title: Energy Aspects of Thermal Molecular Switching: Molecular Thermal Hysteresis of Helicene Oligomers.
abstract: Molecular switching is a phenomenon by which a molecule reversibly changes its structure and state in response to external stimuli or energy. Herein, molecular switching is discussed from thermodynamic and kinetic aspects in terms of energy supply with an emphasis on the thermal switching exhibited by helicene oligomers. It includes the inversion of relative thermodynamic stability induced by temperature changes and molecular thermal hysteresis in a closed system. The thermal phenomenon associated with the oligomers involves population/concentration changes between metastable states under nonequilibrium thermodynamic control.
authors.affiliation: Department of Organic Chemistry, Graduate School of Pharmaceutical Sciences, Tohoku University, 6-3 Aoba, Sendai 980-8578 (Japan), Fax: (+81) 22-795-6811.
authors.forename: Masanori
authors.initials: M
authors.lastname: Shigeno
authors.affiliation: Department of Organic Chemistry, Graduate School of Pharmaceutical Sciences, Tohoku University, 6-3 Aoba, Sendai 980-8578 (Japan), Fax: (+81) 22-795-6811.
authors.forename: Yo
authors.initials: Y
authors.lastname: Kushida
authors.affiliation: Department of Organic Chemistry, Graduate School of Pharmaceutical Sciences, Tohoku University, 6-3 Aoba, Sendai 980-8578 (Japan), Fax: (+81) 22-795-6811. yama@m.tohoku.ac.jp.
authors.forename: Masahiko
authors.initials: M
authors.lastname: Yamaguchi
mesh_terms: D007700:Kinetics; D011083:Polycyclic Compounds / Q000737:chemistry*; D013816:Thermodynamics
chemical_list: D011083:Polycyclic Compounds; C031660:helicenes
keywords: helical structures; molecular dynamics; nonequilibrium processes; thermal hysteresis; thermodynamics