title: Azobenzene derivatives carrying a nitroxide radical.
abstract: Several trans-azobenzene derivatives carrying a nitroxide (aminoxyl) radical (2a, 6a-12a) were prepared, and their photoisomerization reactions to the corresponding cis-isomers were investigated. Although no fruitful results could be obtained for the photoisomerizations of the derivatives with para-subsituents (9a-12a), the unsubstututed derivatives at the para-position (2a, 6a, 7a, 8a) were found to show photoisomerizations by irradiation to give the corresponding cis-isomers (2b, 6b, 7b, 8b), being isolated as relatively stable solid materials, and the change of the intermolecular magnetic interactions was apparently observed by the structural change for each photochromic couple.
authors.affiliation: Department of Material Science, Graduate School of Material Science, University of Hyogo, 3-2-1 Kouto, Kamigori, Hyogo 678-1297, Japan. nakatuji@sci.u-hyogo.ac.jp
authors.forename: Shin'ichi
authors.initials: S
authors.lastname: Nakatsuji
authors.forename: Masahiro
authors.initials: M
authors.lastname: Fujino
authors.forename: Satoko
authors.initials: S
authors.lastname: Hasegawa
authors.forename: Hiroki
authors.initials: H
authors.lastname: Akutsu
authors.forename: Jun-ichi
authors.initials: J
authors.lastname: Yamada
authors.forename: Vladimir S
authors.initials: VS
authors.lastname: Gurman
authors.forename: Andrey
authors.initials: A
authors.lastname: Kh Vorobiev