Abstract
The alkali metal gold(I) chalcogenides RbAuS, CsAuS, RbAuSe, CsAuSe, NaAuTe, KAuTe, RbAuTe and CsAuTe have been synthesized by fusion reactions of the elements in an ampoule at 600 °C. NaAuTe and KAuTe crystallize with a layered structure which can be derived from the AlB 2-type (space group P6 3/ mmc; Z = 2) The gold and tellurium atoms form planar layers of hexagons 2 ∞[AuTe -], each kind of atom coordinated with three of the other kind. The atomic arrangements in RbAuTe and CsAuTe exhibit a new structure type (space group Pmma; Z=2) containing zigzag chains 1 ∞[AuTe -], in which the gold atoms are linearly coordinated by the tellurium atoms. Short gold-gold distances, of 2.968(1) rA in the rubidium and 3.106(1) rA in the caesium compound indicate possible interactions between the gold atoms with their d 10 configuration. The sulphides and selenides RbAuS, CsAuS, RbAuSe and CsAuSe (space group Cmcm; Z=4) also contain zigzag chains 1 ∞[AuX -] (X=S or Se). The gold-gold distances, between 3.298(1) rA in RbAuS and 3.431(1) rA in CsAuSe, are considerably longer than those in the corresponding tellurides.
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