title: Unconventional thermodynamically stable cis isomer and trans to cis thermal isomerization in reversibly photoresponsive [0.0](3,3')-azobenzenophane.
abstract: Sterically hindered [0.0](3,3')-azobenzenophane exhibits thermal trans-to-cis isomerization to the thermodynamically stable cis-cis isomer, and reversible photochemical isomerization with good fatigue resistance.
authors.affiliation: Nanotechnology Research Institute, National Institute of Advanced Industrial Science and Technology, Central 5, 1-1-1 Higashi, Tsukuba, Ibaraki 305-8565, Japan. y-norikane@aist.go.jp
authors.forename: Yasuo
authors.initials: Y
authors.lastname: Norikane
authors.forename: Ryuzi
authors.initials: R
authors.lastname: Katoh
authors.forename: Nobuyuki
authors.initials: N
authors.lastname: Tamaoki