2 (C₁₇H₄₁NO₆SSi₄) . H₂O. M_r=1017.88, triclinic, space group P-1. The molecules are arranged in bilayers. The molecules in each bilayer are held together by electrostatic forces, i.e., O-N⁺ contacts, and hydrogen bonds. The asymmetric unit consists of two partly disordered siloxane molecules and one water molecule. The structure of the bilayers is virtually the same at 163 K and room temperature, but the stacking of the bilayers is different. The Si-O-Si bond angles at low temperature are significiantly smaller than at room temperature.

Keywords: silicon, siloxane, sulfobetaine, crystal structure, surfactant, polymorph

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