Supramolecular sheet

Maji, S. K., Haidar, D., Drew, M. G. B., Banerjee, A., Das, A. K., and Banerjee, A. (2004). Self-assembly of /1-turn forming synthetic tripeptides into supramolecular //-sheets and amyloid-like fibrils in the solid state. Tetrahedron 60, 3251-3259. 

Keywords Hydrogen bonding Supramolecular chains Supramolecular sheets Coordination Guanidine... 

Figure 4.9. Schematic representations of the crystal structures of the salts of enantiopure 5 with / -substiluted 1-arylethylamines in success, (a) Less soluble salts, in which the formation of a stable supramolecular hydrogen-bond sheet, the realization of efficient CII—ti interaction, and the close packing of the sheets are achieved, (b) More soluble salts, in which efficient CH n interaction is not realized and the close packing of the supramolecular sheets a stable supramolecular hydrogen-bond sheet is not formed, (c) More soluble salts, in which a stable supramolecular hydrogen-bond sheet is formed and the close packing of the supramolecular sheets is achieved, while efficient interaction is not realized.

Foggasy and co-workers. In many cases, the hydrogen-bond chains form a supramolecular sheet. Thus it is strongly suggested that the chiral discrimination of racemic amines by enantiopure 9 mainly occurs through the formation of a supramolecular hydrogen-bond sheet (chain) of (9-H), which interact with the amine to discriminate its chirality. 

As shown in Table 5.4, the resolution efficiencies for the p-substituted 1-phenyl-efhylamine derivatives were greatly improved, as was expected, when p-methyl-and p-methoxymandelic acids were used in the place of mandelic acid. These results strongly support our explanation that two factors, hydrogen-bonding interaction to form a supramolecular sheet consisting of 2i-columns and van der Waals interaction between the sheets, govern the stability of diastereomeric salts [11]. The same factors were also found in the diastereomeric salts of racemic arylalka-noic acids with enantiopure amino alcohols [12]. 

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