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Secondary isotope effect on the ^19^F shielding in xenon and krypton difluorides in solution by Jukka P. Jokisaari; L. Petri Ingman; Gary J. Schrobilgen; Jeremy C. P. Sanders is a Chemistry article available to read on EtoBox.

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## Abstract The effects of the various xenon and krypton isotopes on the nuclear shielding of ^19^F in xenon and krypton difluoride in solution were studied by ^19^F NMR spectroscopy. For both molecules, linear relationships were observed between the one‐bond secondary isotope shift of the ^19^F nucleus, ^1^Δ; ^19^F(^__m__′/128^Xe) and ^1^Δ ^19^F(^__m__′/78^Kr), and the relative mass factor, (__m__′ − __m__)/__m__′, and also between the shifts and the quadratic mean bond displacement, 〈(Δ__r__)^2^〉. On the basis of the latter correlation and the linear relationship between 〈Δ__r__〉 and 〈(Δ__r__)^2^〉 for the linear combination of the first and second derivatives of the ^19^F shielding, the values −1742 and −5804 ppm Å^−2^, respectively, were determined. Further, the temperature dependence of the ^129^Xe and ^19^F chemical shifts and the ^129^Xe, ^19^F indirect spin‐spin coupling of XeF~2~ were determined. The ^129^Xe chemical shift is extremely sensitive to temperature with Δδ/Δ__T__ = −0.4718 ppm K^−1^, whereas for ^19^F Δδ/Δ__T__ = +0.0042 ppm K^−1^. In contrast, the ^129^Xe, ^19^F indirect spin–spin coupling is independent of temperature over the range 243–303 K, the mean value b

Who reads Secondary isotope effect on the ^19^F shielding in xenon and krypton difluorides in solution?

Author

Jukka P. Jokisaari; L. Petri Ingman; Gary J. Schrobilgen; Jeremy C. P. Sanders

Publisher

John Wiley and Sons; Wiley (John Wiley & Sons); John Wiley & Sons Inc.; John Wiley and Sons Ltd; Wiley (ISSN 0749-1581)

Published

1994

Language

EN

Field

Chemistry (Physical Sciences)