Channels, supramolecular complexes

Channels, supramolecular complexes, 46 222-227, 283-289, 291-292 Charge, metal(I) coordination number effects, 37 38-39... 

The central part of cell walls is a membrane consisting of complex self-assembled structures with built-in channels that execute complicated functions, e.g., the transport of ions briefly discussed in Section 5.3.4). Creating artificial membranes mimicking the functioning of biological membranes is one of the important tasks of supramolecular chemistry. 

Zeolites 2D for classical, 2D and 3D for superzeolites varies Chemical synthesis Months to years Particles could be grown in situ or incorporated into channels complex supramolecular architecture was possible 463,464... 

Interesting properties and applications have been reported so far. Liquid crystalline crowns can be used as sensors for salts or even chirality. Luminescence can be observed when choosing appropriate metals for complexation. Supramolecular structures such as channels and wires are readily available. Combined with polymerizable side groups, matrix- or membrane-bound supramolecular structures can be obtained. 

Many natural channels, particularly those for simple ions, form at the confluence of complex proteins. This mechanism has been simplified by the Gokel group which has prepared alkyl-terminated hexapeptides that contain a short proline containing peptide sequence, GGGPGGG, similar to that found in natural Cl -selective channels [14], These compounds give Cl- selectivity when anchored in phospholipid vesicles. It is assumed that channels form by supramolecular aggregation of the hexapeptides around the proline motif, shown in Fig. 5.6. Such a simple transport mechanism has yet to be seen in Nature but it would not be too surprising if one were to be found. 

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