title: Reversible Photoisomerization of Spiropyran on the Surfaces of Au25 Nanoclusters.
abstract: Au25 nanoclusters functionalized with a spiropyran molecular switch are synthesized via a ligand-exchange reaction at low temperature. The resulting nanoclusters are characterized by optical and NMR spectroscopies as well as by mass spectrometry. Spiropyran bound to nanoclusters isomerizes in a reversible fashion when exposed to UV and visible light, and its properties are similar to those of free spiropyran molecules in solution. The reversible photoisomerization entails the modulation of fluorescence as well as the light-controlled self-assembly of nanoclusters.
authors.affiliation: Department of Organic Chemistry, Weizmann Institute of Science, Rehovot, 76100, Israel.
authors.forename: T
authors.initials: T
authors.lastname: Udayabhaskararao
authors.affiliation: Department of Organic Chemistry, Weizmann Institute of Science, Rehovot, 76100, Israel.
authors.forename: Pintu K
authors.initials: PK
authors.lastname: Kundu
authors.affiliation: Department of Organic Chemistry, Weizmann Institute of Science, Rehovot, 76100, Israel.
authors.forename: Johannes
authors.initials: J
authors.lastname: Ahrens
authors.affiliation: Department of Organic Chemistry, Weizmann Institute of Science, Rehovot, 76100, Israel. rafal.klajn@weizmann.ac.il.
authors.forename: Rafal
authors.initials: R
authors.lastname: Klajn
keywords: molecular switches; nanoclusters; photochromism; self-assembly; spiropyran