title: Expanding dendrons. The photoisomerism of folded azobenzene dendrons.
abstract: Irradiation of a folded azobenzene dendron system triggers a large, reversible structural expansion. The dendrons adopt a compact helical conformation in the stable E form owing to the E geometry of azo linkage and the syn-syn preference of the dendritic branch points. E --> Z photoisomerization disrupts this folded conformation in a manner that decreases the packing efficiency and results in an expansion in hydrodynamic volume.
authors.affiliation: Department of Chemistry, The Ohio State University, 100 West 18th Avenue, Columbus, Ohio 43210, USA.
authors.forename: Christopher J
authors.initials: CJ
authors.lastname: Gabriel
authors.forename: Jon R
authors.initials: JR
authors.lastname: Parquette