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Title: Synthesis and structure of K{sub 10}Tl{sub 7}: The first binary trielide containing naked pentagonal bipyramidal Tl{sub 7} clusters

The title compound is synthesized by direct fusion of the elements at 400 C followed by annealing at 330 C, quenching to room temperature, and subsequent annealing at 120 and 100 C for days to weeks. The compound crystallizes in the monoclinic space group P2{sub 1}/c (No. 14), with Z = 4, a = 10.132(1){angstrom}, b = 22.323(2){angstrom}, c = 13.376(1){angstrom}, and {beta} = 93.14(1){degree}, and consists of Tl{sub 7}{sup 7{minus}} clusters embedded in a matrix of potassium ions. The cluster is an axially compressed pentagonal bipyramid close to D{sub 5h} symmetry. The apex-apex bond distance (3.462(1){angstrom}) is little longer than the bonds in the pentagonal waist (3.183(1)--3.247(1){angstrom}). Structurally the compound is not electron-precise: K{sub 10}Tl{sub 7} has three extra electrons per Tl{sub 7} cluster and is Pauli paramagnetic ({chi}{sub 300} = 2.25 x 10{sup {minus}4} emu/mol).
Authors:
;
Publication Date:
OSTI Identifier:
20017571
DOE Contract Number:
W-7405-ENG-82
Resource Type:
Journal Article
Resource Relation:
Journal Name: Inorganic Chemistry; Journal Volume: 39; Journal Issue: 4; Other Information: PBD: 21 Feb 2000
Research Org:
Iowa State Univ., Ames, IA (US)
Sponsoring Org:
US Department of Energy
Country of Publication:
United States
Language:
English
Subject:
37 INORGANIC, ORGANIC, PHYSICAL AND ANALYTICAL CHEMISTRY; 36 MATERIALS SCIENCE; POTASSIUM COMPOUNDS; THALLIUM COMPOUNDS; SYNTHESIS; CRYSTAL STRUCTURE; SYMMETRY