DOI: 10.1063/1.1669822. Magnetic Nonequivalence in the High-Resolution NMR Spectra of Diborane

Magnetic Nonequivalence in the High-Resolution NMR Spectra of Diborane

10.1063/1.1669822

Crossref journal-article

AIP Publishing

The Journal of Chemical Physics (317)

Abstract

Proton and boron-11 nuclear magnetic resonance spectra of 11B-enriched neat diborane have been measured over the temperature range from −7° to −60°C. The terminal-proton resonance and the 11B spectrum exhibit partially resolved fine structure which arises from the magnetic nonequivalence of the terminal protons and of the boron nuclei due to long-range spin coupling. Spectra were calculated which agree quite well with the observed spectra and result in a reasonably accurate determination of the magnitudes and most of the relative signs of the various coupling constants. These values are: JBB = ∓5 Hz, JBHb = +46.2 Hz, JBHt = +133 Hz, J′BHt = +4 Hz, | JHtHb | = 7.2 Hz, JHtHb (trans or cis) = ±14 Hz, JHtHt (cis or trans) = ±6 Hz, | JHtHtgem | &lt; 3 Hz, δ(Ht − Hb) = −4.50 ppm.

Bibliography

Farrar, T. C., Johannesen, R. B., & Coyle, T. D. (1968). Magnetic Nonequivalence in the High-Resolution NMR Spectra of Diborane. The Journal of Chemical Physics, 49(1), 281â285.

Authors 3

T. C. Farrar (first)
R. B. Johannesen (additional)
T. D. Coyle (additional)

References 13 Referenced 19

10.1063/1.1739944 / J. Chem. Phys. (1954)
10.1039/df9551900215 / Discussions Faraday Soc. (1955)
10.1021/j100803a516 / J. Phys. Chem. (1963)
10.1111/j.1749-6632.1966.tb49761.x / Ann. N.Y. Acad. Sci. (1966)
{'key': '2024020903472486600_r5'}
10.1063/1.1725826 / J. Chem. Phys. (1964)
10.1080/00268975800100411 / Mol. Phys. (1958)
10.1063/1.1742204 / J. Chem. Phys. (1955)
{'key': '2024020903472486600_r9'}
{'key': '2024020903472486600_r10', 'first-page': '385', 'volume': 'A269', 'year': '1962', 'journal-title': 'Proc. Roy. Soc. (London)'} / Proc. Roy. Soc. (London) (1962)
10.1039/tf9615700888 / Trans. Faraday Soc. (1961)
10.1063/1.1726849 / J. Chem. Phys. (1966)
10.1080/00268976300100701 / Mol. Phys. (1963)

Dates

Type	When
Created	21 years, 6 months ago (Feb. 6, 2004, 2:22 p.m.)
Deposited	1 year, 6 months ago (Feb. 8, 2024, 10:50 p.m.)
Indexed	1 year, 6 months ago (Feb. 8, 2024, 11:40 p.m.)
Issued	57 years, 2 months ago (July 1, 1968)
Published	57 years, 2 months ago (July 1, 1968)
Published Print	57 years, 2 months ago (July 1, 1968)

Funders 0

None

BibTeX

@article{Farrar_1968, title={Magnetic Nonequivalence in the High-Resolution NMR Spectra of Diborane}, volume={49}, ISSN={1089-7690}, url={http://dx.doi.org/10.1063/1.1669822}, DOI={10.1063/1.1669822}, number={1}, journal={The Journal of Chemical Physics}, publisher={AIP Publishing}, author={Farrar, T. C. and Johannesen, R. B. and Coyle, T. D.}, year={1968}, month=jul, pages={281–285} }

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  "abstract": "<jats:p>Proton and boron-11 nuclear magnetic resonance spectra of 11B-enriched neat diborane have been measured over the temperature range from \u22127\u00b0 to \u221260\u00b0C. The terminal-proton resonance and the 11B spectrum exhibit partially resolved fine structure which arises from the magnetic nonequivalence of the terminal protons and of the boron nuclei due to long-range spin coupling. Spectra were calculated which agree quite well with the observed spectra and result in a reasonably accurate determination of the magnitudes and most of the relative signs of the various coupling constants. These values are: JBB\u2009=\u2009\u22135 Hz, JBHb\u2009=\u2009+46.2 Hz, JBHt\u2009=\u2009+133 Hz, J\u2032BHt\u2009=\u2009+4 Hz, |\u2009JHtHb\u2009|\u2009=\u20097.2 Hz, JHtHb (trans or cis)\u2009=\u2009\u00b114 Hz, JHtHt (cis or trans)\u2009=\u2009\u00b16 Hz, |\u2009JHtHtgem\u2009|\u2009&amp;lt;\u20093 Hz, \u03b4(Ht\u2009\u2212\u2009Hb)\u2009=\u2009\u22124.50 ppm.</jats:p>",
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