Order–disorder phenomena in crystalline phases of compounds E(XMe₃)₄ where E = C, Si, Ge and X = Si, Sn

Abstract

We discuss the dynamic solid-state properties of crystalline phases E(XMe 3 ) 4 as seen by solid-state NMR and powder X-ray diffraction. In the first part we will qualitatively describe some of the NMR tools suitable for such investigations. In the second part we will give examples from the group of solid compounds E(XMe 3 ) 4 with E = C, Si, Ge and X = Si, Sn.

Silver ion dynamics in the Ag5Te2Cl-polymorphs revealed by solid state NMR lineshape and two- and three-time correlation spectroscopies

“…Within this temperature region, a sizeable fraction of the 109 Ag nuclei change their Larmor frequencies during the rotor cycle. As discussed previously in the literature, [32][33][34] this process inter-feres with the ability of magic-angle spinning to provide line narrowing, resulting in an excessive broadening and loss of the signal. Below 230 K, the signal re-appears, and a single broad resonance near 1075 ppm is measured.…”