Crystal engineering of porosity

[摘要] Inclusion and porosity properties of the following supramolecular solid-state hostswere investigated:• 2,7-dimethylocta-3,5-diyne-2,7-diol• 2-methyl-6-phenylhexa-3,5-diyn-2-ol• Dianin's compound• p-tert-butyl-calix[4]arene• 5,11,17,23-tetra-tert-butyl-25,26,27,28-tetramethoxy-2,8,14,20-tetrathiacalix[4]arene• Two discrete coordination metallocycles, [Ag2IMID2](BF4)2 and[Cu2(BITMB)2(Cl)4]All of these compounds form well-defined crystalline host structures. Inclusionphenomena involving encapsulation of liquids were studied using single-crystal x-raydiffraction methods. Several guest-free host structures (α phases) were structurallyelucidated and their gas sorption properties were investigated.Studies of the sorption properties of seemingly nonporous materials were carriedout to provide insight into this rare phenomenon. Water and iodine sorption by apolymorph of 5,11,17,23-tetra-tert-butyl-25,26,27,28-tetramethoxy-2,8,14,20-tetrathiacalix[4]arene shows that the conventional perception of sorption through thesolid-state requires reassessment.Gas sorption studies were carried out using apparatus devised and presentedhere. These include sorption apparatus and a device to determine single-crystalstructures under controlled gas atmospheres.

[发布机构] Stellenbosch University