in the TPPM sequence offers even better results, and the application of this new method to a liquid crystalline compound and a solid, L-tyrosine hydrochloride, is reported.
Journal ArticleDOI
Ramped-Amplitude Cross Polarization in Magic-Angle-Spinning NMR
TL;DR: In this article, a ramped-amplitude cross-polarization sequence (RAMP-CP) was proposed for the Hartmann-Hahn matching profile in CP-MAS NMR.
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Carbon-13 nuclear magnetic resonance of polymers spinning at the magic angle
Journal ArticleDOI
Polarization of the nuclear spins of noble-gas atoms by spin exchange with optically pumped alkali-metal atoms
TL;DR: The theory of spin exchange between optically pumped alkali-inetal atoms and noble-gas nuclei is presented in this article, where the main spin interactions are assumed to be the spin-rotation interactions yN S between the rotational angular momentum N of the alkali ion and the electron spin S of the noble ion.
Related Papers (5)
Cross polarization in solids with flip-back of I-spin magnetization
J. Tegenfeldt,Ulrich Haeberlen +1 more