Big Chemical Encyclopedia

Chemical substances, components, reactions, process design ...

Articles Figures Tables About

Selenide, aluminum

Growth of single crystals. Crystals of the aluminum selenide halides (needles, maximum length 15 mm) were grown by vapor transport in sealed ampoules between two temperatures (380 and 320°C for Al-SeCl, and 350 and 300°C for AlSeBr and AlSel) over a period of two months. A large excess of the halogenide was used (266). [Pg.383]

Zinc sulfide, ZnS, sphalerite (zinc blende) zinc sulfide, ZnS, wurtzite zinc selenide, ZnSe zinc telluride, ZnTe, cubic zinc telluride, ZnTe, hexagonal zinc polonide, ZnPo zinc aluminum selenide, ZnAl2Se4 zinc indium selenide, ZnIn2Se4 zinc indium telluride, Znhi2Te4. [Pg.48]

A1P Aluminum phosphide, 4 23 Al2Ig Aluminum iodide, 4 117 Al2Se3 Aluminum selenide, 2 183, 184... [Pg.208]

In Older to avoid the handling of poisonous hydrogen selenide, two other useful syntheses have been devised. One method uses the reaction of aromatic nitriles with aluminum selenide in the presence of pyridine, triethylamine and water (Scheme 24), while the other is performed by the reaction of nitriles with selenium, carbon monoxide and water in the presence of triethylamine (Scheme 25). These methods are exceedingly convenient in terms of manipulation without the isolation of hydrogen selenide for the preparation of selenoamides. Using these methods, a variety of aromatic and heterocyclic selenoamides can be obtained from the corresponding nitriles in high yields. [Pg.477]

Advancements in the Hantzsch method have appeared in the literature since 1982. An improved synthesis of the aryl- and alkylselenoamide precursors by reaction of the nitrile with aluminum selenide <85JOC384> or NaHSe prepared in situ from NaBH4 and selenium <93S870> has been reported. In particular the latter method aids in the synthesis of 2-alkylselenazoles because of the instability... [Pg.504]

Some epidemiological studies report data from populations exposed to selenium in the food chain in areas with high selenium levels in soil. It is likely that selenite, selenate, and the selenium found in food and in dietary supplements comprise the majority of selenium compounds to which oral, off-site selenium exposures will occur at or near hazardous waste sites. Aside from the variation in effective dose, the health effects from exposure to selenate, selenite, and dietary selenium are not expected to differ greatly. However, oral exposures to many other compounds of selenium could occur (primarily through soil or edible plant ingestion) if those compounds were deposited at the site, or if local environmental conditions greatly favor transformation to those forms. Heavy metal selenides, aluminum selenide, tungsten diselenides, and cadmium selenide are used in industry and may end up in waste sites. [Pg.91]

Aluminum selenide (AI2Se3) Preparation of hydrogen selenide for semi-conductors... [Pg.239]

Diselenane (31) was first obtained in very low yield by the reaction of lithium selenide and bis(2-chlorodiethyl)selenide (30) in acetone (Equation (5)) <51JA1105>. A better approach is to heat a mixture of aluminum selenide and 1,2-dibromoethane at 80-140°C over some hours. Even using this method, the yield is only 10% <56JA5825>. [Pg.994]

Aluminum selenide (Al2Se3) Ammonium selenite[(NH4)2Se03] Cadmium selenide (CdSe)... [Pg.1369]

Aluminum selenide AljSe3 1302-82-6 290.84 yel-brown powder 960 3.437 reac HjO... [Pg.695]

Ans. The elements in Group VI require two electrons to complete their octets, but aluminum. Group III, must lose three electrons to complete its octet. The first three elements in Group VI are oxygen, O sulfur, S and selenium, Se. The compounds are AI2O3, aluminum oxide AI2S3, aluminum sulfide and Al2Se3, aluminum selenide. [Pg.73]


See other pages where Selenide, aluminum is mentioned: [Pg.332]    [Pg.24]    [Pg.44]    [Pg.44]    [Pg.48]    [Pg.48]    [Pg.49]    [Pg.332]    [Pg.224]    [Pg.216]    [Pg.257]    [Pg.13]    [Pg.297]    [Pg.815]    [Pg.263]    [Pg.59]    [Pg.761]    [Pg.72]    [Pg.1106]    [Pg.312]    [Pg.332]    [Pg.825]    [Pg.397]   
See also in sourсe #XX -- [ Pg.2 , Pg.183 ]

See also in sourсe #XX -- [ Pg.2 , Pg.183 , Pg.184 ]

See also in sourсe #XX -- [ Pg.2 , Pg.183 ]

See also in sourсe #XX -- [ Pg.2 , Pg.183 ]

See also in sourсe #XX -- [ Pg.2 , Pg.183 , Pg.184 ]

See also in sourсe #XX -- [ Pg.2 , Pg.183 ]

See also in sourсe #XX -- [ Pg.2 , Pg.183 , Pg.184 ]

See also in sourсe #XX -- [ Pg.2 , Pg.183 ]

See also in sourсe #XX -- [ Pg.2 , Pg.183 , Pg.184 ]

See also in sourсe #XX -- [ Pg.2 , Pg.183 , Pg.184 ]

See also in sourсe #XX -- [ Pg.2 , Pg.3 , Pg.7 ]




SEARCH



© 2024 chempedia.info