The crystal structure of butylammonium dodecylsulfate

C 16 H 37 NO 4 S, monoclinic, P 2 1 /m, a = 25.398(11), b = 7.366(4), c = 5.459(3) Å, β = = 91.53(4)°, Z = 2, V = 1020.91 Å 3 , D x = 1.104 g/cm 3 , μ(MoKα) = 0.175 mm −1 , λ(MoKα) = 0.71069 Å. The crystal structure of this anionic surfactant was solved by Patterson methods and refined to R = 0.109 for 2497 reflections. Dodecyl‐ and butylchains are statistically disordered. Loose package of butyl chains enables strong vibration motions. The polar region satisfies the mirror plane which is by the remaining structure parts only statistically fulfilled. Statistical disorder was included in the structure refinement by separation of some atom positions. The sublattice of the hydrocarbon chains is nearly O⟂ with a s = 4.77, b s = 7.37, c s = 2.52 Å.