STRUCTURES OF TRIMETHYLOXOSULFONIUM SALTS .7. THE DICHROMATE - [(CH3)3SO]2CR2O7

Trimethyloxosulfonium dichromate, C3H9OS+.Cr2O7-, M(r) = 402.32, monoclinic, P2(1), a = 8.917 (2), b = 10.319 (2), c = 8.418 (1) angstrom, beta = 102.30 (5)degrees , V = 756.8 (6) angstrom3, Z = 2, D(m) = 175 (3), D(x) = 1.765 Mg m-3, lambda(Mo Kalpha) = 0.71073 angstrom, mu = 1.698 mm-1, F(000) = 412, T = 293 K, final R = 0.038, wR = 0.038 for 2571 independent observed reflections. As usual, the dichromate ion is formed by two non-regular CrO4 tetrahedra, linked by the O(1) atom. The two pyramidal thiocations, (CH3)3SO+, with approximate 3m symmetry, have the same geometrical features.