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Inclusion compounds of l,d-dipeptide with small sulfoxides: flexible sheet structure of (S)-phenylglycyl-(R)-phenylglycine |
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| Authors: | Motohiro Akazome Katsuyuki Ogura |
| Affiliation: | a Department of Applied Chemistry and Biotechnology, Faculty of Engineering, Chiba University, 1-33 Yayoicho, Inageku, Chiba 263-8522, Japan b Graduate School of Science and Technology, Chiba University, 1-33 Yayoicho, Inageku, Chiba 263-8522, Japan |
| Abstract: | A heterochiral l,d-dipeptide, (S)-phenylglycyl-(R)-phenylglycine (SR-1), formed inclusion compounds with some small dialkyl sulfoxides. By their single-crystal X-ray analyses, we observed monolayer structures, where SR-1 molecules are arranged in parallel to construct a wavy sheet. The sulfoxides were accommodated in a channel cavity between the monolayers of SR-1 by hydrogen bonding with +NH3 of SR-1. Notably, the sheet of SR-1 is so flexible to change its wavy degree in response to the volume of the included sulfoxides. Furthermore, we could analyze the structure of crystalline SR-1 without any sulfoxide, which has a bilayer structure. |
| Keywords: | Crystal engineering Inclusion compounds Dipeptides Sulfoxides Molecular recognition |
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