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NMR spectroscopy in partially oriented phases. Routine 2H NMR of small to medium sized molecules

✍ Scribed by Gábor Szalontai

Publisher
John Wiley and Sons
Year
2000
Tongue
English
Weight
681 KB
Volume
38
Category
Article
ISSN
0749-1581

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✦ Synopsis

2 H NMR spectra of deuterated molecules were recorded in the lyotropic liquid crystalline phase formed by the chiral polypeptide poly--benzyl-L-glutamate (PBLG) and a co-solvent. Under such circumstances the incompletely averaged quadrupolar effects superimpose on the Zeeman terms. It is demonstrated that substantial enhancements of signal dispersion can be obtained in this way and it is suggested that practically all 2 H NMR spectra should be recorded in liquid crystalline ternary mixtures. Furthermore, it is also confirmed that, because the residual quadrupolar splittings are probes of local order and molecular dynamics, additional structural or motional information can be obtained from the spectra. By proving that high resolution (<2-6 Hz) can be achieved even in a 1 mm i.d. capillary, the quantity of the required PBLG could be reduced by a factor of 10.

📜 SIMILAR VOLUMES

The rα-structure of partially oriented 1
The rα-structure of partially oriented 1,2,3,5-tetrachlorobenzene determined from its 1H NMR spectra with natural-abundance 13C-satellites. A Demonstration of the Combined Use of Spectra Obtained from Molecules Dissolved in Several Different Liquid Crystals as Solvents for Spin Systems not having enough Dipolar Coupling Constants to Determine the Molecular Structure
✍ G. Dombi; J. Amrein; P. Diehl 📂 Article 📅 1980 🏛 John Wiley and Sons 🌐 English ⚖ 322 KB

## Abstract It is demonstrated that in a case where neither the proton nor the natural‐abundance ^13^C‐satellite spectra of a partially oriented molecule carry enough structural information, one can determine the entire molecular geometry by the combined use of several liquid crystals as solvents.