Alkoxides, preparation and properties

Komiya, S., Taneichi, S., Yamamoto, A., Yamamoto, T. Transition metal alkoxides. Preparation and properties of bis(aryloxy)iron(ll) and bis(alkoxy)iron(ll) complexes having 2,2 -bipyridine ligands. Bull. Chem. Soc. Jpn. 1980, 53, 673-679. 

H+, NOjl/HNOj redox couple, 33 103 Hafnium, see also specific compounds alkoxides, 26 295 bimetallics, 26 327-328 alkoxides of preparation and properties, 15 272-290... 

Table 108 Chromium(rV) Alkoxides and Amides Preparation and Properties...

The studies of chromium (III) alkoxides were initiated in the 1960s by Homuff [769] and by Bradley, who has even described isolation and characterization of Cr(TV) derivatives [30]. Quite a comprehensive investigation of the preparation and properties of chromium (II) alkoxides was carried out by Hor-... 

Preparation and properties of alkoxide halides of antimony(V) of the type (RO)nSbX5 n (n = 1-4) have been described in a number of publications24 -258. These compounds exist in dimeric form. The chloroantimony ethoxides, (EtO)nSbCl5 n, ionize in the solvents of high dielectric constants259,260 ... 

This article describes the basic chemical reactions involved in the sol gel synthesis of sohd materials using molecular alkoxide precursors and reviews recent advances in hybrid materials preparation and properties. 

Tetraazaporphyrin (3) (or porphyrazine) differs from Pc only in the absence of the four benzo units. The Q-band absorption of tetraporphyrins is found at shorter wavelengths ( 600 nm)69 and they are less prone to oxidation, which is advantageous for their use in catalysis. The cyclo-tetramerization of maleonitrile by the Linstead method, usually initiated by magnesium alkoxide, is by far the most important route to tetraazaporphyrins (Table l).70 The preparation and properties of substituted maleonitriles have been reviewed.71... 

Yamane M., Aso S., Okano S., Sakaino T. Low temperature synthesis of a monolithic silica glass by the hydrolysis of a silica gel. J. Mater. Sci. 1979 14 607-611 Yang J.-S., Sakka S., Yoko T., Kozuka H. Preparation of lithium aluminosilicate glass-ceramic monolith from metal-alkoxide solution. Part I. Preparation and properties ofprecursor gel monolith. J. Mater. Sci. 1990 25 1773-1778... 

Miyafuji, H., Saka, S. and Yamamoto, A. (1998). Si02-P205-B203 wood-inorganic composites prepared by metal alkoxides ohgomers and their fire-resisting properties. Holzforschung, 52(4), 410-416. 

In particular, we have chosen to have a close look at the synthesis and properties of ferroelectrics and related materials, where the sol-gel method with application ofmetal alkoxide precursors seems to have produced the most promising results. In most cases we have selected for discussion in this chapter those works on the preparation of complex oxides, emphasized that the chemistry of the precursors and its role for the properties of complex oxide phases. 

IR spectra measurements as well as variation of the film thickness, shrinkage, and refractive index demonstrated substantial differences in the mechanisms of thermal decomposition of films prepared from the exclusively metal alkoxide precursor and from the metal alkoxides modified by 2-ethylhexanoic acid. These differences affect the evolution of film microstructure and thus determine the different dielectric properties of the obtained films. The dielectric permittivity of the films prepared from metal alkoxide solutions was relatively low (about 100) and showed weak dependence ofthe bias field. This fact may be explained by the early formation of metal-oxide network (mostly in the... 

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