title: Jumping Crystals of Pyrene Tweezers: Crystal-to-Crystal Transition Involving π/π-to-CH/π Assembly Mode Switching.
abstract: Crystals of pyrene tweezers 1 with interdigitating pyrenyl blades jump vigorously at around 160 °C. Single-crystal X-ray diffraction analysis before jumping revealed the presence of a "pyrene tetrad" in the crystal lattice, where four pyrenyl blades are π-stacked on top of each other. Upon heating the crystal to induce the jumping event, inner two pyrenyl blades in the "pyrene tetrad" probably rotate to switch off their π-stacking interaction with the neighboring outer pyrenyl blades and form new CH-π bonds. Different from reported salient crystals, our crystal jumps with the release of CHCl3as inclusion solvent.
authors.affiliation: Department of Chemistry and Biotechnology, School of Engineering, The University of Tokyo, 7-3-1 Hongo, Bunkyo-ku, Tokyo, 113-8656, Japan.
authors.forename: Yoshiki
authors.initials: Y
authors.lastname: Shibuya
authors.affiliation: Department of Chemistry and Biotechnology, School of Engineering, The University of Tokyo, 7-3-1 Hongo, Bunkyo-ku, Tokyo, 113-8656, Japan.
authors.forename: Yoshimitsu
authors.identifier: http://orcid.org/0000-0002-8356-7605
authors.initials: Y
authors.lastname: Itoh
authors.affiliation: Department of Chemistry and Biotechnology, School of Engineering, The University of Tokyo, 7-3-1 Hongo, Bunkyo-ku, Tokyo, 113-8656, Japan.|RIKEN Center for Emergent Matter Science, 2-1 Hirosawa, Wako, Saitama, 351-0198, Japan.
authors.forename: Takuzo
authors.initials: T
authors.lastname: Aida
keywords: crystal engineering; crystal polymorphs; molecular tweezers; self-assembly; thermosalient effects