Electrochemical Synthesis and Structural Characterization of the One-Dimensional Chain Compound (Et4N)2[As2Te5] and the Tellurido Arsenate (Me4N)4[As4Te6]·2en

Christopher J. Warren, Robert C. Haushalter, Andrew Bruce Bocarsly

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Abstract

The new arsenic telluride (Et4N)2[As2Te5] (1) has been prepared by electrolytically dissolving As2Te3 cathodes into an ethylenediamine solution of Et4NI. Telluride 1 crystallizes in the triclinic space group P1 with lattice constants a = 9.296(2), b = 11.341(4), c = 7.829(2) Å, α = 104.31(2)°, β = 98.60(2)°, γ = 112.54(2)°, V = 710.6(4) Å3, Z = 1, and R(Rw) = 0.064(0.058). The structure consists of infinite one-dimensional As2Te52− chains running parallel to the c axis which are surrounded by Et4N+ cations. The structure of the unique As2Te52- chain is built up from alternating As24+ dimers (As-As = 2.451(8) Å) and square planar Te56- fragments with As-Te contacts of 2.587(5) and 2.598(4) Å. The Te56- moieties contain a central square-planar tellurium atom bonded to the neighboring four Te atoms at 3.058(4) Å (2X) and 3.009(3) Å (2X). Changing the supporting electrolyte to Me4NI allows (Me4N)4[As4Te6]·2en (2) to be isolated. Telluride 2 crystallizes in the monoclinic space group P21/n with a = 11.905(3), b = 10.347(4), c = 19.017(5) Å, β = 100.92(2)°, V = 2300(1) Å3, Z = 2 and R (Rw) = 0.062 (0.063). Like 1, telluride 2 contains As24+ dimers bonded to four tellurium atoms but forms an As4Te2 six-membered ring with an exocyclic terminal Te atom on each arsenic.

Original languageEnglish (US)
Pages (from-to)780-783
Number of pages4
JournalChemistry of Materials
Volume6
Issue number6
DOIs
StatePublished - Jun 1 1994

All Science Journal Classification (ASJC) codes

  • Chemistry(all)
  • Chemical Engineering(all)
  • Materials Chemistry

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