Resorcin[4]arene dimer linked by eight water molecules and incorporating a tetraethylammonium ion: guest-driven capsule formation via cation–π interactions

X-Ray analysis of the co-crystallization compound formed between tetraethylresorcin[4]arene 1 and tetraethylammonium ion, Et4N+·1·1–·8H2O·2EtOH, has shown that the two ‘head-to-head’ arranged resorcinarenes are linked by eight water molecules and encapsulate a tetraethylammonium ion within the cavity via cation–π interactions.