ORGANIC CHEMISTRY- I (NATURE OF BONDING AND STEREOCHEMISTRY)- INCLUSION COMPOUNDS
** An inclusion compound or an inclusion complex maybe defined as: 'A complex which comprises of one component (the host) forming a cavity. In the case of a crystal, it consists of a crystal lattice containing spaces in the shape of long tunnels or channels in which molecular entities of a second chemical species (the guest) are located. There exists no covalent bonding between the guest and host, the attraction being mainly attributed due to Van der Waals forces. ** Mylius observed Inclusion compounds for the first time in 1886. They appeared as unusual complexations occurring between hydroquinone and several volatile as compounds.
** A more convenient and workable classification, utilized in this review, is based upon the organization of inclusion compounds by their structure and properties as follows: 1 Polymolecular inclusion compounds -Channel-like spaces -Cage-like spaces 2. Monomolecular inclusion compounds 3. Products of the blue-iodine reaction 4. Macromolecular inclusion compounds.