Bimetallic alkoxides of tungsten (VI)
The reactions of W(OR)/sub 6/ (I), WO(OR)/sub 4/ (II), and WO/sub 2/(OR)/sub 2/ with NaOR (R = Et) have been studied with the aid of conductometric titrations. The titration curves of II and III have end-points at an Na:W ratio equal to 1:1, and in the latter case, complexation takes place with time. The solubility in the NaOR-WO(OR)/sub 4/-ROH (I) and Bi(OR)/sub 3/-WO(OR)/sub 3/-ROH (II) systems at 25/sup 0/C has been studied. The formation of the crystalline complex NaWO(OR)/sub 5/ (IV), which is highly soluble in ethanol (approx. 40%) and has T/sub m/ = 70-80/sup 0/C, has been discovered in system I. In system II there are crystallization branches of the components and a homogeneous region between the 3:2 and 1:1 compositions. According to the IR-spectroscopic data, the complexation process of II is accompanied by cleavage of the W...O...W. bridges. A set of interplanar distances has been presented for complex IV. In contrast to the case of nonvolatile WO/sub 2/(OR)/sub 2/, following the thermolysis of NaWO/sub 2/(OR)/sub 3/, fragmentation products of W(OR)/sub 6/, which apparently form as a result of disproportionation of the complex, have been detected mass-spectrometrically in the gaseous phase.
- Research Organization:
- M. V. Lomonosov Moscow State Univ. (USSR)
- OSTI ID:
- 6945393
- Journal Information:
- Sov. J. Coordinat. Chem.; (United States), Journal Name: Sov. J. Coordinat. Chem.; (United States) Vol. 13:8; ISSN SJCCD
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
360602 -- Other Materials-- Structure & Phase Studies
37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY
400201* -- Chemical & Physicochemical Properties
ALKALI METAL COMPLEXES
ALKOXIDES
AMORPHOUS STATE
CHEMICAL REACTION KINETICS
COHERENT SCATTERING
COMPLEXES
COMPLEXOMETRY
CRYSTAL STRUCTURE
CRYSTALLIZATION
DIFFRACTION
INFRARED SPECTRA
KINETICS
ORDER PARAMETERS
ORGANIC SOLVENTS
PHASE TRANSFORMATIONS
QUANTITY RATIO
REACTION KINETICS
SCATTERING
SODIUM COMPLEXES
SOLUBILITY
SOLVENTS
SPECTRA
SPECTRAL SHIFT
SYNTHESIS
TITRATION
TRANSITION ELEMENT COMPLEXES
TUNGSTEN COMPLEXES
X-RAY DIFFRACTION