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What are the Molecules of Which the Samples of Metal Alkoxides do 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 in poly- and oligomerization properties have been deduced:

1) The molecular complexity increases in time (aging) and on action of alcohols. This process is followed by the increase in the melting and boiling points, decrease in solubility in ROH and weakening of colour. In the mass-spectra - in connection with the temperature of transition into the gas phase - increases the stability of products with lower molecular masses. 2) oligomerization occurs on dissolution in aromatic hydrocarbons or on a short thermal treatment (melting, distillation). The oligomerization products possess lower thermal constants, higher solubility in ROH and more intense colour. Their mass- spectra are containing the fragments of higher masses corresponding to oligomers existing apparently also in the condensed phase.

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

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

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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