Aluminium selenide

From metallic selenides.—Aluminium selenide is easily decomposed, even by water, with formation of hydrogen selenide 6... 

The following derivatives are obtained by the interaction of aluminium selenide with the corresponding alcohols at 250° to 300° C. or with the ethers at 300° to 350° C. 2 Diethyl selenide, B.pt. about 110° C., diethyl diselenide, orange-yellow, B.pt. 137° C., M.pt. -90° to -98° C. and ethyl selenide di-isopropyl selenide, isopropyl selenide, B.pt. 70° to 75° C., and di-isopropyl diselenide. The presence of water in the alcohols or ethers does not seem to affect appreciably the purity of the final products. 

Treatment of the pyran 150 with aluminium selenide-hydrogen chloride under the same conditions afforded the selenopyran in 55% yield (Equation 59) <2002J(P2)1909>. 

Hydrogen selenide, made by decomposing aluminium selenide with water, is much less thermally stable than its sulphur analogue ... 

Glass formation and local structure in the related system P-Se-Al has also been studied by P and Al NMR which indicates that the local environments of both the P and Al are dominated by the selenium (Hudalla et al. 1998). Although there is evidence of interaction between the Al and P (the formation of four-coordinated P is facilitated by the presence of Al), a more quantitative assessment by Alp P) spin echo double resonance indicates that direct Al-Se-P links occur with less than statistical probability. These results suggest a glass structure which is partially segregated into phosphorus selenide and aluminium selenide-rich regions (Hudalla et al. 1998). 

The partial pressures of the species in gaseous aluminium-selenium mixtures were determined in the temperature range 1232 to 1352 K using mass spectrometry and Knud-sen effusion cells. The measured ion intensities were converted to partial pressures by normalising the ion intensity of Al(g) in equilibrium with Al(l) to the known total vapour pressure. The derived thermodynamic quantities were recalculated by the review using the selected thermodynamic properties of Se2(g), the CODATA [89COX/WAG] properties of Al(g), and the entropies and heat capacity expressions of the aluminium selenides given in Sections V.8.2.1.1 to V.8.2.1.3. The results are summarised in Table A-59. 

WAI/SHU] Waitkins, G. R., Shutt, R., Aluminium selenide and hydrogen selenide. Inorganic Synthesis, vol. II, Fernelius, W. C., Ed., pp.183-186, McGraw-Hill, New York, USA, (1946). Cited on page 131. 

AICI3 ALUMINIUM CHLORIDE 30 AI2Se3 ALUMINIUM SELENIDE 69... 

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