K.C. Corin

pH control of guest selectivity by inclusion

The structures of the inclusion compounds formed by a diol host with aniline and benzylamine have different host ∶ guest ratios and topologies. Competition experiments show that guest selectivity is dramatically changed by pH control.

Enclathration of bases by a fluorenyl host: structure, stability and selectivity

The host compound 9,9′-(1,4-phenylene)-bis-(fluoren-9-ol) forms inclusion compounds with pyridine, the isomers of picoline and morpholine. The structures of the inclusion compounds are stabilised by (Host)O–H⋯N(Guest) hydrogen bonds. Unusually, the structure of the host containing 4-picoline and morpholine displays both cis- and trans-conformation. The enthalpy of enclathration of these guests was estimated by packed-column chromatography.

Separation by Inclusion: Selectivity by Tetraphenylethanediol of Toluene and Mono-halo Substituted Benzenes

The host 1,1,2,2-tetraphenyl-1,2-ethane diol was found to form inclusion compounds with the guest toluene and three mono-halo substituted benzenes; chloro-, bromo-, and iodo-benzene. These compounds were characterised by thermal analysis, which showed host:guest ratios of 1:1/2, and their structures were elucidated and compared. Two-, three- and four-component competition experiments were conducted to investigate the selectivity of the host for the respective guests and to determine the separation capabilities of this system.