In recent years a rapidly growing interest in inclusion phenomena has been focused in two major directions. In the first, the binding or complexation of guest species by unimolecular hosts in solution has received much attention, and excellent recent reviews have appeared for two particularly important classes of host, the naturally-occurring cyclodextrinsl-3 and compounds of the synthetic 'crown' type.4 The second equally fascinating aspect of 'host and guest chemistry' relates to the study of crystalline multimolecular inclusion c ~r n p o u n d s , ~-~~ which may be sub-classified as the true clathrate type22 in which the guest molecules are imprisoned in discrete closed cavities or cages; the channel type23 in which the guest species are accommodated in continuous canals running See for example D.
Two mo I ecu I es of Zr4,6-tris[4-( 2-p henyl pro pa n-2-yl ) p henoxyl-1,3,5-t riazi ne 1 undergo self-assem bly to produce a composite unit, termed Piedfort unit, which acts as a single hexa-host molecule; the structure of this new host unit, found both in the Ir4-dioxane inclusion compound of 1 and in its unsolvated crystal, has been elucidated by X-ray methods.
The title compound (1 b), a new non-planar chlorocarbon possessing approximate D3d symmetry, has been prepared by chlorination of coronene (la); complete substitution of (1 b) by arenethiolate nucleophiles in the dipolar aprotic solvent DMEU (1,3-dimethylimidazolidin-2-one) yields the dodecathioethers (2a) and (Zb), members of a new prospective host series.
scite is a Brooklyn-based organization that helps researchers better discover and understand research articles through Smart Citations–citations that display the context of the citation and describe whether the article provides supporting or contrasting evidence. scite is used by students and researchers from around the world and is funded in part by the National Science Foundation and the National Institute on Drug Abuse of the National Institutes of Health.