Abstract
The reaction of Au with a molten mixture of A2S/Sb/S (A=Rb, Cs) produced the isostructural quaternary compounds A2AuSbS4. The yellow-brown crystals of Rb2AuSbS4 (I) and yellow crystals of Cs2AuSbS4 (II) are stable in air and water for several days and for over a month for I and II, respectively. The structure of Rb2AuSbS4 crystallizes in the space group Pbcm (#57) and at 23°C a=6.804(3) Å, b=20.127(4) Å, c=7.195(4) Å, V=985(1) Å3, Z=8. Final R/Rw=4.5/6.6%. This structure consists of one-dimensional [AuSbS4]n2n− chains separated by A+ cations. The chains are comprised of Au+ cations linearly coordinated to [SbS4]3− tetrahedra. The compounds were characterized with differential thermal analysis (DTA), far-IR, Raman, and solid-state UV/vis diffuse reflectance spectroscopy.
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