title: A light-gated molecular brake with antilock and fluorescence turn-on alarm functions: application of singlet-state adiabatic cis → trans photoisomerization.
abstract: A light-gated molecular brake that displays both high braking power (∼10(7)) and high switching power (∼74%) is reported. The lower rate for brake-on than for brake-off switching of the pentiptycene rotor mimics the function of an antilock braking system (ABS) for vehicles on a loose surface. The brake is also armed with a fluorescence turn-on alarm for accidental deactivation of the ABS function by acids. All of these features are associated with the highly efficient singlet-state adiabatic cis → trans photoisomerization of the phenylstilbene chromophore.
authors.affiliation: Department of Chemistry, National Taiwan University , No 1 Sec 4 Roosevelt Road, Taipei, Taiwan 10617.
authors.forename: Wei-Ting
authors.initials: WT
authors.lastname: Sun
authors.forename: Guan-Jhih
authors.initials: GJ
authors.lastname: Huang
authors.forename: Shou-Ling
authors.initials: SL
authors.lastname: Huang
authors.forename: Ying-Chih
authors.initials: YC
authors.lastname: Lin
authors.forename: Jye-Shane
authors.initials: JS
authors.lastname: Yang