Resolution Nuclear Magnetic Resonance Spectra Research Articles

High Resolution Nuclear Magnetic Resonance Spectra of Ring Protons in Substituted Benzenes

Abstract High resolution proton magnetic resonance spectra of a variety of mono- and di-substituted benzenes were observed at 56.4 Mc. The spectra of molecules with higher symmetry were analyzed, and the values of chemical shifts among the ring protons and those referred to benzene were obtained as well as spin coupling constants. The spectra were discussed with correlation to the substituents.

Nuclear magnetic resonance spectra of some fluorine‐containing polymers

AbstractHigh resolution nuclear magnetic resonance spectra have been measured for the F19 resonance in some fluorine‐containing polymers. These data have shown that the F19 resonance frequency depends on the electronegativity of the other substituents on the carbon atom, in a manner similar to that found for small molecules. The resonance frequency also is dependent on substituents attached to adjacent carbons in a way not easily explained by inductive effects. It is hypothesized that these latter shifts may be due to direct potential interaction. The above generalizations, together with other supporting evidence, were utilized to assign a small peak in the spectrum of polyvinylidene fluoride to a head‐to‐head structure. This structure is present to the extent of 8–10%.

High Resolution Proton Magnetic Resonance Spectrum of Mercury Diethyl: Analysis of an A3B2 System

High Resolution Proton Magnetic Resonance Spectrum of Mercury Diethyl: Analysis of an A₃B₂ System

Plant Polyphenols. VIII. The Structure of Ellagorubin. Part A. Infrared Spectra. Part B. High Resolution Nuclear Magnetic Resonance Spectra

ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTPlant Polyphenols. VIII. The Structure of Ellagorubin. Part A. Infrared Spectra. Part B. High Resolution Nuclear Magnetic Resonance SpectraFred Stitt, Edith Gong, K. J. Palmer, and J. N. ShooleryCite this: J. Am. Chem. Soc. 1959, 81, 17, 4615–4620Publication Date (Print):September 1, 1959Publication History Published online1 May 2002Published inissue 1 September 1959https://doi.org/10.1021/ja01526a041RIGHTS & PERMISSIONSArticle Views69Altmetric-Citations2LEARN ABOUT THESE METRICSArticle Views are the COUNTER-compliant sum of full text article downloads since November 2008 (both PDF and HTML) across all institutions and individuals. These metrics are regularly updated to reflect usage leading up to the last few days.Citations are the number of other articles citing this article, calculated by Crossref and updated daily. Find more information about Crossref citation counts.The Altmetric Attention Score is a quantitative measure of the attention that a research article has received online. Clicking on the donut icon will load a page at altmetric.com with additional details about the score and the social media presence for the given article. Find more information on the Altmetric Attention Score and how the score is calculated. Share Add toView InAdd Full Text with ReferenceAdd Description ExportRISCitationCitation and abstractCitation and referencesMore Options Share onFacebookTwitterWechatLinked InReddit PDF (617 KB) Get e-Alerts Get e-Alerts

ON THE COUPLING BETWEEN F19 AND H1 NUCLEI IN p-FLUOROTOLUENE

The proton and fluorine high resolution nuclear magnetic resonance spectra of p-fluorotoluene are discussed in terms of the case A2A2′X. The 4 × 4 submatrices are diagonalized in analytical form and therefore explicit values for all energy levels can be obtained. The spectra are consistent with [Formula: see text] which may be of theoretical interest.

An Abnormal Saturation Behavior in High Resolution Proton Magnetic Resonance Spectra

An Abnormal Saturation Behavior in High Resolution Proton Magnetic Resonance Spectra

Nuclear spin-spin coupling between fluorine and hydrogen in fluorobenzene

High resolution proton and fluorine nuclear magnetic resonance (nmr) spectra of fluorobenzene, 4D-, 2,4,6-D 3−, and 2,3,5,6-D 4-fluorobenzene have been obtained and analyzed. Double irradiation techniques were employed to eliminate the effects of the deuterium nuclear spin. The secular equation for 4D-fluorobenzene has been solved and the parameters adjusted for the best correspondence between the predicted and observed spectra. The nuclear spin couplings between the fluorine nucleus and the ortho, meta, and para protons are found to be, respectively, 9.4 ± 0.2 cps, 5.8 ± 0.2 cps, and 0.0 ± 0.5 cps. These couplings are found to have the same sign as the proton-proton couplings in the fluorobenzene molecule. This result is discussed and related to previous work on fluorobenzenes.

The relation of high resolution nuclear magnetic resonance spectra to molecular structures

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Nuclear Magnetic Resonance Spectra and Structure of Borohydride Ion and Diborane

High resolution proton magnetic resonance spectra are presented for aqueous NaBH4 and liquid B2H6 at 30 and 40 megacycles. B11 magnetic resonance spectra at 6 megacycles are presented for these same substances. The details of the spectra constitute powerful confirmation of a tetrahedral model for BH4— and a bridge proton model for B2H6. The bridge protons in the latter display resonance at higher applied magnetic field than do the terminal protons, suggesting a more hydride-ion like character for the former. Quantitative spin-spin multiplet separations and chemical shifts are recorded.