Survey of NMR experiments for the determination ofnJ(C,H) heteronuclear coupling constants in small molecules

2001 ◽  
Vol 39 (9) ◽  
pp. 499-530 ◽  
Author(s):  
Brian L. Marquez ◽  
William H. Gerwick ◽  
R. Thomas Williamson
Keyword(s):  
Small Molecules ◽  
Coupling Constants ◽  
Heteronuclear Coupling

Gradient-Enhanced Inverse-Detected NMR Techniquesfor Determination of 1H-15N Coupling Constants in 2,2-Dimethylpenta-3,4-dienal Derivatives

1997 ◽  
Vol 62 (11) ◽  
pp. 1747-1753 ◽  
Author(s):  
Radek Marek
Keyword(s):  
Double Bond ◽  
Chemical Shifts ◽  
Multiple Bond ◽  
Coupling Constants ◽  
Single Quantum ◽  
Nmr Techniques ◽  
Phase Sensitive ◽  
Heteronuclear Coupling

Determination of 15N chemical shifts and heteronuclear coupling constants of substituted 2,2-dimethylpenta-3,4-dienal hydrazones is presented. The chemical shifts were determined by gradient-enhanced inverse-detected NMR techniques and 1H-15N coupling constants were extracted from phase-sensitive gradient-enhanced single-quantum multiple bond correlation experiments. Stereospecific behaviour of the coupling constants 2J(1H,15N) and 1J(1H,13C) has been used to determine the configuration on a C=N double bond. The above-mentioned compounds exist predominantly as E isomers in deuteriochloroform.

Measurement of long-range heteronuclear coupling constants

1989 ◽  
Vol 85 (1) ◽  
pp. 111-131 ◽  
Author(s):  
Jeremy J Titman ◽  
David Neuhaus ◽  
James Keeler
Keyword(s):  
Long Range ◽  
Coupling Constants ◽  
Heteronuclear Coupling

Relaxation and linewidths in some nuclear magnetic resonance spectra

1965 ◽  
Vol 286 (1406) ◽  
pp. 337-351 ◽  
Keyword(s):  
Small Molecules ◽  
Dipolar Coupling ◽  
Coupling Constants ◽  
Nuclear Relaxation ◽  
Dipolar Field ◽  
Butyl Ether ◽  
Nuclear Magnetic Resonance Spectra ◽  
Random Magnetic Field ◽  
Line Widths ◽  
Viscous Solutions

Measurements of linewidths in conventional high resolution spectra have been used to investigate mechanisms of nuclear relaxation in viscous solutions. The line widths for ABX and A 2 X 2 systems have been calculated by means of Redfield’s theory and assuming relaxation by a random magnetic field; these are tabulated. The linewidths for an ABX system relaxing through the dipolar coupling of nuclei A and B are also tabulated. The mechanism of relaxation of a variety of small molecules in viscous solutions was found to be an intermolecular process, but not to be due to a dipolar field (such as would arise from a nuclear or electron spin). The relative signs of certain coupling constants in ABX and A 2 X 2 systems, which cannot be determined by analysis of the spectrum, can be found from such measurements; this is demonstrated for vinyl n -butyl ether and 1,2-dibromotetrafluorobenzene.

scholarly journals CSSF-CLIP-HSQMBC: measurement of heteronuclear coupling constants in severely crowded spectral regions

RSC Advances ◽  
2019 ◽  
Vol 9 (62) ◽  
pp. 36082-36087 ◽  
Author(s):  
Aitor Moreno ◽  
Kine Østnes Hansen ◽  
Johan Isaksson
Keyword(s):  
Chemical Shift ◽  
Long Range ◽  
Program Development ◽  
Coupling Constants ◽  
Selective Filtration ◽  
User Friendly ◽  
Heteronuclear Coupling

A new pulse program development, a chemical shift selective filtration clean in-phase HSQMBC (CSSF-CLIP-HSQMBC), is presented for the user-friendly measurement of long-range heteronuclear coupling constants in severely crowded spectral regions.

scholarly journals Accurate determination of one-bond heteronuclear coupling constants with “pure shift” broadband proton-decoupled CLIP/CLAP-HSQC experiments

2014 ◽  
Vol 239 ◽  
pp. 130-138 ◽  
Author(s):  
István Timári ◽  
Lukas Kaltschnee ◽  
Andreas Kolmer ◽  
Ralph W. Adams ◽  
Mathias Nilsson ◽  
...  
Keyword(s):  
Accurate Determination ◽  
Coupling Constants ◽  
Heteronuclear Coupling
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