Chemical shifts of the coalesced hydroxy proton resonance signal and departures from ideality in aqueous alcohol mixtures II. Methanol-water, ethanol-water, propanol-1-water, and propanol-2-water systems

1971 ◽  
Vol 5 (1) ◽  
pp. 73-77
Author(s):  
James R Kuppers ◽  
Neil E Carriker
Keyword(s):  
Chemical Shifts ◽  
Water Systems ◽  
Aqueous Alcohol ◽  
Proton Resonance ◽  
Resonance Signal ◽  
Hydroxy Proton ◽  
Alcohol Mixtures

THE ANALYSIS OF NUCLEAR MAGNETIC RESONANCE SPECTRA: III. PYRIDINE AND DEUTERATED PYRIDINES

1957 ◽  
Vol 35 (12) ◽  
pp. 1487-1495 ◽  
Author(s):  
W. G. Schneider ◽  
H. J. Bernstein ◽  
J. A. Pople
Keyword(s):  
Nuclear Magnetic Resonance ◽  
Magnetic Resonance ◽  
High Resolution ◽  
Chemical Shifts ◽  
Coupling Constants ◽  
Spin Coupling ◽  
Calculated Spectrum ◽  
Proton Resonance ◽  
Nuclear Magnetic Resonance Spectra ◽  
Spin Coupling Constants

The proton resonance spectra of pyridine, 2,6-pyridine-d2, 3-pyridine-d1, and 4-pyridine-d1 have been obtained for the pure liquids under conditions of high resolution. The spectra have been analyzed as proton groupings of AB2X2, AB2, perturbed ABX, and B2X2 respectively. The spin-coupling constants obtained from analysis of the simpler spectra of the deuterated molecules were used to suggest trial solutions for the analysis of the complicated AB2X2 spectrum of pyridine. A final set of chemical shifts and spin-coupling constants derived for pyridine give satisfactory agreement between the observed and calculated spectrum.

Messung kernmagnetischer Relaxationszeiten in Hochauflösung mittels schneller adiabatischer Passagen

1970 ◽  
Vol 25 (11) ◽  
pp. 1674-1680
Author(s):  
Hans Lütje
Keyword(s):  
High Resolution ◽  
Polyethylene Oxide ◽  
Magnetic Relaxation ◽  
Chemical Shifts ◽  
Signal To Noise Ratio ◽  
Relaxation Times ◽  
Resonance Signal ◽  
Additional Equipment ◽  
Relaxation Measurements ◽  
Fast Passage

Abstract The nuclear magnetic relaxation times T1 and T2 may be determined by observing the relaxation that follows after a stop of an adiabatic fast passage at different points of the resonance signal. High resolution measurements are possible with external proton stabilization during the relaxation process if the chemical shifts are larger than 1 ppm and the relaxation times are longer than 1 sec. If no high resolution is required the lower limit is 0.2 seconds. Relaxation measurements are possible using conventional NMR-spectrometers without additional equipment. Since the signal to noise ratio is favourable, rather dilute solutions may be investigated. Relaxation measurements on benzene, on 4 different protons of 4-dimethylamino-benzaldehyde and on polyethylene oxide in solution are reported.

Permselectivity of cation-exchange membranes between different cations in aqueous alcohol mixtures

2016 ◽  
Vol 192 ◽  
pp. 489-496 ◽  
Author(s):  
T. Rottiers ◽  
J. De Staelen ◽  
B. Van der Bruggen ◽  
L. Pinoy
Keyword(s):  
Cation Exchange ◽  
Aqueous Alcohol ◽  
Alcohol Mixtures

Protonenresonanz-Spektroskopie ungesättigter Ringsysteme I

1965 ◽  
Vol 20 (10) ◽  
pp. 948-956 ◽  
Author(s):  
Harald Günther
Keyword(s):  
Magnetic Resonance ◽  
Concentration Dependence ◽  
Proton Magnetic Resonance ◽  
Chemical Shifts ◽  
Electron System ◽  
Coupling Constants ◽  
Resonance Signal ◽  
Aromatic Character ◽  
Additional Support ◽  
Magnetic Resonance Spectra

The proton magnetic resonance spectra of 1.6-methano- and 1.6-oxido-cyclodecapentaene are described and analyzed in terms of chemical shifts and coupling constants. The results are discussed in connection with the structure and possible aromatic character of these compounds. Measurements of the concentration dependence of the chloroform resonance signal in solutions of both compounds give additional support for the presence of a delocalized 10 π-electron system.

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