Charge Distribution and Structures of Halogenogallates and Halogenoaluminates of the Type MeIMeIIIX4, MeIMe2IIIX7, and C6H6 CUAlCl4. An NQR Investigation (35Cl, 79Br, 127I, 63Cu, 69Ga)
2014
Fichtner, Winfried | Weiss, Alarich
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.
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