Molecular complexes of dimethyl sulfoxide with tri- and dichloromethane.

Crystals of molecular complexes of dimethyl sulfoxide with trichloromethane (chloroform), (CH(3))(2)SO·2CHCl(3), (I), and dichloromethane, (CH(3))(2)SO·CH(2)Cl(2), (II), have been grown in situ. In both compounds, the components are linked together by (Cl)C-H···O interactions. The dimethyl sulfoxide molecules in (I) are bound into chains by C-H···O interactions. In (II), pairs of the components form centrosymmetric rings, linked into a three-dimensional network by C-H···O contacts and dipole-dipole interactions between dimethyl sulfoxide molecules.