Inclusion properties of hydroxy host compounds
type: CreativeWork
description: Inclusion compounds can be defined as those in which one type of molecule is able to enclose another molecule (usually smaller) within its structure, leaving the bonding systems of both components unchanged. The molecular network and the enclosed species are usually referred to as the "host" and "guest" respectively. The ability of four hydroxyl-containing molecules to form inclusion compounds was studied. Each of these molecules has a tetrahedral carbon or silicon atom bonded to an hydroxyl group and shielded by two or three aromatic moieties. The bulkiness of these molecules prevents them from crystallizing in a close-packed fashion while the hydroxyl groups enable them to participate in hydrogen bonding. The formation and characterisation by single crystal X-ray diffraction methods of two non-porous α-phase compounds and eighteen inclusion compounds have been described. The inclusion compounds were divided into four classes : Class A consisted of compounds of 1, 1,2,2-tetraphenylethane-1,2-diol, Class B consisted of compounds of triphenylmethanol, Class C consisted of compounds of triphenylsilanol and Class D consisted of compounds of tri-1-naphthylsilanol. A number of guest compounds were chosen. Most had at least one atom which could act as an acceptor in a hydrogen bond. Hydrogen bonding (host-host, host-guest or a combination of these) proved to be the greatest stabilizing force in these compounds. The shape and size of the cavities available for guests were analysed by means of volume calculations. The thermal decomposition of the inclusion compounds was studied by Thermogravimetry (TG) and Differential Scanning Calorimetry (DSC), to determine the forces holding the guest within the structure and the changes in the host lattice as the guest was desorbed. X-ray powder diffraction methods were also used to confirm phase changes that occurred with guest loss. In addition, Thermogravimetry was used to determine the activation energy of the guest desorption proce…
abstract: Inclusion compounds can be defined as those in which one type of molecule is able to enclose another molecule (usually smaller) within its structure, leaving the bonding systems of both components unchanged. The molecular network and the enclosed species are usually referred to as the "host" and "guest" respectively. The ability of four hydroxyl-containing molecules to form inclusion compounds was studied. Each of these molecules has a tetrahedral carbon or silicon atom bonded to an hydroxyl group and shielded by two or three aromatic moieties. The bulkiness of these molecules prevents them from crystallizing in a close-packed fashion while the hydroxyl groups enable them to participate in hydrogen bonding. The formation and characterisation by single crystal X-ray diffraction methods of two non-porous α-phase compounds and eighteen inclusion compounds have been described. The inclusion compounds were divided into four classes : Class A consisted of compounds of 1, 1,2,2-tetraphenylethane-1,2-diol, Class B consisted of compounds of triphenylmethanol, Class C consisted of compounds of triphenylsilanol and Class D consisted of compounds of tri-1-naphthylsilanol. A number of guest compounds were chosen. Most had at least one atom which could act as an acceptor in a hydrogen bond. Hydrogen bonding (host-host, host-guest or a combination of these) proved to be the greatest stabilizing force in these compounds. The shape and size of the cavities available for guests were analysed by means of volume calculations. The thermal decomposition of the inclusion compounds was studied by Thermogravimetry (TG) and Differential Scanning Calorimetry (DSC), to determine the forces holding the guest within the structure and the changes in the host lattice as the guest was desorbed. X-ray powder diffraction methods were also used to confirm phase changes that occurred with guest loss. In addition, Thermogravimetry was used to determine the activation energy of the guest desorption proce…
author: Bourne, Susan Ann
language: eng
date published: 1991
date modified: 2026-07-24T01:33:45Z
provider: University of Cape Town
publisher: Networked Digital Library of Theses and Dissertations
type: WebPage
source organization: Department of Chemistry

PropertyValue
property ID: Handle
value: http://hdl.handle.net/11427/22504