The Metal Ammine Cyanide Aromatics Clathrates. XVI. Wide-Line NMR Studies of the Three-Spin Systems of Ligand Ammonia in Paramagnetic Hofmann-type Clathrates

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概要

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• Wide-line NMR studies of ammonia molecules in Hofmann-type clathrates with the general formula of M(NH<SUB>3</SUB>)<SUB>2</SUB>M′(CN)<SUB>4</SUB>·2C<SUB>6</SUB>D<SUB>6</SUB> are reported. In the Hofmann-type clathrates, two ammonia molecules coordinate to the paramagnetic metal ions in <I>trans</I> positions and have only a slight interaction with each other. In powder samples, the proton NMR spectra of ammonia give fine structures with three components, which are caused by dipolar interaction between protons of the rotating triangular three-spin system. The signals shift to the higher-field side under the influence of the paramagnetic moments of the metal ions. The temperature dependence of the shifts and line shapes, where M is iron(II), cobalt(II), nickel(II), and copper(II), will be reported on. No rigid ammonia was found, even at the temperature of liquid nitrogen.

• 公益社団法人 日本化学会の論文

著者

• Nakano Taku

  Department of Chemistry, Faculty of Science, The University of Tokyo

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• The Metal Ammine Cyanide Aromatics Clathrates. XVI. Wide-Line NMR Studies of the Three-Spin Systems of Ligand Ammonia in Paramagnetic Hofmann-type Clathrates
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