title: Photoswitchable metal coordinating tweezers operated by light-harvesting dendrimers.
abstract: A dendrimer bearing two cyclam units linked by an azobenzene moiety, and luminescent naphthalene units at the periphery performs three different functions (light-harvesting, photoisomerization and coordination of metal ions) which can cooperate or interfere depending on the nature of the metal ion. It is thus an example of light controlled molecular tweezers in which Zn(II) coordination allows 100% efficient photosensitization of azobenzene switching, while Cu(II) shuts down azobenzene isomerization.
authors.affiliation: Department of Chemistry G. Ciamician, University of Bologna, via Selmi 2, 40126 Bologna, Italy.
authors.forename: Enrico
authors.initials: E
authors.lastname: Marchi
authors.forename: Massimo
authors.initials: M
authors.lastname: Baroncini
authors.forename: Giacomo
authors.initials: G
authors.lastname: Bergamini
authors.forename: Jeroen
authors.initials: J
authors.lastname: Van Heyst
authors.forename: Fritz
authors.initials: F
authors.lastname: Vögtle
authors.forename: Paola
authors.initials: P
authors.lastname: Ceroni