Crystal data for Rb 2 CoCl 4 .2H 2 O

This compound is triclinic, probably isostructural with Rb 2 MnCl 4 .2H 2 O, the space group is P 1 or P , a = 6.50 ± 0.04, b = 6.99 ± 0.04, c = 5.58 ± 0.03 Å, α = 92.8 ± 0.1°, β = 97.2 ± 0.1°, γ = 65.4 ± 0.1°, V = 228.76 ± 0.06 Å 3 , Z = 1, D m = 2.94 ± 0.03, D x = 2.96 g cm −3 . The precession method and Zr‐filtered Mo K α radiation (γ = 0.7107 Å) were used. The description of the specimen preparation, chemical analysis, morphology and comparison with similar substances have been deposited.