A new, deep quinoxaline-based cavitand receptor for the complexation of benzene

We report the synthesis of a new macrocyclic receptor, namely 2,8,14,20-tetra­hexyl-4,24:6,10:12,16:18,22-O,O′-tetra­kis­[2,3-di­hydro-[1,4]dioxino[2,3-g]quinoxalin-7,8-di­yl]resorcin[4]arene, DeepQxCav, obtained by the addition of ethyl­ene glycol di­tosyl­ate to an octa­hydroxy quinoxaline cavitand. A 1:1 supra­molecular complex of this cavitand with benzene has been obtained and analysed through X-ray diffraction analysis. The complex, of general formula C(92)H(88)O(16)N(8)·C(6)H(6), crystallizes in the space group C2/c, with the cavitand host located about a twofold rotation axis. The benzene guest, which is held inside the cavity by C—H⋯π inter­actions and dispersion forces, is disordered over two equivalent sites, one in a general position and one lying on a twofold axis. The crystal structure features C—H⋯O hydrogen bonds and C—H⋯π inter­actions involving the alkyl chains, the aromatic rings, and the O atoms of the dioxane moiety of the resorcinarene scaffold. The crystal studied was refined as a two-component twin.