A Nuclear Magnetic Resonance Study of the Symmetry of the Proton Spins in Ethylene Sulfite in a Nematic Solvent

1972 ◽  
Vol 50 (14) ◽  
pp. 2370-2373 ◽  
Author(s):  
M. A. Raza ◽  
L. W. Reeves
Keyword(s):  
Magnetic Resonance ◽  
Nematic Phase ◽  
Resonance Spectrum ◽  
Ethylene Carbonate ◽  
Proton Magnetic Resonance Spectrum ◽  
Nuclear Magnetic Resonance Study ◽  
Coupling Constants ◽  
Magnetic Resonance Study ◽  
Nematic Solvent ◽  
Ethylene Sulfite

The proton magnetic resonance spectrum of ethylene sulfite dissolved in the nematic phase N(p-methoxybenzylidene)-p-n-butylaniline has been recorded and analyzed. The dipole–dipole coupling constants derived show that the four protons are arranged in an effective plane with C2v symmetry. The spectrum is deceptively similar to that expected for D2h symmetry but errors between the experimental and the optimized computed spectrum are unacceptably large with this assumption. The two vicinal protons cis to the extra ring oxygen are closer together than the two trans vicinal protons. A comparison is made with the molecule ethylene carbonate studied previously in the same nematic solvent.

1H nuclear magnetic resonance study of 2,2′-anhydro-O2-β-D-arabinosyluracil. Four- and five-bond coupling constants in the sugar moiety

1979 ◽  
Vol 57 (16) ◽  
pp. 2191-2195 ◽  
Author(s):  
Frank E. Hruska ◽  
James G. Dalton ◽  
Mieczyslaw Remin
Keyword(s):  
Magnetic Resonance ◽  
Long Range ◽  
Resonance Spectrum ◽  
Double Resonance ◽  
Proton Magnetic Resonance Spectrum ◽  
Nuclear Magnetic Resonance Study ◽  
Anomeric Proton ◽  
Coupling Constants ◽  
Magnetic Resonance Study ◽  
1H Nuclear Magnetic Resonance

A high resolution proton magnetic resonance spectrum for 2,2′-anhydro-O2-β-D-arabinosyluracil in aqueous solution at 80 °C is presented. The spectrum provides evidence for the presence of long-range four-bond (4J1′3′, 4J1′4′, 4J2′4′) and five-bond (5J1′5′, 5J1′5′′, 5J2′5′, 5J2′5′′) coupling interactions involving the furanose hydrogens. The 5J data represent the first reported evidence for the presence of coupling interactions involving the anomeric proton and exocyclic C5′ protons in a furanose system. The relative signs of the 4J and 5J couplings were determined by double resonance methods. The 4J and 5J interactions are discussed using crystallographic data and the theory of long-range couplings.

A nuclear magnetic resonance study of spiropentane dissolved in a nematic solvent

1969 ◽  
Vol 17 (2) ◽  
pp. 205-207 ◽  
Author(s):  
A.D. Buckingham ◽  
E.E. Burnell ◽  
C.A. de Lange
Keyword(s):  
Nuclear Magnetic Resonance ◽  
Magnetic Resonance ◽  
Nuclear Magnetic Resonance Study ◽  
Magnetic Resonance Study ◽  
Nematic Solvent ◽  
Nuclear Magnetic

Das Protonenresonanzspektrum von orientiertem Benzol in nematisch-kristallinflüssiger Lösung

1965 ◽  
Vol 20 (4) ◽  
pp. 572-580 ◽  
Author(s):  
Alfred Saupe
Keyword(s):  
Magnetic Resonance ◽  
Chemical Shift ◽  
Proton Magnetic Resonance ◽  
Resonance Spectrum ◽  
Proton Magnetic Resonance Spectrum ◽  
Coupling Constants ◽  
Scalar Coupling ◽  
Small Temperature ◽  
Theoretical Methods ◽  
Experimental Errors

The proton magnetic resonance spectrum of benzene oriented in a nematic solution is calculated using group theoretical methods. The calculations agree within experimental errors with the spectrum of benzene observed in a nematic solution of 4.4′-di-n-hexyloxy-azoxy-benzene. By an improvement of the temperature homogenity in the sample it was possible to obtain linewidths of only about 5 cps for all lines independent of the splitting. It is confirmed that the signs of the scalar coupling constants between ortho and meta protonpairs are positive. A small temperature dependence of the chemical shift of the benzene protons was found in the nematic solution. It is due to the dependence of the average orientation on the temperature.

A Nuclear Magnetic Resonance Study of Norbornadiene Partially Oriented in a Nematic Phase

1972 ◽  
Vol 50 (21) ◽  
pp. 3566-3568 ◽  
Author(s):  
E. E. Burnell ◽  
P. Diehl
Keyword(s):  
Nuclear Magnetic Resonance ◽  
Magnetic Resonance ◽  
Electron Diffraction ◽  
Nematic Phase ◽  
Nuclear Magnetic Resonance Study ◽  
Magnetic Resonance Study ◽  
Nuclear Magnetic

The n.m.r. spectrum of norbornadiene partially oriented in a nematic phase has been measured, and the geometry of the proton skeleton has been determined. The results are compared with several electron diffraction studies, and are only consistent with those in which the angle C1C7C4 is approximately 92°.

Proton magnetic resonance spectrum of thiophen dissolved in a nematic solvent

1971 ◽  
Vol 3 (5) ◽  
pp. 583-587 ◽  
Author(s):  
Jean-Marie Dereppe ◽  
Jean-Pierre Morisse ◽  
Maurice Van Meerssche
Keyword(s):  
Magnetic Resonance ◽  
Proton Magnetic Resonance ◽  
Resonance Spectrum ◽  
Proton Magnetic Resonance Spectrum ◽  
Nematic Solvent
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