Hydrothermal Synthesis and Characterization of (Me4N)[HgAsSe3], (Et4N)[HgAsSe3], and (Ph4P)2[Hg2As4Se11]:Novel 1-D Mercury Selenoarsenates
1996; Elsevier BV; Volume: 123; Issue: 1 Linguagem: Inglês
10.1006/jssc.1996.0159
ISSN1095-726X
AutoresJun-Hong Chou, Mercouri G. Kanatzidis,
Tópico(s)Chalcogenide Semiconductor Thin Films
ResumoThree new mercury thioarsenates, (Me4N)[HgAsSe3], (Et4N)[HgAsSe3], and (Ph4P)2[Hg2As4Se11], with one-dimensional structures were synthesized hydrothermally from mixtures of HgCl2/3K3AsSe3/4(Me4NCl, Et4NBr, Ph4PBr), respectively, in sealed Pyrex tubes. The structures were determined by single-crystal X-ray diffraction analysis. (Me4N)[HgAsSe3] and (Et4N)[HgAsSe3] both crystallize in the monoclinic space groupP21/n(No. 14) witha= 7.115(1) Å,b= 17.464(5) Å,c= 9.356(2) Å, β = 91.34(1)o,Z= 4,V= 1162.2(7) Å3for the former anda= 7.175(2) Å,b= 18.907(4) Å,c= 10.897(3) Å, β = 99.56(2)o,Z= 4,V= 1457(1) Å3for the latter. They have the same one-dimensional chain-like anionic framework with trigonal planar Hg2+and [AsSe3]3−units. (Ph4P)2[Hg2As4Se11] crystallizes in the triclinic space groupP-1 (No. 2) witha= 10.329(2) Å,b= 17.017(3) Å,c= 17.485(3) Å, α = 92.70(1)o, β = 105.73(1)o, γ = 103.71(1)o,Z= 2,V= 2853(1) Å3. [Hg2As4Se112n−nalso possess a one-dimensional chain-like structure consisting of both trigonal-planar and tetrahedral Hg2+ions. It contains a unique [As4Se11]6−ligand which binds to four Hg2+ions. The optical absorption and thermal properties of these compounds are reported.
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