Proton magnetic resonance investigations of alkylammonium carboxylate micelles in nonaqueous solvents. II. Effects of carboxylate structure in benzene and in carbon tetrachloride

1973 ◽  
Vol 77 (11) ◽  
pp. 1432-1436 ◽  
Author(s):  
E. J. Fendler ◽  
J. H. Fendler ◽  
R. T. Medary ◽  
O. A. El Seoud
Keyword(s):  
Carbon Tetrachloride ◽  
Magnetic Resonance ◽  
Proton Magnetic Resonance ◽  
Nonaqueous Solvents

Carbon tetrachloride as solvent in proton magnetic resonance. Importance of size and charge effects of proximate substituents

1968 ◽  
Vol 46 (17) ◽  
pp. 2775-2781 ◽  
Author(s):  
T. Schaefer ◽  
B. Richardson ◽  
R. Schwenk
Keyword(s):  
Carbon Tetrachloride ◽  
Magnetic Resonance ◽  
Bond Length ◽  
Steric Hindrance ◽  
Proton Magnetic Resonance ◽  
Shape Effect ◽  
Proton Resonance ◽  
Charge Effects ◽  
Low Field

A model (not a theory), based on steric and charge removal characteristics of the substituents, is used to rationalize the low-field shifts caused by carbon tetrachloride (compared to cyclohexane) in the proton resonance spectra of 22 polyhalosubstituted benzenes. The low-field shifts are as large as 0.16 p.p.m. and these are found for protons situated between two ortho fluorine substituents. Larger halogens present a steric hindrance to the approach of the polarizable C—Cl bonds of the solvent and lead to smaller shifts. The charge removed from the region of the C—H bonds by the substituents is estimated by means of a function of the bond dipole divided by the bond length. A shape effect, arising when two hydrogens are ortho to each other, also appears to be present if there are bulky distant groups.

The analysis of the proton magnetic resonance spectra of heteroaromatic systems. V. Diazanaphthalenes

1965 ◽  
Vol 18 (5) ◽  
pp. 707 ◽  
Author(s):  
PJ Black ◽  
ML Heffernan
Keyword(s):  
Carbon Tetrachloride ◽  
Magnetic Resonance ◽  
Long Range ◽  
Iterative Procedure ◽  
Proton Magnetic Resonance ◽  
Chemical Shifts ◽  
Direct Calculation ◽  
Coupling Constants ◽  
Dilute Solutions ◽  
Magnetic Resonance Spectra

The proton magnetic resonance spectra of the four isomeric diazanaphthalenes, quinoxaline, phthalazine, quinazoline, and cinnoline, all as dilute solutions in carbon tetrachloride and acetone, have been investigated at 100 Mc/s. The chemical shifts and coupling constants have been obtained by direct calculation or, where appropriate, by an iterative procedure. Long-range coupling constants between protons separated by five and six bonds have been observed.

scholarly journals A Note on Proton Magnetic Resonance Spectra of Alcohols in Carbon Tetrachloride.

1960 ◽  
Vol 14 ◽  
pp. 231-232 ◽  
Author(s):  
Sture Forsén ◽  
Georg Lundgren ◽  
Lars Gunnar Sillén ◽  
Rune Söderquist
Keyword(s):  
Carbon Tetrachloride ◽  
Magnetic Resonance ◽  
Proton Magnetic Resonance ◽  
Magnetic Resonance Spectra
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