Redox-active silica nanoparticles. Part 1. Electrochemistry and catalytic activity of spherical, nonporous silica particles with nanometric diameters and covalently bound redox-active modifications.
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.
Budny
Anna
A
Institut für Organische Chemie and Institut für Anorganische Chemie, Universität Tübingen, Auf der Morgenstelle 18, 72076 Tübingen, Germany.
Novak
Filip
F
Plumeré
Nicolas
N
Schetter
Bernd
B
Speiser
Bernd
B
Straub
Diana
D
Mayer
Hermann A
HA
Reginek
Michaela
M
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
D009942:Organometallic Compounds; D010984:Platinum; D012822:Silicon Dioxide; D012428:Ruthenium