title: Pairwise selective formation of aromatic stacks in a coordination cage.
abstract: An asymmetric alignment of electron-donating (D) and accepting (A) aromatics is a formidable challenge in the self-assembly of aromatic stacks because self-assembled aromatic stacks usually give alternating aromatic arrays, D-A-D-A-.... Here, we show that appropriate D-A guest pairs settle down in an electron-deficient aromatic box to yield an asymmetric quadruple A-D-A-A stacking sequence quantitatively. The inner D-A guest pair rapidly swaps their positions to create a dynamic aromatic array, and the swift guest motion largely depends on the donor aromatics.
authors.affiliation: Department of Applied Chemistry, School of Engineering, The University of Tokyo, 7-3-1 Hongo, Bunkyo-ku, Tokyo 113-8656, Japan.
authors.forename: Takashi
authors.initials: T
authors.lastname: Murase
authors.forename: Kosuke
authors.initials: K
authors.lastname: Otsuka
authors.forename: Makoto
authors.initials: M
authors.lastname: Fujita