Nuclear magnetic resonance studies of the solvation of phosphorus(V) selenides, 1,2-bis(diphenylphosphino)ethane, and tris(dimethylamino)phosphine telluride by sulfur dioxide

1979 ◽  
Vol 57 (7) ◽  
pp. 754-761 ◽  
Author(s):  
Philip A. W. Dean
Keyword(s):  
Nuclear Magnetic Resonance ◽  
Magnetic Resonance ◽  
Complex Formation ◽  
Nmr Spectra ◽  
Chemical Reactivity ◽  
Magnetic Resonance Studies ◽  
Spectral Changes ◽  
Thermodynamic Constants ◽  
Inert Solvent ◽  
Accompany Change

31P and 77Se nmr spectra have been measured for a range of phosphorus(V) selenides, diphosphorus(V) diselenides, and triphosphorus(V) triselenides in the inert solvent CH2Cl2 and in liquid SO2. Significant roughly-correlated reductions in |1J(PSe)| and deshielding of the 77Se resonance accompany change of solvent from CH2Cl2 to SO2. These changes are shown to arise from 1:1 phosphorus(V) selenide:SO2 donor:acceptor complex formation. Approximate thermodynamic constants for the formation of the complexes have been determined and possible structures for the 1:1 complexes with the diphosphorus(V) diselenides discussed. It is shown from 1H and 31P nmr spectral changes that Ph2P(CH2)2PPh2 forms a 1:1 complex with SO2, and approximate thermodynamic data for the SO2 complexation of the diphosphine have been established. Complexation is indicated by changes in both |1J(PTe)| and δP when (Me2N)3PTe is dissolved in SO2, but the chemical reactivity of this system precluded detailed study.

13C nuclear magnetic resonance studies. 58. 13C spectra of a variety of bicyclo[2.2.2]octane derivatives. Further definition of the deshielding δ effect

1976 ◽  
Vol 54 (6) ◽  
pp. 917-925 ◽  
Author(s):  
J. B. Stothers ◽  
C. T. Tan
Keyword(s):  
Nuclear Magnetic Resonance ◽  
Magnetic Resonance ◽  
Nmr Spectra ◽  
Magnetic Resonance Studies ◽  
13C Nuclear Magnetic Resonance ◽  
Definition Of ◽  
C Nmr ◽  
Nuclear Magnetic

The 13C nmr spectra of 35 bicyclo[2.2.2]octane and -octene derivatives have been determined to extend our examinations of the effects of stereochemistry on the shieldings of closely neighboring carbons. This series includes a variety of methyl substituted bicyclooctanols and -octenols as well as the corresponding hydrocarbons and some bicyclooctanones. With the bicyclo[2.2.2]octane skeleton it is possible to examine an array of systems having substituents separated by three and four bonds in a variety of orientations. The interactions, termed γ and δ effects, respectively, produce distinctive shielding variations which are useful for stereochemical elucidations. Particularly interesting are the pronounced shifts observed for the carbons bearing closely neighboring substituents. Characteristically, for vicinal substituents, these carbons are shielded while for syn-axial δ interactions, these carbons are deshielded by as much as 8.6 ppm. The results are compared with the trends found in other sterically crowded Systems.

scholarly journals Nuclear Magnetic Resonance Studies of the Complex Formation of Mercuric Chloride with L-Cysteine and with Glutathione

1977 ◽  
Vol 9 (5) ◽  
pp. 471-478 ◽  
Author(s):  
Yukio Katono ◽  
Yoshio Inoue ◽  
Riichirô Chûjô
Keyword(s):  
Nuclear Magnetic Resonance ◽  
Magnetic Resonance ◽  
Complex Formation ◽  
Mercuric Chloride ◽  
Magnetic Resonance Studies ◽  
Nuclear Magnetic

125Te Fourier transform nuclear magnetic resonance studies of tellurium compounds

1982 ◽  
Vol 60 (17) ◽  
pp. 2256-2258 ◽  
Author(s):  
Raj K. Chadha ◽  
Jack M. Miller
Keyword(s):  
Nuclear Magnetic Resonance ◽  
Fourier Transform ◽  
Magnetic Resonance ◽  
Phenyl Ring ◽  
Nmr Spectra ◽  
Broad Line ◽  
Magnetic Resonance Studies ◽  
Line Widths ◽  
Organotellurium Compounds ◽  
Nuclear Magnetic

125Te nmr spectra of a number of organotellurium compounds and inorganic tellurium salts are reported. The tellurium shielding has been found to be dependent upon the nature and number of electronegative substituents bonded to tellurium and where applicable, upon the para substituents on the phenyl ring. Possible reasons for the observed broad line widths are discussed.

Amino-acid zwitterion equilibria: vibrational and nuclear magnetic resonance studies of methyl-substituted thiazolidine-4-carboxylic acids

1986 ◽  
Vol 64 (6) ◽  
pp. 1215-1219 ◽  
Author(s):  
H. E. Howard-Lock ◽  
C. J. L. Lock ◽  
M. L. Martins ◽  
P. S. Smalley ◽  
R. A. Bell
Keyword(s):  
Nuclear Magnetic Resonance ◽  
Amino Acid ◽  
Magnetic Resonance ◽  
Infrared Spectra ◽  
Nmr Spectra ◽  
Infrared And Raman Spectra ◽  
Solid Samples ◽  
Magnetic Resonance Studies ◽  
Cysteine Hydrochloride ◽  
C Nmr

Infrared and Raman spectra (4000–100 cm−1) of solid samples of six different methyl substituted thiazolidine products of D-penicillamine and L-cysteine hydrochloride have been observed and assigned. Infrared spectra in D2O solutions have been obtained for comparison in order to study the amino-acid zwitterion equilibria. Proton and 13C nmr spectra for the compounds have also been measured.

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