Proton magnetic resonance investigation of the system zinc perchlorate–methanol: evidence for the association of zinc and perchlorate ions

1969 ◽  
Vol 47 (8) ◽  
pp. 1417-1421 ◽  
Author(s):  
S. A. Al-Baldawi ◽  
T. E. Gough
Keyword(s):  
Magnetic Resonance ◽  
Temperature Dependence ◽  
Proton Magnetic Resonance ◽  
Resonance Spectrum ◽  
Solvation Shell ◽  
Proton Magnetic Resonance Spectrum ◽  
Kcal Mole ◽  
Resonance Investigation ◽  
Line Widths ◽  
Magnetic Resonance Investigation

The proton magnetic resonance spectrum of the system zinc perchlorate–methanol is reported for a range of sample concentrations and temperatures. The results are interpreted in terms of association between the zinc and perchlorate ions, and the various features of the spectrum discussed in terms of this interaction. From the temperature-dependence of line-widths, Ea = 14 ± 2 kcal mole−1 and log10A = 16 ± 3 are estimated for the molecular exchange of methanol from the solvation shell of zinc into the bulk solvent.

A PROTON MAGNETIC RESONANCE INVESTIGATION OF ROTATIONAL ISOMERISM IN 1,1,2,2-TETRACHLORO-1-FLUOROETHANE

1961 ◽  
Vol 39 (1) ◽  
pp. 39-41 ◽  
Author(s):  
R. J. Abraham ◽  
H. J. Bernstein
Keyword(s):  
Magnetic Resonance ◽  
Proton Magnetic Resonance ◽  
Resonance Spectrum ◽  
Rotational Isomerism ◽  
Coupling Constants ◽  
Proton Resonance ◽  
Resonance Investigation ◽  
Magnetic Resonance Investigation

The doublet separation in the proton resonance spectrum of the liquid was measured from −53 to 100 °C. From the variation of the separation with temperature approximate values of the trans and gauche HF coupling constants were obtained. The values of ΔH ≈ 400 cal/mole and ΔS ≈ 0 are also consistent with the data.

TEMPERATURE AND SOLVENT EFFECTS ON THE PROTON MAGNETIC RESONANCE SPECTRUM OF BIS(2,2-DICHLOROCYCLOPROPYL) ETHER

1963 ◽  
Vol 41 (8) ◽  
pp. 1857-1866 ◽  
Author(s):  
H. M. Hutton ◽  
T. Schaefer
Keyword(s):  
Magnetic Resonance ◽  
Complex Formation ◽  
Temperature Dependence ◽  
Solvent Effects ◽  
Proton Magnetic Resonance ◽  
Resonance Spectrum ◽  
Heat Of Formation ◽  
Proton Magnetic Resonance Spectrum ◽  
Entropy Of Formation

The proton magnetic resonance spectrum of bis(2,2-dichlorocyclopropyl) ether consists of two partially overlapping ABX spectra due to the meso and d,l isomers. A study of the temperature dependence of the spectra in different solvents demonstrates the existence of complex formation with benzene. It is found that for the most abundant isomer the heat of formation of the complex is −1700 ± 100 cal/mole, entropy of formation is −6.2 ± 0.3 e.u. The association shifts are 52 ± 2 c.p.s., 64 ± 5 c.p.s., and 88 ± 5 c.p.s. at 60 Mc/s for the three protons situated at different points in the molecule.

Proton magnetic resonance spectrum of 4-pyrone, chromone and xanthone

1966 ◽  
Vol 22 (7) ◽  
pp. 1391
Author(s):  
Caroline T. Mathis ◽  
J.H. Goldstein
Keyword(s):  
Magnetic Resonance ◽  
Proton Magnetic Resonance ◽  
Resonance Spectrum ◽  
Proton Magnetic Resonance Spectrum
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