✦ LIBER ✦

Effect of 1H-decoupling in two-dimensional multiple-quantum MAS NMR spectroscopy of 23Na in a hydrous layered silicate

✍ Scribed by Minoru Hanaya; Robin K Harris

Publisher: Elsevier Science
Year: 1997
Tongue: English
Weight: 112 KB
Volume: 8
Category: Article
ISSN: 0926-2040
DOI: 10.1016/s0926-2040(96)01295-7

No coin nor oath required. For personal study only.

✦ Synopsis

In order to check the efficiency of high-power 1 H decoupling when used with the two-dimensional multiple-quantum MAS method recently proposed to obtain isotropic spectra from quadrupolar nuclei, we applied this new technique to 23 Na NMR for a hydrous layered silicate compound, makatite, with and without 1 H decoupling. A remarkable improvement of the spectral resolution in the isotropic dimension was observed by the decoupling, showing that it is effective in the 2D MQ-MAS method and suggesting that proton decoupling should be generally applied in 23 Na experiments concerning these kinds of compound. q 1997 Elsevier Science B.V.

📜 SIMILAR VOLUMES

Two-dimensional triple-quantum 23Na MAS

Two-dimensional triple-quantum 23Na MAS NMR spectroscopy of sodium cations in dehydrated zeolites

✍ M. Hunger; P. Sarv; A. Samoson 📂 Article 📅 1997 🏛 Elsevier Science 🌐 English ⚖ 448 KB

Two-dimensional triple-quantum (2D-3Q) 23Na MAS NMR spectroscopy has been applied for the investigation of sodium cations in dehydrated zeolites NaY, NaEMT, NaZSM-5 and NaMOR. The experiments have shown that the new 2D-3Q technique allows the determination of the isotropic chemical shifts and quadru

Selective detection of multiple quantum

Selective detection of multiple quantum transitions in NMR by two-dimensional spectroscopy

✍ A. Wokaun; R.R. Ernst 📂 Article 📅 1977 🏛 Elsevier Science 🌐 English ⚖ 1019 KB

A technique is dcrcribcd for the selective detection of multiple quantum transitions by means of two-dimensional spcctroscopy. The separation of various orders of transitions is based on characteristic transformation properties of multiple quantum transitions permitting an orthogonal expansion of t

NMR Spectroscopy of Organolithium Compou

NMR Spectroscopy of Organolithium Compounds, XV[1]. Two-Dimensional6Li,1H-NMR Shift Correlation by Multiple Quantum Spectroscopy and Polarization Transfer: New Tools for Structural Research in the Field of Organolithium Compounds

✍ Mons, Hans-Egbert ;Günther, Harald ;Maercker, Adalbert 📂 Article 📅 1993 🏛 Wiley (John Wiley & Sons) 🌐 English ⚖ 404 KB 👁 1 views

Thermodynamic origin of cis/trans isomer

Thermodynamic origin of cis/trans isomers of a proline-containing β-turn model dipeptide in aqueous solution: A combined variable temperature 1H-NMR, two-dimensional 1H,1H gradient enhanced nuclear overhauser effect spectroscopy (NOESY), one-dimensional steady-state intermolecular 13C,1H NOE, and molecular dynamics study

✍ Anastasios Troganis; Ioannis P. Gerothanassis; Zafiria Athanassiou; Thomas Mavro 📂 Article 📅 2000 🏛 Wiley (John Wiley & Sons) 🌐 English ⚖ 178 KB 👁 1 views

The cis/trans conformational equilibrium of the two Ac-Pro isomers of the beta-turn model dipeptide [13C]-Ac-L-Pro-D-Ala-NHMe, 98% 13C enriched at the acetyl carbonyl atom, was investigated by the use of variable temperature gradient enhanced 1H-nmr, two-dimensional (2D) 1H,1H nuclear Overhauser eff