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Tetramethylarsonium-metaperiodate shows  127 I solid state NMR signals without any visible quadrupole splitting. Due to the very large nuclear quadrupole moments of the rhenium isotopes  185,187 Re, the analogous Re compound exhibits the expected second order quadrupole NMR effects. The measured  185,187 ReRe NMR powder spectra contain superimposed signals arising from two different types of ReO -  4  tetrahedra, indicating that part of the ReO 4  -  anions deviate only slightly from tetrahedral symmetry, while the other part are nearly undistorted ReO 4  -  anions.

127 I, 185 Re and 187 Re Solid State NMR Measurements on (CH 3 ) 4 AsIO 4 and (CH 3 ) 4 AsReO 4