Benzenes as guest

Channel-type structures are formed in the case of trans-s til bene and benzene as guests. In these cases at least two independent channels are... 

Figure 7 Homodimeric softball capsule hosting two molecules of benzene as guests.

Figure 8.13 Schematic view of the structure of the Ni-Ni Hofmann clathrate with benzene as guest molecule. The planes of the benzene guest molecules are perpendicular to the plane of the metal ions cross-linked by C=N entities. The disordered NH3 groups are represented as a superposition of four crystallographically equivalent configurations. Reproduced with permission of the International Union of Crystallography.

Changing of the flexible scissor-like element, as in 7, to an orthogonal and rigid version of this element, as in 22, reduces the activity of inclusion formation to a certain degree. Nevertheless very different guest molecules are readily accommodated in the crystal lattice of 22, they are proton donors (ethanol, 2-propanol) 47, H-bridge acceptors (dimethylformamide, dioxane), or benzene as an unpolar solvent48 ... 

A.Yu Manakov et al., New crystal structures of -[Ni(NCS)2(4-methylpyridine)4] clathrates with furan, tetrahydrofuran, methylene chloride, benzene + ethanol and methylcellosolve as guest molecules. J. Incl. Phenom. Mol. Recogn. Chem. 26, 1-20 (1996)... 

Out of the five solvents tested (CD2CI2, CDCI3, C6Dg, toluene-[Pg.122]

The cavities of cyclodextrins can well accommodate the cyclopentadienyl and benzene rings and as a result many metallocenes and half-sandwich tt-complexes have been incorporated as guests. 

Figure 14 Isoskeletal arrangements of the host compound 2,7-dimethyl-octa-3,5-diyne-2,7-diol with (a) carbon tetrachloride and (b) benzene as the guests. These two structures are isostructural with respect to only the host. ...

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