Physicochemical Aspects of Host−Guest Compounds

Abstract

The macro properties of crystalline inclusion compounds depend on their structures. Their thermal stabilities are a function of the strength and the directionality of the various nonbonded interactions occurring in the host-guest assembly. Their lattice energies, as measured by the method of atom-atom potentials, correlate with the thermodynamics of the guest-release reactions and the selectivity that a given host displays for a particular guest. The kinetics of solid-host:vapor-guest reactions and of guest exchange are important in our understanding of catalytic processes. Crystal engineering, in which materials of predetermined properties may be synthesized, is still at the empirical stage.

Selenium/Zeolite Y Nanocomposites

“…While the investigation of the physicochemical aspects of hostguest compounds is still at an early stage, it is abundantly clear that the host-guest interaction represents one of the most intriguing facets of semiconducting nanocomposites. 56 We thank our collaborators who have contributed their enthusiasm, ideas, and devoted efforts to these studies. Their names can be found in the papers cited herein.…”

Molecular Recognition in Organic Crystals: Directed Intermolecular Bonds or Nonlocalized Bonding?

“…[1] Co-crystals, crystals containing more than one component, are usually obtained not by the sheer accidents of crystallization from a mixed solution, but by design, by careful selection of molecules that are chosen to interact specifically with one another, or else they involve inclusion of small molecules within the interstices between large molecules that form the main framework of the crystal. [2] A better understanding of these molecular recognition processes among comparatively simple molecules seems an absolute necessity if we are ever to understand the enormously efficient and specific molecular recognition processes involved in enzyme-co-enzyme-substrate complexes or in the reconstitution of ribosomal particles from their dissociated proteins and nucleic acids. [3] "Molecular recognition" in its modern parlance implies that when two molecules approach one another in a particular way, the potential energy of the pair decreases significantly more than it would for a different manner of approach because of some specific interaction between the molecules.…”

Thermal analysis of clathrates of tripeptide LLL with organic compounds and water

“…2. A similar approach for estimation of the thermal stability of host-guest compounds (T onset -T b ) was used early [43].…”