Crystal engineering of porosity
Date
2006-12
Authors
Journal Title
Journal ISSN
Volume Title
Publisher
Stellenbosch : University of Stellenbosch
Abstract
Inclusion and porosity properties of the following supramolecular solid-state hosts
were 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. Inclusion
phenomena involving encapsulation of liquids were studied using single-crystal x-ray
diffraction methods. Several guest-free host structures (α phases) were structurally
elucidated and their gas sorption properties were investigated.
Studies of the sorption properties of seemingly nonporous materials were carried
out to provide insight into this rare phenomenon. Water and iodine sorption by a
polymorph 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 the
solid-state requires reassessment.
Gas sorption studies were carried out using apparatus devised and presented
here. These include sorption apparatus and a device to determine single-crystal
structures under controlled gas atmospheres.
Description
Thesis (MSc (Chemistry and Polymer Science))--University of Stellenbosch, 2006.
Keywords
Supramolecular chemistry, Crystal engineering, Porosity, Crystal growth, Dissertations -- Chemistry, Theses -- Chemistry