data processing formulas and observed and calculated structure factor amplitudes (18 pages). Ordering information is given on any current masthead page.
Metal alkoxides have great promise as oxide ceramic precursors. Direct manufacture from the metal and the alcohol permits the production of high purity materials and of those alkoxides which cannot be easily obtained by other routes. Examples which are of great interest to ceramics are the alkoxides of silicon, aluminum, magnesium and yttrium.Currently, only tetraethyl silicate is produced in large volumes by the direct route, employing a catalytic continuously fed process, yielding a distilled product. The reactivity of silicon, aluminum, magnesium and yttrium is governed by the metal surface state and activation and varies with different catalysts and alcohol chain length and branching.The major use of tetraethyl silicate is in partially hydrolyzed form as binder for precision casting molds and zinc-rich primer coatings. Judicious choice of alkoxide ligands allows the manufacture of soluble or liquid Si, Al, Mg, and Y derivatives. These are especially suitable for molecular doping and mixing in the manufacture of yttriastabilized zirconia, mullite, spinel, cordierite and other oxide ceramic precursors.
Die diamagnetischen Tetrakis‐[dithiophosphinatol‐dimolybdän‐Komplexe (II) werden wie aufgezeichnet synthetisiert und durch Elementaranalysen, schwingungs‐, UV/VIS‐ sowie 31P‐NMR‐spektroskopische Daten charakterisiert.
Triphenylboran bildet mit dem Ammoniumferrat (I) das luftempfindliche 1:1‐Addukt (II), für das mittels IR‐ und NMR‐spektroskopischer Untersuchungen und Vergleiche die Fe‐B‐Bindung und die negative Ladung am B‐Atom bestätigt werden.
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