ja8b03833_si_006.cif (4.4 MB)
Compression of a Flapping Mechanophore Accompanied by Thermal Void Collapse in a Crystalline Phase
dataset
posted on 2018-05-10, 00:00 authored by Takuya Yamakado, Kazuya Otsubo, Atsuhiro Osuka, Shohei SaitoMechanical control of the molecular
energy landscape is an important
issue in modern materials science. Mechanophores play a unique
role in that the mechanical responses are induced against the activation
barrier for intramolecular transformation with the aid of external
forces. Here we report an unprecedented activation process of a flexible
flapping mechanophore. Namely, thermal void collapse in a crystalline
phase triggers mechanophore compression in a definite proportion.
Unfavored conformational planarization of the flapping mechanophore
is compulsorily induced by packing force, leading to a total energy
gain in crystal packing. Fluorescence chromism indicates extended
π conjugation resulting from the mechanophore compression,
giving rise to an energy transfer from the unpressed to compressed
conformers.