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Molecular assemblies based on helical motifs are of substantial interest from the view point of fundamental science as well as application. In this study, we propose a new class of organic crystal, that is, heteroH-MOC (multi-component organic crystal containing different kinds of helical motifs consisted of different components), and describe successful construction of heteroH-MOCs with P21 and P212121 space groups by using steroidal bile acids and cinchona alkaloids. In the P21 crystals, two kinds of helices composed of the steroid and alkaloid are arranged in a parallel fashion, while, in the P212121 crystals, those are in a perpendicular fashion. It is remarkable that, in such systems, particularly in the latter crystals, components ingeniously achieved highly-ordered synchronization of periodicity (helical pitches r and periodic distances in the array of helices p), which is first demonstrated in this study through hierarchical interpretation of the crystal structures.
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Organic & Biomolecular Chemistry
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