Inclusion of volatile guests by a tetrapedal host: structure and kinetics

Abstract

The host compound tetra(3-hydroxy-3,3-diphenyl-2-propynyl)ethene, TET, forms inclusion compounds with acetone, dimethyl sulfoxide, dioxane and pyridine. All the structures were successfully solved in the triclinic space group P. We found variable host : guest ratios for the acetone (TET·ACE, H : G = 1 : 4), dimethyl sulfoxide (TET·DMSO, H : G = 1 : 4) and pyridine compounds (TET·PYR, H : G = 1 : 5). Solutions of the host compound and dioxane formed TET·2DIOX, H : G = 1 : 2 when left to crystallise at room temperature, whereas TET·4DIOX, H : G = 1 : 4 was formed during crystal growth at low temperature. We have correlated the structures with their thermal stabilities and kinetics of desolvation.