Proton magnetic resonance study of metal-ammonia compounds

R. F. Marzke; W. S. Glaunsinger

doi:10.1021/j100593a037

Proton magnetic resonance study of metal-ammonia compounds

R. F. Marzke, W. S. Glaunsinger

Physics

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8 Scopus citations

Abstract

The proton magnetic resonance (¹H NMR) spectra of Ca(NH₃)₆, Ba(NH₃)₆, and Li(NH₃)₄ have been recorded in the temperature range 20-150 K using a broad-line, symmetrical-bridge spectrometer. In the hexaammines very narrow first-derivative line widths are observed (<2.5 G in the range 20-150 K). Significant changes occur in the ¹H NMR spectra of Ca(NH₃)₆ in the ranges 20-50, 60-80, and 100-130 K, whereas in Ba(NH₃)₆ changes occur between 70 and 100 K and above 140 K. The line width and its temperature dependence are interpreted in terms of structure, phase transitions, and molecular motion. In the high-temperature region very large, temperature-independent, high-field shifts of about 0.3 G (160 ppm) have been measured in both Ca(NH₃)₆ and Ba(NH₃)₆. The shifts are tentatively interpreted in terms of indirect coupling of the type found in aromatic radicals.

Original language	English (US)
Pages (from-to)	2976-2983
Number of pages	8
Journal	The Journal of Physical Chemistry
Volume	79
Issue number	26
DOIs	https://doi.org/10.1021/j100593a037
State	Published - Jan 1 1975

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Engineering(all)
Physical and Theoretical Chemistry

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title = "Proton magnetic resonance study of metal-ammonia compounds",

abstract = "The proton magnetic resonance (1H NMR) spectra of Ca(NH3)6, Ba(NH3)6, and Li(NH3)4 have been recorded in the temperature range 20-150 K using a broad-line, symmetrical-bridge spectrometer. In the hexaammines very narrow first-derivative line widths are observed (<2.5 G in the range 20-150 K). Significant changes occur in the 1H NMR spectra of Ca(NH3)6 in the ranges 20-50, 60-80, and 100-130 K, whereas in Ba(NH3)6 changes occur between 70 and 100 K and above 140 K. The line width and its temperature dependence are interpreted in terms of structure, phase transitions, and molecular motion. In the high-temperature region very large, temperature-independent, high-field shifts of about 0.3 G (160 ppm) have been measured in both Ca(NH3)6 and Ba(NH3)6. The shifts are tentatively interpreted in terms of indirect coupling of the type found in aromatic radicals.",

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AU - Marzke, R. F.

AU - Glaunsinger, W. S.

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N2 - The proton magnetic resonance (1H NMR) spectra of Ca(NH3)6, Ba(NH3)6, and Li(NH3)4 have been recorded in the temperature range 20-150 K using a broad-line, symmetrical-bridge spectrometer. In the hexaammines very narrow first-derivative line widths are observed (<2.5 G in the range 20-150 K). Significant changes occur in the 1H NMR spectra of Ca(NH3)6 in the ranges 20-50, 60-80, and 100-130 K, whereas in Ba(NH3)6 changes occur between 70 and 100 K and above 140 K. The line width and its temperature dependence are interpreted in terms of structure, phase transitions, and molecular motion. In the high-temperature region very large, temperature-independent, high-field shifts of about 0.3 G (160 ppm) have been measured in both Ca(NH3)6 and Ba(NH3)6. The shifts are tentatively interpreted in terms of indirect coupling of the type found in aromatic radicals.

AB - The proton magnetic resonance (1H NMR) spectra of Ca(NH3)6, Ba(NH3)6, and Li(NH3)4 have been recorded in the temperature range 20-150 K using a broad-line, symmetrical-bridge spectrometer. In the hexaammines very narrow first-derivative line widths are observed (<2.5 G in the range 20-150 K). Significant changes occur in the 1H NMR spectra of Ca(NH3)6 in the ranges 20-50, 60-80, and 100-130 K, whereas in Ba(NH3)6 changes occur between 70 and 100 K and above 140 K. The line width and its temperature dependence are interpreted in terms of structure, phase transitions, and molecular motion. In the high-temperature region very large, temperature-independent, high-field shifts of about 0.3 G (160 ppm) have been measured in both Ca(NH3)6 and Ba(NH3)6. The shifts are tentatively interpreted in terms of indirect coupling of the type found in aromatic radicals.

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Proton magnetic resonance study of metal-ammonia compounds

Abstract

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