Charge Distribution and Structures of Halogenogallates and Halogenoaluminates of the Type MeIMeIIIX4, MeIMe2 IIIX7, and C6H6 CUAlCl4. An NQR Investigation ( 35Cl, 79Br, 127I, 63Cu, 69Ga)

Abstract

Abstract In polycrystalline samples of the halogenoaluminates MeIAlCl4 (MeI - Cu, Ag), CuAlBr4, C6H6 · CUAlCl4 and halogenogallates CuGaCl4, MeIGaBr4 (MeI = Cu, Na, K, NH4, Rb, Cs, Ga), MeIGaI4 (MeI = Cu, Cs), MeIGa2Br7 (MeI = K, NH4, Rb, Cs), CsGa2I7, the halogen, MeIII , and Cu-NQR spectra were studied, partly as a function of temperature. Phase transformations are found in NH4GaBr4, CsGaBr4, and RbGa2Br7. The spectroscopic results are discussed and a charge distribution analysis is given, based on the Townes-Dailey theory. Symmetry properties of the solids are pointed out in connection with multiplicity and intensity ratios of the NQR spectra.