Results 221 to 230 of about 222,547 (261)
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2022
This chapter details the features of nuclear magnetic resonance (NMR) spectra. It starts with the chemical shift of a nucleus carrying the difference between its resonance frequency and that of a reference standard. The resonance frequency of a magnetic nucleus is affected by its electronic environment and the presence of nearby magnetic nuclei.
Peter Atkins +2 more
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This chapter details the features of nuclear magnetic resonance (NMR) spectra. It starts with the chemical shift of a nucleus carrying the difference between its resonance frequency and that of a reference standard. The resonance frequency of a magnetic nucleus is affected by its electronic environment and the presence of nearby magnetic nuclei.
Peter Atkins +2 more
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ChemInform, 2007
AbstractChemInform is a weekly Abstracting Service, delivering concise information at a glance that was extracted from about 200 leading journals. To access a ChemInform Abstract, please click on HTML or PDF.
Erkki Kolehmainen +2 more
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AbstractChemInform is a weekly Abstracting Service, delivering concise information at a glance that was extracted from about 200 leading journals. To access a ChemInform Abstract, please click on HTML or PDF.
Erkki Kolehmainen +2 more
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The Journal of Chemical Physics, 1961
The NMR spectra of glycidaldehyde were measured at 40 and 60 Mc/sec. [Complex chemical formula] These complicated spectra of four interacting protons were analyzed by two methods: the ABKY approximation and the iterated ABCD solution. The various mathematical techniques developed should prove useful in the analyses of other complicated spin resonance ...
C. A. Reilly, J. D. Swalen
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The NMR spectra of glycidaldehyde were measured at 40 and 60 Mc/sec. [Complex chemical formula] These complicated spectra of four interacting protons were analyzed by two methods: the ABKY approximation and the iterated ABCD solution. The various mathematical techniques developed should prove useful in the analyses of other complicated spin resonance ...
C. A. Reilly, J. D. Swalen
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NMR spectra of halopermethylpolysilanes
Journal of Organometallic Chemistry, 1974Abstract Proton NMR spectra were determined for the series X(SiMe2)nX (n = 3, 4, 6 and X F, Cl, I) and Me(SiMe2)6X. Fluorine-19 NMR spectrafor the fluorosilanes of these series were also determined. The chemical shift of the methyl protons of the SiMe2X group appears at higher field as the chain length increases.
W.G. Boberski, A.L. Allred
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Exact Classification of NMR Spectra from NMR Signals
ICASSP 2024 - 2024 IEEE International Conference on Acoustics, Speech and Signal Processing (ICASSP)Nuclear magnetic resonance (NMR) spectroscopy is routinely used to study the properties of matter. Therefore, different materials can be classified according to their NMR spectra. However, the NMR spectra cannot be observed directly, and only the NMR signal, which is a sum of complex exponentials, is directly observable in practice.
Pedro Izquierdo Lehmann +3 more
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On the NMR spectra of pentafluorobenzenes
Journal of Magnetic Resonance (1969), 1969Abstract The AA′BB′C NMR spin systems of the pentafluorobenzene derivatives with the substituents -Cl, -Br, -I, -OH, ⊖-0, -NH 2 , -NH 3 and -CN have been carefully recorded and analyzed completely using in every case iterative fitting to the experimental transitions.
Edward A Cohen +2 more
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ChemInform, 2005
AbstractFor Abstract see ChemInform Abstract in Full Text.
Ludger Ernst, Kerstin Ibrom
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AbstractFor Abstract see ChemInform Abstract in Full Text.
Ludger Ernst, Kerstin Ibrom
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Bulletin of the Academy of Sciences of the USSR Division of Chemical Science, 1979
1. An assignment was made of the lines in the13C and1H NMR spectra of the diterpene alcohol lagochilin. 2. The spectral parameters were compared with the characteristic structural traits of lagochilin, which can be used to establish the structure, configuration, and conformation of diterpenes of the labdane series.
O. S. Chizhov +2 more
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1. An assignment was made of the lines in the13C and1H NMR spectra of the diterpene alcohol lagochilin. 2. The spectral parameters were compared with the characteristic structural traits of lagochilin, which can be used to establish the structure, configuration, and conformation of diterpenes of the labdane series.
O. S. Chizhov +2 more
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Chemistry of Natural Compounds, 1972
The NMR spectra of 12 coumestans in trifluoroacetic acid have been studied. The same features of the chemical shifts of the ring protons are found in the spectra of the coumestans as in the spectra of the coumarins.
L. L. Simonova +3 more
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The NMR spectra of 12 coumestans in trifluoroacetic acid have been studied. The same features of the chemical shifts of the ring protons are found in the spectra of the coumestans as in the spectra of the coumarins.
L. L. Simonova +3 more
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1974
The definition and uses of band width and band shape were introduced in Chapter 1, Section IIE, and were illustrated briefly. However, full use of these two characteristics requires a much more extensive acquaintance with actual spectra. It is necessary to have a mental picture of the appearance of the various kinds of multiplets under different ratios
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The definition and uses of band width and band shape were introduced in Chapter 1, Section IIE, and were illustrated briefly. However, full use of these two characteristics requires a much more extensive acquaintance with actual spectra. It is necessary to have a mental picture of the appearance of the various kinds of multiplets under different ratios
openaire +1 more source