Abstract

Inclusion selectivity has been examined for xylene isomers and benzene in the Hofmann-dma-type Cd[NH- (CH3)2]2Ni(CN) 4 metal complex host. This has a layered structure of a two-dimensionally extended cyanometal complex network with the dimethylamine ligands protruding up and down from the network. The o-isomer is preferentially enclathrated in the metal complex host from the mixtures of xylene isomers, but the presence of benzene in the mixture makes the p-isomer more preferable. Benzene is enriched from the mixtures with xylene isomers at very low concentrations. The selectivity behavior is discussed based on the crystal structures of the relevant clathrates.

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