Structures of two modifications of 1-methylthio-2-methylsulfonylethane at 87 K

C4H10O2S2, Mr = 154.25, monoclinic, T = 87(1) K. (α) P21/n, a = 10.520(2), b = 5.818(1), c = 12.029(2) Å, β = 92.86(1)°, V = 735.3(2) Å3, Z = 4, Dx = 1.3934(4) Mgm−3, λ(MoKᾱ) = 0.71073 Å, μ = 0.617 mm−1, F(000) = 328, R = 0.023 for 2080 reflections. (β) P21/c, a = 10.413(1), b = 6.706(1), c = 10.229(1) Å, β = 94.32(2)°, V = 712.3(2) Å3, Z = 4, Dx = 1.4384(8) Mgm−3, λ(MoKᾱ) = 0.71073 Å, μ = 0.637 mm−1, F(000) = 328, R = 0.021 for 2007 reflections. The main conformational distinction between the two forms is the −synclinal and +synclinal orientation of the C(Me)–S–C–C in the thio end of the α and β forms, respectively. The bond lengths and angles are very similar in the two forms, and in good agreement with some related sulfone and sulfide structures.