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NaAsS 2  is monoclinic,  P 2 1 / c ,  a  = 5.867(2) Å,  b  = 11.305(3) Å,  c  = 5.586(2) Å,  β  = 92.95(2)°,  Z  = 4. The structure has been determined from three-dimensional x-ray data collected by counter methods, and refined by least-squares to a final conventional  R  value (on F) of 0.0311 for 651 measured reflections. The structure can be considered as an ordered derivative of the NaCl type, and is similar to the structure of BaSnS 2 . A salient structural feature is the presence of infinite chains of composition AsS 2  which run in the direction of  c  axis. The metal ordering observed in this structure is different from that present in KSbS 2 , which is a NaCl ordered derivative structure as well.

NaAsS 2 , a synthetic sulfosalt related to the NaCl type*