Controlling Lewis basicity in polythioarsenate fluxes: stabilization of KSnAsS(5) and K(2)SnAs(2)S(6). Extended chains and slabs based on pyramidal beta-[AsS(4)](3-) and [AsS(3)](3-) units

Ratnasabapathy G Iyer; Mercouri G Kanatzidis

doi:10.1021/ic025523h

Controlling Lewis basicity in polythioarsenate fluxes: stabilization of KSnAsS(5) and K(2)SnAs(2)S(6). Extended chains and slabs based on pyramidal beta-[AsS(4)](3-) and [AsS(3)](3-) units

Inorg Chem. 2002 Jul 15;41(14):3605-7. doi: 10.1021/ic025523h.

Authors

Ratnasabapathy G Iyer¹, Mercouri G Kanatzidis

Affiliation

¹ Department of Chemistry and Center for Fundamental Materials Research, Michigan State University, East Lansing, Michigan 48824, USA.

PMID: 12099862
DOI: 10.1021/ic025523h

Abstract

Two low-dimensional compounds, KSnAsS(5) and K(2)SnAs(2)S(6), were prepared using liquid polythioarsenate salts, and the results differ from those obtained with the well studied thiophosphate flux. KSnAsS(5) crystallizes in the orthorhombic space group Pbam with cell parameters of a = 8.136(2) A, b = 13.784(4) A, c = 7.428(2) A. KSnAsS(5) features the unusual pyramidal species [AsS(2)(S(2))](3-). K(2)SnAs(2)S(6) crystallizes in the trigonal space group P3 macro with cell parameters a = 6.717(5) A, b = 7.204(8) A, gamma = 120 degrees. The compounds were obtained by controlling the Lewis basicity of the K(2)S/As(2)S(3)/S flux. The optical, thermal, and spectroscopic properties of the compounds are reported.