𝔖 Bobbio Scriptorium
✦   LIBER   ✦

Interfacial Spin–Spin Coupling in Wood by 2D Time-Domain NMR

✍ Scribed by D.A. Oleskevich; N. Ghahramany; W.P. Weglarz; H. Peemoeller

Publisher
Elsevier Science
Year
1996
Tongue
English
Weight
145 KB
Volume
113
Category
Article
ISSN
1064-1866

No coin nor oath required. For personal study only.

✦ Synopsis

Magnetization exchange between the solid-wood component and results is further complicated in the presence of magnetizawater was studied in hydrated aspen wood by 2D NMR timetion exchange between spin groups, in which case observed domain spectroscopy. Analysis of the relaxation results for exrelaxation times and component magnetization fractions may change shows that a three-site system (water and two wood combe different from the intrinsic values. However, the intrinsic ponents) is involved and that the water protons are strongly relaxation parameters are essential for meaningful woodcoupled (a wood-to-water exchange rate of 640 s 01 ) to the waterwater component characterization. In such cases, the desired accessible wood protons, which in turn are less strongly coupled intrinsic relaxation parameters are obtainable by first acquir-(a wood-to-wood exchange rate of 64 s 01 ) to the water-inaccessible ing and analyzing relaxation data using spin-group resoluwood protons.

📜 SIMILAR VOLUMES

Long-range proton spin-spin coupling in
Long-range proton spin-spin coupling in rigid cyclic structures by 2D NMR/‘through-space coupling’
✍ Harald Schröder; Ernst Haslinger 📂 Article 📅 1994 🏛 John Wiley and Sons 🌐 English ⚖ 328 KB

## Abstract In H,H COSY spectra of rigid cyclic terpenes, many long‐range couplings can be observed. The coupled nuclei are connected either by a zig‐zag coupling path or they are close in space. The latter are called ‘through‐space’ coupling. A certain stereospecific relationship between the coupl

Determination of High-Spin Iron(III)–Nit
Determination of High-Spin Iron(III)–Nitroxyl Distances in Spin-Labeled Porphyrins by Time-Domain EPR
✍ Margaret H. Rakowsky; Ana Zecevic; Gareth R. Eaton; Sandra S. Eaton 📂 Article 📅 1998 🏛 Elsevier Science 🌐 English ⚖ 297 KB

## Continuous wave EPR spectra of the nitroxyl signals for four Continuous wave (CW) electron paramagnetic resonance spin-labeled high-spin (h.s.) Fe(III) porphyrins showed partially (EPR) has been used to obtain electron-electron interspin resolved splittings at temperatures near 4 K. Axial ligan

Nmr studies on the presence of domain st
Nmr studies on the presence of domain structures in polysaccharides. II. 1H spin--lattice relaxation time dispersion
✍ Serge Lacelle; Bernard C. Gerstein 📂 Article 📅 1988 🏛 Wiley (John Wiley & Sons) 🌐 English ⚖ 424 KB 👁 2 views

The behavior of 'H-nmr spin-lattice relaxation times as a function of frequency is examined for powders of a-and /3-cyclodextrins, dextran B512F, and their "deuterated" analogues, where deuterium replaces exchangeable protons. A crossover from two-to one-component relaxation decays is observed with