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 +NH 3 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.
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