Proton chemical shifts and hydrogen bonding in the ternary system carbon tetrachloride-dioxane-water

1967 ◽  
Vol 71 (3) ◽  
pp. 568-572 ◽  
Author(s):  
Norbert Muller ◽  
Paul Simon
Keyword(s):  
Hydrogen Bonding ◽  
Carbon Tetrachloride ◽  
Ternary System ◽  
Chemical Shifts ◽  
Proton Chemical Shifts

Temperature dependence of proton magnetic resonance solvent shifts. 3,5-Dichlorosalicylaldehyde in carbon tetrachloride and benzene

1968 ◽  
Vol 46 (19) ◽  
pp. 3110-3112 ◽  
Author(s):  
G. Kotowycz ◽  
T. Schaefer
Keyword(s):  
Carbon Tetrachloride ◽  
Temperature Dependence ◽  
Proton Magnetic Resonance ◽  
Benzene Solution ◽  
Chemical Shifts ◽  
Relative Temperature ◽  
Proton Shift ◽  
Solvent Shifts ◽  
Solvent Molecules ◽  
Proton Chemical Shifts

The ring proton chemical shifts of 3,5-dichlorosalicylaldehyde as a function of temperature in carbon tetrachloride and benzene solutions indicate that if there is association with solvent molecules in benzene solution, then there is also association with carbon tetrachloride solvent molecules. The aldehydic proton shift shows a much smaller (relative) temperature dependence in the carbon tetrachloride solution.

scholarly journals Supplementary material to "Anomalous Amide Proton Chemical Shifts as Signatures of Hydrogen Bonding to Aromatic Sidechains"

2021 ◽  
Author(s):  
Kumaran Baskaran ◽  
Colin W. Wilburn ◽  
Jonathan R. Wedell ◽  
Leonardus M. I. Koharudin ◽  
Eldon L. Ulrich ◽  
...  
Keyword(s):  
Hydrogen Bonding ◽  
Chemical Shifts ◽  
Amide Proton ◽  
Supplementary Material ◽  
Proton Chemical Shifts

Accurate ab initio calculations of O–H⋯O and O–H⋯−O proton chemical shifts: towards elucidation of the nature of the hydrogen bond and prediction of hydrogen bond distances

2015 ◽  
Vol 13 (33) ◽  
pp. 8852-8868 ◽  
Author(s):  
Michael G. Siskos ◽  
Andreas G. Tzakos ◽  
Ioannis P. Gerothanassis
Keyword(s):  
Hydrogen Bond ◽  
Hydrogen Bonding ◽  
Ab Initio Calculations ◽  
Ab Initio ◽  
Chemical Shifts ◽  
Bond Lengths ◽  
Sensitive Measure ◽  
Proton Chemical Shifts

Ab initio calculations of O–H⋯O and O–H⋯−O 1H chemical shifts provide accurate electronic description of hydrogen bonding and sensitive measure of hydrogen bond lengths.

Nuclear magnetic resonance studies of hydrogen bonding in acetylenes containing oxygen functions

1969 ◽  
Vol 47 (13) ◽  
pp. 2473-2477 ◽  
Author(s):  
W. E. Bentz ◽  
L. D. Colebrook
Keyword(s):  
Nuclear Magnetic Resonance ◽  
Hydrogen Bonding ◽  
Carbon Tetrachloride ◽  
Magnetic Resonance ◽  
Infinite Dilution ◽  
Chemical Shifts ◽  
Proton Acceptor ◽  
Acceptor Site ◽  
Magnetic Resonance Studies ◽  
Nuclear Magnetic

Dilution shifts in carbon tetrachloride and cyclohexane solution have been obtained for the terminal acetylenic proton signals in the nuclear magnetic resonance (n.m.r.) spectra of some acetylenes. The presence of an oxygen atom results in a significant increase in the magnitude of the dilution shift, suggesting that oxygen is an important proton acceptor site in these compounds. Steric influences on the dilution shift and differences between the infinite dilution chemical shifts in the two solvents used, have been observed.

RING-PROTON CHEMICAL SHIFTS OF SOME SUBSTITUTED ANILINES IN CARBON TETRACHLORIDE AND TRIFLUOROACETIC ACID

1963 ◽  
Vol 41 (9) ◽  
pp. 2339-2345 ◽  
Author(s):  
W. F. Reynolds ◽  
T. Schaefer
Keyword(s):  
Carbon Tetrachloride ◽  
Steric Hindrance ◽  
Trifluoroacetic Acid ◽  
Electronic Spectra ◽  
Chemical Shifts ◽  
Substituent Effects ◽  
Amino Group ◽  
Substituted Anilines ◽  
Ring Proton ◽  
Proton Chemical Shifts

The chemical shifts of the ring-proton spectra of a series of substituted anilines are reported relative to internal benzene in the solvents carbon tetrachloride and trifluoroacetic acid. The substituent parameters in cyclohexane derived by Martin can be used together with our parameters for the para-fluoro and -ammonio (NH3+) groups to demonstrate additivity of the substituent effects in both carbon tetrachloride and trifluoroacetic acid. The somewhat puzzling ring-proton shifts in the latter solvent are attributed to counterion effects arising from a juxtaposition of the two centers of charge. Steric hindrance to π-overlap of the amino group with the ring is demonstrated in certain cases and a parallel behavior is found between the ring-proton shifts and the electronic spectra of these molecules.

Hydrogen bonding in sulfanes

1968 ◽  
Vol 46 (22) ◽  
pp. 3587-3590 ◽  
Author(s):  
E. Muller ◽  
J. B. Hyne
Keyword(s):  
Nuclear Magnetic Resonance ◽  
Hydrogen Bonding ◽  
Resonance Spectrum ◽  
Chemical Shifts ◽  
Intramolecular Hydrogen Bonding ◽  
Supporting Evidence ◽  
Absorption Bands ◽  
Hydrogen Bonding Interactions ◽  
Intramolecular Hydrogen ◽  
Proton Chemical Shifts

The position of the proton signals in the nuclear magnetic resonance spectrum of sulfanes (H2Sx) is dependent on the sulfur chain length, the sulfane concentration, and the temperature. These proton chemical shifts are interpreted in terms of sulfane–sulfane interactions and intramolecular hydrogen bonding in sulfanes. Supporting evidence is provided by the position and appearance of the SH-absorption bands of the sulfanes in the infrared, which also establishes the existence of sulfane–solvent interactions.It is concluded that sulfanes participate in hydrogen bonding interactions and it is suggested that there may be a special type of intramolecular hydrogen bonding operative in H2S3.

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