The crystal structures of the isomorphous garnethyphen;red copper salts, KCuCl3and NH4CuCl3, have been determined. Each compound contains discrete, planar, Cu2Cl6=dimers. These dimers are stacked above each other along the crystallographicaaxis. The cation exhibits a ninefold coordination.KCuCl3is antiferromagnetic below 30deg;K. Both KCuCl3and NH4CuCl3are pleochroic with maximum visible absorption when the electric vector is parallel with the Cusngbnd;Cu vector of the dimer.
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