title: Superparamagnetic Luminescent MOF@Fe₃O₄/SiO₂ Composite Particles for Signal Augmentation by Magnetic Harvesting as Potential Water Detectors.
abstract: Herein, we present the generation of a novel complex particle system consisting of superparamagnetic Fe3O4/SiO2 composite microparticle cores, coated with luminescent metal-organic frameworks (MOFs) of the constitution (∞)(2)[Ln2Cl6(bipy)3]·2bipy (bipy = 4,4′-bipyridine) that was achieved by intriguing reaction conditions including mechanochemistry. The novel composites combine the properties of both constituents: superparamagnetism and luminescence. The magnetic properties can be exploited to magnetically collect the particles from dispersions in fluids and, by gathering them at one spot, to augment the luminescence originating from the MOF modification on the particles. The luminescence can be influenced by chemical compounds, e.g., by quenching observed for low concentrations of water. Thus, the new composite systems present an innovative concept of property combination that can be potentially used for the detection of water traces in organic solvents as a magnetically augmentable, luminescent water detector.
authors: Institute of Inorganic Chemistry, Julius-Maximilians-University Würzburg , Am Hubland, D97074 Würzburg, Germany.
authors: Tobias
authors: T
authors: Wehner
authors: Fraunhofer Institute for Silicate Research, ISC , Neunerplatz 2, D97082 Würzburg, Germany.|Chair of Chemical Technology of Materials Synthesis, Julius-Maximilians-University Würzburg , Röntgenring 11, D97070 Würzburg, Germany.
authors: Karl
authors: K
authors: Mandel
authors: Fraunhofer Institute for Silicate Research, ISC , Neunerplatz 2, D97082 Würzburg, Germany.|Chair of Chemical Technology of Materials Synthesis, Julius-Maximilians-University Würzburg , Röntgenring 11, D97070 Würzburg, Germany.
authors: Michael
authors: M
authors: Schneider
authors: Fraunhofer Institute for Silicate Research, ISC , Neunerplatz 2, D97082 Würzburg, Germany.|Chair of Chemical Technology of Materials Synthesis, Julius-Maximilians-University Würzburg , Röntgenring 11, D97070 Würzburg, Germany.
authors: Gerhard
authors: G
authors: Sextl
authors: Institute of Inorganic Chemistry, Julius-Maximilians-University Würzburg , Am Hubland, D97074 Würzburg, Germany.
authors: Klaus
authors: K
authors: Müller-Buschbaum
keywords: composites; luminescence; magnetic particle detectors; metal organic frameworks (MOFs); superparamagnetism; water detectors