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Packing host-guest

High-density packed host-guest crystai... [Pg.55]

This entry to supramolecular chemistry allows one, at the same time, to develop a host-guest chemistry because the space inside the cucurbituril barrel is sufficient to confine small "guesf molecules. This is illustrated with the crystallization of the supramolecular adduct [W3S4(H20)8Cl](pyH ccuc) Cl4a 5.5 H2O with a pyridinium cation inside the cucurbituril cavity [48]. The introduction of guest molecules may vary the net charge on the assembly and consequently the whole packing in the solid state. [Pg.118]

Crystallization of 5 in the open air from an initially aprotic solvent (N,N-dimethyl-acetamide) led to a non-layered structure which is characterized by a three-dimensional lattice of loosely-packed host species interspaced by channel-type zones accommodating the solvent guest components (Fig. 9). [Pg.17]

Fig. 18. Closed H-bond loops (dotted and hatched regions indicating host-guest and host-host interactions, respectively) in alcohol inclusions of l and 26. Packing excerpts show the rings formed in the coordinatoclathrates (a) 1 1-PiOH (2 1)77>, (b) 26 1-BuOH (1 1) 71 (H-atoms of the hosts are shown as sticks only)... Fig. 18. Closed H-bond loops (dotted and hatched regions indicating host-guest and host-host interactions, respectively) in alcohol inclusions of l and 26. Packing excerpts show the rings formed in the coordinatoclathrates (a) 1 1-PiOH (2 1)77>, (b) 26 1-BuOH (1 1) 71 (H-atoms of the hosts are shown as sticks only)...
Fig. 20. Schematic and packing excerpt illustrations of the principal H-bond interactions found in the carboxylic acid clathrates of 179) and 26 50-71>. The bold H stands for host, G for guest. H-bond rings coming from either host-host, host-guest, or from guest-guest dimers are indicated by... Fig. 20. Schematic and packing excerpt illustrations of the principal H-bond interactions found in the carboxylic acid clathrates of 179) and 26 50-71>. The bold H stands for host, G for guest. H-bond rings coming from either host-host, host-guest, or from guest-guest dimers are indicated by...
Enantioselective photocyclization of 74 occurred efficiently in the inclusion complex with 2a. In particular, the selectivity is very high in the case of 74a. However, control is inefficient in the 1 2 complex 85 composed of 2a and 74c. The host guest ratio probably depends on the packing of the components in the crystal. The packing is... [Pg.240]

In solid-state host-guest or clathrate compounds the guest is included within a gap in the packing of... [Pg.79]

Solid state host-guest compounds or clathrates are examples of co-crystals where the host packs in such a way as to leave a gap in the crystal lattice suitable for inclusion of the guest. [Pg.471]

Figure 8 Inclusion compound of ( )-methyl lactate and 2. (a) Host-guest hydrogen bonding (A), (b) Sheet structure of dipeptide backbone, (c) Packing (CPK model) of the inclusion compound. Figure 8 Inclusion compound of ( )-methyl lactate and 2. (a) Host-guest hydrogen bonding (A), (b) Sheet structure of dipeptide backbone, (c) Packing (CPK model) of the inclusion compound.
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See also in sourсe #XX -- [ Pg.88 ]



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Host packing

Host-guest

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