NationMaster - Encyclopedia: Selenide

A selenide is a chemical compound in which selenium serves as a anion with oxidation number of -2, much as sulfur does in a sulfide. General Name, Symbol, Number selenium, Se, 34 Series nonmetals Group, Period, Block 16 (VIA), 4, p Density, Hardness 4790 kg/m3(300K), 2 Appearance grey, metallic lustre Atomic properties Atomic weight 78. ... An anion is an ion with negative charge. ... The oxidation state or oxidation number is defined as the sum of negative and positive charges in an atom, which indirectly indicates the number of electrons it has accepted or donated. ... General Name, Symbol, Number sulfur, S, 16 Chemical series nonmetals Group, Period, Block 16, 3, p Appearance lemon yellow Atomic mass 32. ... In chemistry, a sulfide (sulphide in British and Canadian English) is a chemical compound or combination of sulfur with an oxidation number of -2, with another chemical element or a radical thereof. ...

Examples

hydrogen selenide, H₂Se
sodium selenide, Na₂Se

See category for a list. Hydrogen selenide, H2Se is a colorless gas with a melting point of -66oC and a boiling point of -42oC, and a density of 2120kg/m3 as a liquid. ...

Discussion

The chemistry of the selenides parallels that of the sulfides.

Similar to sulfide, for an aqueous solution, selenide ion, Se^2-, is prevalent only in very basic conditions. In neutral conditions, hydrogen selenide ion, HSe^-, is most common. In acid conditions, hydrogen selenide, H₂Se, is formed. Drinking water This article focuses on water as we experience it every day. ... An ion is an elementary particle or system of elementary particles with a net electric charge. ...

Categories: Inorganic compound stubs | Anions

Results from FactBites:

SELENIUM - LoveToKnow Article on SELENIUM (3483 words)
	It is occasionally found in the native condition, but more frequently in I combination with metals in the form of selenides, the more important seleniferous minerals being euchairite, crookesite, clausthalite, naumannite and zorgite.
	It combines directly with nitrogen, phosphorus, antimony and carbon, and with all the metals (except gold) to form selenides, of which those of the alkali and alkaline earth metals are soluble in water.
	Nitrogen selenide, N~Se2, is formed by the decomposition of selenium chloride with ammonia (A. Verneuil, Bull.

Aminoalkyl phenyl selenides for the treatment of hypertension and nervous system dysfunctions - Patent 4722940 (2949 words)
	The preparation of aminoalkyl phenyl selenides and pharmaceutically acceptable salts thereof is disclosed which are useful for the treatment of hypertension and related vascular diseases and the treatment of nervous system dysfunctions.
	In treating hypertension in mammals by the method of this invention, it may not be necessary to administer the aminoalkyl phenyl selenide in combination with a monoamine oxidase inhibitor, which would have the effect of prolonging life of the active compounds in the body.
	Using the standard substrate 2-phenylethylamine, the carbon analog 3-phenylpropylamine and the substrate phenyl-2-aminoethyl selenide of this invention with ascorbic acid as the electron donor, the values of k.sub.cat, and k.sub.cat /K.sub.m using 300 micrograms per milliliter of catalase were 48s.sup.-1 and 2.9.times.10.sup.3 M.sup.-1.sub.s.sup.-1, respectively.

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