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What are the Molecules of Which the Samples of Metal Alkoxidesdo Really Consist ?

Published online by Cambridge University Press:  21 February 2011

N.Ya. Turova ,
N.I. Kozlova ,
E.P. Turevskaya ,
T.V. Rogova  and
V.G. Kessler
N.Ya. Turova
Affiliation:
The M.V.Lomonosov Moscow State University, 119899, Moscow, Russia
N.I. Kozlova
Affiliation:
The M.V.Lomonosov Moscow State University, 119899, Moscow, Russia
E.P. Turevskaya
Affiliation:
The M.V.Lomonosov Moscow State University, 119899, Moscow, Russia
T.V. Rogova
Affiliation:
The M.V.Lomonosov Moscow State University, 119899, Moscow, Russia
V.G. Kessler
Affiliation:
The M.V.Lomonosov Moscow State University, 119899, Moscow, Russia
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Abstract

On the basis of consideration of the properties of AI, In, Ln, Ti, Zr, Hf, NbO3+, MoO4+, WO4+, MoO22+ MO22+, Fe, Co, Ni alkoxide derivatives the main regularities inpoly- and oligomerization properties have been deduced:

1) The molecular complexity increases in time (aging) and on action ofalcohols. This process is followed by the increase in the melting andboiling points, decrease in solubility in ROH and weakening of colour. Inthe mass-spectra - in connection with the temperature of transition into thegas phase - increases the stability of products with lower molecular masses.2) oligomerization occurs on dissolution in aromatic hydrocarbons or on ashort thermal treatment (melting, distillation). The oligomerizationproducts possess lower thermal constants, higher solubility in ROH and moreintense colour. Their mass- spectra are containing the fragments of highermasses corresponding to oligomers existing apparently also in the condensedphase.

The mastering of these regularities permits the monitoring of molecularcomposition and thus physicochemical properties of the samples which are ofimportance for their technological application.

The presence of oxoalkoxides in the “M(OR)n” samples should be taken intoconsideration on the preparation of solutions used in the synthesis ofpowders and films of pure simple and mixed oxides.

Information

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 346: Symposium N – Better Ceramics Through Chemistry VI , 1994 , 261
Copyright
Copyright © Materials Research Society 1998

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References

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