title: Switch-On Fluorescence of a Perylene-Dye-Functionalized Metal-Organic Framework through Postsynthetic Modification.
abstract: A perylene dye was introduced directly as a linker into a metal-organic framework (MOF) during synthesis. Depending on the dye concentration in the MOF synthesis mixture, different fluorescent materials were generated. The successful incorporation of the dye was proven by using (13) C and (27) Al MAS NMR spectroscopy, by solution NMR spectroscopy after digestion of the MOF sample, and by synthesizing a reference dye without connecting groups, which could coordinate on the metal-oxo cluster inside the MOF. Fluorescence quenching effects of the MOF linker, 2-aminoterephthalate, were observed and overcome by postsynthetic modification with acetic anhydride. We show here for the first time that amino groups, which can be used as anchoring points for covalent attachment of other molecules, are responsible for fluorescence quenching. Thus, a very promising strategy to implement switchable fluorescence into MOFs is shown here.
authors.affiliation: Department of Chemistry and Center for NanoScience (CeNS), University of Munich (LMU), Butenandtstrasse 11 (E), 81377 München (Germany).
authors.forename: Christian
authors.initials: C
authors.lastname: Dietl
authors.affiliation: Department of Chemistry and Center for NanoScience (CeNS), University of Munich (LMU), Butenandtstrasse 11 (E), 81377 München (Germany).
authors.forename: Henrik
authors.initials: H
authors.lastname: Hintz
authors.affiliation: Department of Chemistry and Center for NanoScience (CeNS), University of Munich (LMU), Butenandtstrasse 11 (E), 81377 München (Germany).
authors.forename: Bastian
authors.initials: B
authors.lastname: Rühle
authors.affiliation: Department of Chemistry/Biology, University of Siegen, Adolf-Reichwein-Straße 2, 57076 Siegen (Germany).
authors.forename: Jörn
authors.initials: J
authors.lastname: Schmedt Auf der Günne
authors.affiliation: Department of Chemistry and Center for NanoScience (CeNS), University of Munich (LMU), Butenandtstrasse 11 (E), 81377 München (Germany). Langhals@lrz.uni-muenchen.de.
authors.forename: Heinz
authors.initials: H
authors.lastname: Langhals
authors.affiliation: Department of Chemistry and Center for NanoScience (CeNS), University of Munich (LMU), Butenandtstrasse 11 (E), 81377 München (Germany). stefan.wuttke@cup.uni-muenchen.de.
authors.forename: Stefan
authors.initials: S
authors.lastname: Wuttke
keywords: NMR spectroscopy; dyes; fluorescence; metal-organic frameworks; synthetic methods