Dedicated to the late Professor Rudolf Hoppe on the occasion of his 100th birthday The reaction of NH 4 Cl with SO 3 leads to the chlorosulfate (NH 4 )[SO 3 Cl]. Depending on the reaction temperature two different modifications are obtained. At 80 °C the orthorhombic modification (NH 4 )[SO 3 Cl]-I is obtained (Pbca, Z = 16, a = 1078.03(4), b = 911.55(3), c = 1915.32(6), V m = 70.85 cm 3 /mol), at 120 °C monoclinic (NH 4 )[SO 3 Cl]-II forms (P2 1 /c, Z = 8, a = 846.19(3), b = 590.30(2), c = 852.29(7) pm, β = 100.516(10)°, V m = 68.48 cm 3 /mol). The observed bonds in the chlorosulfate anion are compared to the few know compounds of this type and to theoretical values based on DFT calculations.

TeO(SO4) is prepared by reaction of K2TeO4 with oleum (65% SO3) (evacuated glass ampoules, 250 °C, 1 d).

TeO(SO4) is prepared by reaction of K2TeO4 with oleum (65% SO3) (evacuated glass ampoules, 250 °C, 1 d).