Abstract
Abstract Wide-line NMR studies of ammonia molecules in Hofmann-type clathrates with the general formula of M(NH3)2M′(CN)4·2C6D6 are reported. In the Hofmann-type clathrates, two ammonia molecules coordinate to the paramagnetic metal ions in trans 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.
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