Structural characterization of the supramolecular complex between a tetraquinoxaline-based cavitand and benzonitrile

Abstract

The structural characterization is reported of the supramolecular complex between the tetraquinoxaline-based cavitand 2,8,14,20-tetrahexyl-6,10:12,16:18,22:24,4-O,O′-tetrakis(quinoxaline-2,3-diyl)calix[4]resorcinarene (QxCav) with benzonitrile. The complex, of general formula C84H80N8O8·2C7H5N, crystallizes in the space group P\overline{1} with two independent molecules in the asymmetric unit, displaying very similar geometrical parameters. For each complex, one of the benzonitrile molecules is engulfed inside the cavity, while the other is located among the alkyl legs at the lower rim. The host and the guests mainly interact through weak C—H...π, C—H...N and dispersion interactions. These interactions help to consolidate the formation of supramolecular chains running along the crystallographic b-axis direction.

Keywords

• crystal structure
• quinoxaline cavitands
• inclusion compounds
• benzonitrile