Direct proton magnetic resonance cation hydration and complex formation study of lanthanide salt solutions in water-acetone mixtures

1973 ◽  
Vol 12 (9) ◽  
pp. 2066-2071 ◽  
Author(s):  
Anthony Fratiello ◽  
Vicki Kubo ◽  
George A. Vidulich
Keyword(s):  
Magnetic Resonance ◽  
Complex Formation ◽  
Proton Magnetic Resonance ◽  
Salt Solutions ◽  
Cation Hydration

Solvent effects in ultraviolet spectral studies of hydrogen bonding between phenol and N,N-dimethylacetamide

1967 ◽  
Vol 45 (18) ◽  
pp. 2033-2038 ◽  
Author(s):  
F. Takahashi ◽  
W. J. Karoly ◽  
J. B. Greenshields ◽  
N. C. Li
Keyword(s):  
Hydrogen Bonding ◽  
Magnetic Resonance ◽  
Complex Formation ◽  
Equilibrium Constant ◽  
Proton Magnetic Resonance ◽  
Mixed Solvent ◽  
Resonance Method ◽  
Spectral Studies ◽  
Magnetic Resonance Method ◽  
Hydrogen Bonded

Ultraviolet spectral studies of hydrogen bonding between phenol and N,N-dimethylacetamide (DMA) in several media are reported. The equilibrium constant for the formation of the phenol–DMA complex is strongly solvent dependent, varying from 295 1/mole in cyclohexane to 130 in CCl4 and 16 in CHCl3, all at 28°. The greatly reduced value in CHCl3 indicates that the measured equilibrium constant is only an apparent one which does not take into account the decrease in free DMA concentration resulting from hydrogen-bonded complex formation with the solvent acting as hydrogen donor. In CCl4/CHCl3 mixed solvent, in the range of [chloroform] = 0 to 1.227 M, the measured equilibrium constant, K′, varies linearly with K′ [chloroform]. The slope of the line corresponds to the equilibrium constant for the formation of the hydrogen-bonded complex between CHCl3 and DMA in CCl4. The value, 0.9 1/mole, agrees with that obtained from a proton magnetic resonance method. The agreement is particularly noteworthy when we consider that the concentrations of phenol used in the proton magnetic resonance and ultraviolet spectral methods differ by a factor of 200, which leads definitely to the conclusion that the hydrogen-bonded CHCl3–DMA complex formed is 1:1. In cyclohexane/CHCl3 mixed solvent, similar results are obtained.

PROTON MAGNETIC RESONANCE AND INFRARED SPECTRA OF SOME COMPLEXES OF N,N-DIMETHYLACETAMIDE

1966 ◽  
Vol 44 (16) ◽  
pp. 1881-1887 ◽  
Author(s):  
A. J. Carty
Keyword(s):  
Magnetic Resonance ◽  
Complex Formation ◽  
Infrared Spectra ◽  
Proton Magnetic Resonance ◽  
Low Field ◽  
New Compounds ◽  
Solid Complexes ◽  
Magnetic Resonance Spectra

Proton magnetic resonance spectra of some complexes of In, Zn, Cd, and Sn halides and perchlorates with N,N-dimethylacetamide (DMA) have been measured in acetone-d6. Low field shifts of the methyl resonances of DMA on complex formation are dependent on metal and anion. The similarity of the spectra of all the complexes suggests only oxygen-coordinated DMA in solution. Infrared spectra in the range 2 000–625 cm−1 are recorded. Changes in the C—O and C—N stretching frequencies of the ligand on coordination are consistent with oxygen-bonded DMA both in the solid complexes and in solution.The new compounds Zn(ClO4)2•6DMA, Cd(ClO4)2•6DMA, CdI2•2DMA, and SnCl4•2DMA are reported.

Lanthanide Induced Shifts in the Proton Magnetic Resonance Spectra of Cyclic Amines

1973 ◽  
Vol 51 (24) ◽  
pp. 4080-4081 ◽  
Author(s):  
Donald L. Hooper ◽  
Alzbeta Kardos
Keyword(s):  
Magnetic Resonance ◽  
Complex Formation ◽  
Proton Magnetic Resonance ◽  
Steric Effect ◽  
Cyclic Amines ◽  
Lanthanide Induced Shifts ◽  
Magnetic Resonance Spectra

Complex formation between europium tris(dipivalatomethane), Eu(DPM)3, and cyclic amines is not accompanied by inversion of the amine configuration, even for 2-alkyl and 2,6-dialkylpiperidines, where inversion of the amine configuration accompanies formation of the usual amine derivatives. There is, however, a steric effect of C-2 or C-6 substitution, in that the magnitude of the lanthanide induced shifts is sharply reduced.

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.

Direct proton magnetic resonance cation hydration study of lanthanum, zinc, cerium, iron, and nickel perchlorates and erbium nitrate in aqueous solution

1971 ◽  
Vol 10 (11) ◽  
pp. 2552-2557 ◽  
Author(s):  
Anthony Fratiello ◽  
Vicki Kubo ◽  
Shirley Peak ◽  
Bernard Sanchez ◽  
Ronald E. Schuster
Keyword(s):  
Aqueous Solution ◽  
Magnetic Resonance ◽  
Proton Magnetic Resonance ◽  
Erbium Nitrate ◽  
Cation Hydration
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