title: Redox-active silica nanoparticles. Part 1. Electrochemistry and catalytic activity of spherical, nonporous silica particles with nanometric diameters and covalently bound redox-active modifications.
abstract: Nonporous spherical silica nanoparticles resulting from a controlled Stöber process are covalently surface modified with redox-active molecules. Ferrocene, a ruthenium(II) complex with an N2P2Cl2 ligand set, and a sterically hindered biphenylamine are used as modifiers. The resulting materials are characterized by physical, spectroscopic, electrochemical, and chemical methods. The cyclic voltammetric behavior is studied in detail and reveals effects of charge transport by electron hopping along the surface of particles adsorbed on a Pt electrode. The ruthenium(II) complex remains catalytically active with respect to hydrogenation upon immobilization on the particles. Thus, the respective material provides a heterogenized homogeneous hydrogenation catalyst on a solid support.
authors.affiliation: Institut für Organische Chemie and Institut für Anorganische Chemie, Universität Tübingen, Auf der Morgenstelle 18, 72076 Tübingen, Germany.
authors.forename: Anna
authors.initials: A
authors.lastname: Budny
authors.forename: Filip
authors.initials: F
authors.lastname: Novak
authors.forename: Nicolas
authors.initials: N
authors.lastname: Plumeré
authors.forename: Bernd
authors.initials: B
authors.lastname: Schetter
authors.forename: Bernd
authors.initials: B
authors.lastname: Speiser
authors.forename: Diana
authors.initials: D
authors.lastname: Straub
authors.forename: Hermann A
authors.initials: HA
authors.lastname: Mayer
authors.forename: Michaela
authors.initials: M
authors.lastname: Reginek
mesh_terms: D000327:Adsorption; D002384:Catalysis; D004563:Electrochemistry; D004566:Electrodes; D015394:Molecular Structure; D053758:Nanoparticles / Q000737:chemistry*; D009942:Organometallic Compounds / Q000737:chemistry*; D010084:Oxidation-Reduction; D010316:Particle Size; D010984:Platinum / Q000737:chemistry; D016062:Porosity; D012428:Ruthenium / Q000737:chemistry*; D012822:Silicon Dioxide / Q000737:chemistry*; D013499:Surface Properties
chemical_list: D009942:Organometallic Compounds; D010984:Platinum; D012822:Silicon Dioxide; D012428:Ruthenium