Chirality Generation in Supramolecular Clusters: Analogues of Octacoordinated Polyhedrons

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• 作者：Toshiyuki Sasaki ; Yoko Ida ; Tetsuharu Yuge ; Atsushi Yamamoto ; Ichiro Hisaki ; Norimitsu Tohnai ; Mikiji Miyata
• 刊名：Crystal Growth & Design
• 出版年：2015
• 出版时间：February 4, 2015
• 年：2015
• 卷：15
• 期：2
• 页码：658-665
• 全文大小：681K
• ISSN：1528-7505

文摘

Metal-free supramolecular clusters, comprising organic salts of triphenylacetic acid and primary amines, were characterized for the first time as the analogues of octacoordinated polyhedrons with a novel supramolecular chirality in the crystalline state. A ternary system yields triangular dodecahedrons with chiral belts composed of four triphenylmethyl (trityl) groups involving right- or left-handed twist combinations (螖:螞 = 4:0 or 0:4). The 12 benzene rings are divided into three layers along a 2-fold axis of symmetry, affording a structure that is similar to a censer (a traditional vessel for fragrance) comprising three parts: a head, body, and foot. A binary system with t-butylammonium or t-amylammonium provides different chiral triangular dodecahedrons, while the system with isobutylammonium provides a trans-bicapped octahedron with a 3-fold rotational axis of symmetry to yield a chiral belt of four trityl groups (螖:螞 = 3:1 or 1:3).