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H 2 Se adopts a bent structure with a H−Se−H bond angle of 91° [citation needed]. Consistent with this structure, three IR-active vibrational bands are observed: 2358, 2345, and 1034 cm −1. [6] The properties of H 2 S and H 2 Se are similar, although the selenide is more acidic with pK a = 3.89 and the second pK a = 11, [6] or 15.05 ± 0 ...
Se + Na[BH 4] → NaSeH + BH 3. Alternatively it can be made from sodium ethoxide exposed to hydrogen selenide: CH 3 CH 2 O − Na + + H 2 Se → NaSeH + CH 3 CH 2 OH. Sodium hydroselenide is not made for storage, instead it is used immediately after production in a fume hood thanks to the appalling odour of hydrogen selenide.
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100.029.067. Selenous acid (or selenious acid) is the chemical compound with the formula H2SeO3. Structurally, it is more accurately described by O=Se (OH)2. It is the principal oxoacid of selenium; the other being selenic acid .
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Selenic acid is the inorganic compound with the formula H 2 SeO 4. It is an oxoacid of selenium, and its structure is more accurately described as O 2 Se(OH) 2. It is a colorless compound. Although it has few uses, one of its salts, sodium selenate is used in the production of glass and animal feeds. [3]
Silver selenide has two crystal phases on the bulk phase diagram. At lower temperatures, it has an orthorhombic structure, β-Ag 2 Se. This orthorhombic phase, stable at room temperature, is a narrow-gap semiconductor, with space group P2 1 2 1 2 1. The exact size of the band gap has been given variously from 0.02 eV to 0.22 eV. [4]
Sodium sulfide is a chemical compound with the formula Na 2 S, or more commonly its hydrate Na 2 S·9H 2 O.Both the anhydrous and the hydrated salts in pure crystalline form are colorless solids, although technical grades of sodium sulfide are generally yellow to brick red owing to the presence of polysulfides and commonly supplied as a crystalline mass, in flake form, or as a fused solid.