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Download as PDF; Printable version; In other projects ... move to sidebar hide. Selenium sulfide can refer to either of the following : Selenium disulfide, SeS 2 ...
Selenium in these reactions is almost always stereogenic, and the effect of epimerization at selenium (which is acid-catalyzed and occurs readily) on the elimination reaction is nearly unknown. In one example, separation and warming of selenoxides 1 and 2 revealed that 2 decomposes at 0 °C, while 1 , which presumably has more difficulty ...
A mnemonic is a memory aid used to improve long-term memory and make the process of consolidation easier. Many chemistry aspects, rules, names of compounds, sequences of elements, their reactivity, etc., can be easily and efficiently memorized with the help of mnemonics.
Selenium is found in metal sulfide ores, where it substitutes for sulfur. Commercially, selenium is produced as a byproduct in the refining of these ores. Minerals that are pure selenide or selenate compounds are rare. The chief commercial uses for selenium today are glassmaking and pigments. Selenium is a semiconductor and is used in photocells.
Selenium compounds are more nucleophilic than the corresponding sulfur compounds and also more acidic. The p K a values of XH 2 are 16 for oxygen, 7 for sulfur and 3.8 for selenium. In contrast to sulfoxides , the corresponding selenoxides are unstable in the presence of β-protons and this property is utilized in many organic reactions of ...
Salt-like hydride selenides may be formed by heating selenium with a metal hydride in an oxygen-free capsule. For rare earth elements, this method works as long as selenium has enough oxidising power to convert a +2 oxidation state to a +3 state. So for europium and ytterbium it does not work as the monoselenide is more stable. [1]
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Caesium selenide is an inorganic compound of caesium and selenium. It is a selenide, with the chemical formula of Cs 2 Se. It can be prepared by reacting caesium and selenium. It has an inverse fluorite structure, with space group ¯. There are 4 units per unit cell, [1] and the other selenides from the same group are similar