✍ Scribed by Hiromitsu Maeda
No coin nor oath required. For personal study only.
The cover picture shows the two representative characteristics of pyrrole, “duality” as a hydrogen‐bonding acceptor (or a metal‐coordination ligand) N and a hydrogen‐bonding donor (or an anion‐binding ligand) NH and “planarity” to form stacking assemblies, depicted by the disks of Yin and Yang. Acyclic π‐conjugated oligopyrrole derivatives, though less extensively studied so far, often potentially have even more advantages than cyclic ones. For example, the linear oligopyrroles prepared by the author form infinite and discrete coordination oligomers to give emissive spherical colloids and nanorings, hydrogen‐bonding supramolecular assemblies to afford unique crystalline morphologies, and stacking structures to yield organogels that can be controlled by anions. Details are presented in the Microreview by H. Maeda on p. 5313 ff. This picture has been provided by Mr. Takashi Hashimoto, one of the members in the author's group.
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## Abstract **The cover picture shows** the molecular structure (center) of the parent pyrrolo‐tetrathiafulvalene, which has been incorporated into a number of molecular and supramolecular systems, such as cyclophanes (upper right), rotaxanes (lower right), porphyrins (lower left), and calixpyrrole