Determination of the relative number of monohydride and dihydride bonding sites in amorphous silicon-hydrogen alloys using pulsed NMR techniques

1981 ◽  
Vol 38 (2) ◽  
pp. 113-116 ◽  
Author(s):  
M. Lowry ◽  
F.R. Jeffrey ◽  
R.G. Barnes ◽  
D.R. Torgeson
Keyword(s):  
Amorphous Silicon ◽  
Relative Number ◽  
Nmr Techniques ◽  
Pulsed Nmr

Comparison of ultrasonic and pulsed NMR techniques for determination of solid fat content

2002 ◽  
Vol 79 (5) ◽  
pp. 431-437 ◽  
Author(s):  
Anand Pal Singh ◽  
D. J. McClements ◽  
A. G. Marangoni
Keyword(s):  
Solid Fat Content ◽  
Fat Content ◽  
Solid Fat ◽  
Nmr Techniques ◽  
Pulsed Nmr

EVALUATION OF SEVERAL PULSED NMR TECHNIQUES FOR SOLIDS-IN-FAT DETERMINATION OF COMMERCIAL FATS

1977 ◽  
Vol 42 (2) ◽  
pp. 432-435 ◽  
Author(s):  
G. J. TEMPLEMAN ◽  
J. J. SHOLL ◽  
T.P. LABUZA
Keyword(s):  
Nmr Techniques ◽  
Pulsed Nmr

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.

scholarly journals Synthesis and Spectroscopic Determination of the Coordination Differences of Cadmium and Zinc Complexes of Dehydroacetic Acid with Pyridine and g-Picoline

2018 ◽  
pp. 81-89
Author(s):  
Erika Martins de Carvalho ◽  
Roselene Ribeiro Riente ◽  
José Daniel Figueroa Villar
Keyword(s):  
Experimental Data ◽  
Molecular Modeling ◽  
Pulse Sequence ◽  
Semiempirical Method ◽  
Octahedral Geometry ◽  
Intermolecular Distance ◽  
Distance Measurements ◽  
Dehydroacetic Acid ◽  
Nmr Techniques

Various complexes of DHA with transition-metal cations are known for their antifungal properties. Here, four novel Zn and Cd complexes were prepared via the substitution of water by pyridine andg-picoline using Zn(DHA)2(H2O)2 (2) and Cd(DHA)2(H2O)2 (3) as starting materials. The products were characterized by IR, UV, elemental analysis, TGA and NMR techniques, including correlation times and intermolecular distance measurements using the NULL pulse sequence. The experimental data were compared to the molecular modeling results using DFT and the semiempirical method PM3, confirming that the pentacoordinated Zn complexes have bipyramidal geometry while the Cd complexes have the expected octahedral geometry. These results show that substitution of Zn by Cd leads to an important modification of the coordination structure, especially when strong ligands are involved.

Sign in / Sign up

Export Citation Format

Share Document