Syntheses, structures, and magnetic and optical properties of the compounds [Hg 3Te 2][UCl 6] and [Hg 4As 2][UCl 6]

• Published in: Journal of solid state chemistry Vol. 181; no. 12; pp. 3189 - 3193
• Main Authors: Bugaris, Daniel E., Ibers, James A.
• Format: Journal Article
• Language: English
• Published: Amsterdam Elsevier Inc 01.12.2008; Elsevier
• Subjects: [UCl 6] 2; ABSORPTION SPECTRA; ANIONS; Antiferromagnetics; Condensed matter: electronic structure, electrical, magnetic, and optical properties; Condensed matter: structure, mechanical and thermal properties; Crystal structures; Exact sciences and technology; Inorganic compounds; INORGANIC, ORGANIC, PHYSICAL AND ANALYTICAL CHEMISTRY; LAYERS; Magnetic properties and materials; MERCURY CHLORIDES; MERCURY TELLURIDES; MONOCLINIC LATTICES; MONOCRYSTALS; OPTICAL PROPERTIES; Optical properties and condensed-matter spectroscopy and other interactions of matter with particles and radiation; ORTHORHOMBIC LATTICES; Other nonmetals; PARAMAGNETISM; Physics; SPACE GROUPS; Structure of solids and liquids; crystallography; Structure of specific crystalline solids; Studies of specific magnetic materials; Syntheses; SYNTHESIS; TEMPERATURE RANGE 0400-1000 K; URANIUM CHLORIDES; URANIUM COMPOUNDS; Uranium mercury chalcogenide; Uranium mercury pnictide; Visible and ultraviolet spectra; X-RAY DIFFRACTION; Crystal structures; Uranium mercury pnictide; Uranium mercury chalcogenide; [UCl 6] 2; Syntheses; Space groups; Reaction product; Paramagnetism; Optical transition; Mercury chloride; Monoclinic lattices; [UCl6]2; Chalcogenides; Pnictides; Uranium; Optical properties; Orthorhombic lattices; Magnetic structure; Mercury tellurides; Absorption spectra; Mercury; Optical absorption; X-ray diffraction analysis; Magnetic properties; Crystal structure
• ISSN: 0022-4596; 1095-726X
• DOI: 10.1016/j.jssc.2008.08.019

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. Views of the structures of [Hg 3Te 2][UCl 6] and [Hg 4As 2][UCl 6].