The structure of BaCoS2 is a slightly distorted monoclinic version of
the BaNiS2 structure (Grey & Steinfink (1970). J. Am. Chem. Soc. 92, 5
093-5095.] The small change in the monoclinic angle from 90 to 90.43 (
4)-degrees brings the atoms closer together along the former [110BAR]
tetragonal direction and further apart along the former [110] directio
n.