New perspectives in the tailoring of hetero (bi- and tri-) metallic alkoxide derivatives

Nanopartikuläre Funktionsmaterialien

“…[35] An dieser Stelle setzt das Methodenspektrum des "Nanowissenschaftlers" ein, um Reaktionen und Gleichgewichte im gewünschten Sinne zu steuern (Abbildung 11 [28] Über Flüssigphasensynthesen sind hochkristalline Farbpigmente über Polyol-vermittelte Synthese, durch Hydrothermalsynthese und nachfolgende Abtrennung der ligandenstabilisierten NPs mittels Phasentransfer oder durch Zersetzung von Einkomponentenvorstufen (single-source precursors) zugänglich (Abbildung 12). [42] Als Farbpigmente interessant sind auch Metall-NPs, deren Plasmonenresonanz in den sichtbaren Spektralbereich fällt (vgl. Abschnitt 2.2).…”

Molecular Encoding at the Nanoscale: From Complex Cubes to Bimetallic Oxides

“…[10][11][12][13][14][15][16] In most cases these heterometallic precursors are alkoxides and are thus very moisture sensitive. [17][18][19] Our goal is to identify a new precursor system that enables access to a large variety of nanoscaled bimetallic oxides, and at the same time is readily available and stable. One particular type of bimetallic oxide of current interest is metal oxide semiconductors (for instance ZnO) doped with paramagnetic metal ions like Mn 2+ and Ni 2+ .…”

Influence of Metal Fragment Mobility and Solution Dynamics on Cationic Rearrangements in Multimetallic Alkoxide Frameworks

“…Extensive investigations on the ligating flexibility of {Zr 2 (OPr i ) 9 } À unit had unveiled and enriched the diverse structural chemistry of metal alkoxides. [1,3,10] The extraordinary structural stability and rigidity (in solution) of the bioctahedral {M 2 (OR) 9 } À unit, also valid for other tetravalent metals (Ti, Hf, and Sn), [31,32] has played an important role in the development of polymetallic alkoxides, [13,31,[33][34][35] especially the use of heterobimetallic halo isopropoxides as building blocks for heterotrimetallic compounds. [13,31,34,35] In the context of Ce IV alkoxides, apart from the formation of [(m-OPr i )Ba{Ce 2 (OPr i ) 9 }] 2 [36] in solution, no report is available on the structural characterization of the {Ce 2 (OPr i ) 9 4 ], [37] [36] (thd = 2,2,6,6-tetramethylheptane-3,5-dione) contain appropriate assembling ligands in the metal coordination sphere.…”

“…[1][2][3][4][5][6][7][8][9] The preorganized metal À oxygen (alkoxy) bonds and the intrinsic reactivity against nucleophilic attack as well as the thermally labile nature of the organic periphery makes metal alkoxides ([M(OR) x ], [MM'(OR) x + y ]) as preferred starting materials for sol À gel and chemical vapor deposition processes. [2,[10][11][12][13][14][15][16] Metal-organic compounds in general enable low temperature processing of nanostructured oxides and their solid-solutions or composites that are challenging to obtain by traditional solid-state reactions. [10-13,17À21] Among functional metal oxides, cerium oxides are of potential importance both as monophasic material and particularly in conjunction with other metal oxides due to their reducible nature and oxygen capturing properties shown in solid-oxide fuel cells and high temperature sensor applications.…”