Selenometalates

Mullay JJ (1987) Estimation of Atomic and Group Electronegativities. 66 1-25 Muller A, Baran E), Carter RO (1976) Vibrational Spectra of Oxo-, Thio-, and Selenometallates of Transition Elements in the Solid State. 26 81-139 Muller A, Diemann E, Jorgensen CK (1973) Electronic Spectra of Tetrahedral Oxo, Thio and Seleno Complexes. Formed by Elements of the Beginning of the Transition Groups. 14 23-47... 

Vibrational Spectra of Oxo-, Thio-, and Selenometallates of Transition Elements in the Solid State... 

The chalcogenometalates are prepared either by reactions in the solid state from the constituent elements themselves or by the reaction of H2S with an aqueous solution of the corresponding oxometalate. Several of the known thiometalates have only been isolated in pure form or detected in solution within the last 20 years. The preparation of selenometalates, and particularly that of the... 

For aspects of complex formation it is important to realize that thiometalates are not very stable in aqueous solution, especially at low pH. Their decomposition may be caused by hydrolysis to oxometalates, by intramolecular redox processes, or by their marked tendency to form sulfides. With molybdates and tungstates the stability decreases with increasing oxygen content and increasing electron density on the ligands. When they decompose in acid media, binary sulfides (or with selenometalates, selenides) such as MoS3 are formed. 

Thus, nanotubes of Mo and W diselenides have been prepared by the decomposition of the triselenide or the ammonium selenometallate at elevated temperatures under a flow of H2.22 Apart from the nanotubes, nanorods of WSe2 were also obtained. Some of the nanorods were attached to an amorphous particle at the tip (Fig. 11a). Several single-walled WSe2... 

Muller, A., Baran, E. J., Carter, R Vibrational Spectra of Oxo-, Thio-, and Selenometallates of Transition Elements in the Solid State. Vol. 26, pp. 81-139. 

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