Abstract
Two new quaternary salts, [Hg 3Te 2][UCl 6] and [Hg 4As 2][UCl 6], have been synthesized and their structures determined by single-crystal X-ray diffraction analysis. [Hg 3Te 2][UCl 6] is the product of a reaction involving UCl 4, HgCl 2, and HgTe at 873 K. The compound crystallizes in space group P2 1/ c of the monoclinic system. [Hg 4As 2][UCl 6] results from the reaction of U, Hg 2Cl 2, and As at 788 K. It crystallizes in space group Pbca of the orthorhombic system. [Hg 3Te 2][UCl 6] has a two-dimensional framework of ∞ 2 [ Hg 3 Te 2 2 + ] layers, whereas [Hg 4As 2][UCl 6] has a three-dimensional framework of ∞ 2 [ Hg 3 As 2 ] layers interconnected by Hg atoms linearly bonded to As atoms. Both framework structures contain discrete [UCl 6] 2− anions between the layers. [Hg 3Te 2][UCl 6] exhibits temperature-independent paramagnetism. The optical absorption spectra of these compounds display f– f transitions.
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