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Topic: Selenides

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	SELENIUM - LoveToKnow Article on SELENIUM
		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.
	www.1911encyclopedia.org /S/SE/SELENIUM.htm (3483 words)

	Aminoalkyl phenyl selenides for the treatment of hypertension and nervous system dysfunctions - Patent 4722940
		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.
	www.freepatentsonline.com /4722940.html (2949 words)

	Phase relations among selenides, tellurides, and oxides; II, Applications to selenide-bearing ore deposits -- Simon et ...
		The stability fields of binary selenide minerals calculated thermodynamically relative to native elements, sulfide, telluride, and oxide minerals as a function of temperature have been used to characterize the genesis of selenide-bearing deposits.
		The actual mineralogy and the amount of selenide minerals that form from such an oxidizing fluid is a function of f (sub Se2(g)) and ultimately reflects the concentration of selenium in the fluid.
		A selenium-rich fluid alone can account for the presence of silver selenides in epithermal Au-Ag deposits, but both an oxidizing and a selenium-rich fluid is required to form the selenide mineral assemblages observed in telethermal selenide vein, unconformity-related, and sandstone-hosted uranium deposits.
	econgeol.geoscienceworld.org /cgi/content/abstract/92/4/468 (526 words)

	Reich Group Member: James Ringer (Site not responding. Last check: 2007-10-21)
		He found that a variety of activated selenides (propargyl, allyl and benzyl selenides, selenoketals) reacted smoothly with Me SnLi to formally replace the C-Se bond with C-Sn.
		This allowed use of the chemistry of metalated selenides to prepare stannanes.
		Since selenides are not normally good substrates for S
	www.chem.wisc.edu /areas/reich/group/students/Ringer.htm (166 words)

	Abstracts221-230
		Phenylaminoalkyl selenides were developed in the authors' laboratories as novel, selenium?based pharmacological agents.
		Biochemical studies established that as a consequence of the redox properties of their selenium moieties, these phenylaminoalkyl selenides possessed the remarkable property of propagating a cycle of turnover?dependent local depletion of reduced ascorbate when processed by the key enzyme of catecholamine metabolism, dopamine?beta?monooxygenase.
		On the basis of inductively coupled plasma/mass spectroscopic analyses, corroborated by operant behaviour and locomotor activity investigations, an orally?active phenylaminoalkyl selenide with restricted CNS permeability was successfully developed.
	www.lef.org /featured-articles/abstracts/abstracts221-230.html (1826 words)

	Orthorhombic rare earth Hf and Zr sulfides and selenides - United States Patent 3,956,461
		This invention relates to solid sulfides and selenides, and more particularly to such compounds containing one or more rare earth element and hafnium or zirconium.
		Ternary sulfides and selenides of the rare earths have been known for both the lanthanide and actinide series.
		Thus, the sulfides and selenides on the one hand, and the lanthanide and actinide rare earths on the other may be substituted for each other up to about ten percent, and such variations should be allowed within the scope of specific formulae.
	xrint.com /patents/us/3956461 (2697 words)

	Mineral - Wikipedia, the free encyclopedia
		Common sulfides include pyrite (iron sulfide - commonly known as fools' gold), chalcopyrite (copper iron sulfide) and galena (lead sulfide).
		The sulfide class also includes the selenides, the tellurides, the arsenides, the antimonides, the bismuthinides, and the sulfosalts (sulfur and a second anion such as arsenic).
		The phosphate mineral group actually includes any mineral with a tetrahedral unit AO where A can be phosphorus, antimony, arsenic or vanadium.
	en.wikipedia.org /wiki/Mineral (1395 words)

	Emne (Site not responding. Last check: 2007-10-21)
		The occurrence of gold and associated sulphides in low temperature carbonate bearing mineral veins from the Zillintoe gold deposit in southern China is studied.
		The description of new minerals, and additional information on known minerals are developed, focussing on crystal structure determination of selected synthetic sulphides, selenides and tellurides.
		C are developed for Cu-bearing sulphides, telurides, and selenides (Current focus: Cu-Fe-Se phase system) and platinum and metal sulphides and selenides (current focus: Pd-Cu-Fe-S and Pd-Cu-Se phase systems).
	www.dtu.dk /Inst/MR/Forskning/Topic.aspx?tid=85 (132 words)

	[No title] (Site not responding. Last check: 2007-10-21)
		Rhodobacter sphaeroides 2.4.1 is a naturally occurring bacterium that has been shown to be resistant to considerable concentrations of metalloid oxyanions and to convert selenium oxyanions into methyl selenides when grown under anaerobic conditions in the presence of incandescent light.
		Capillary gas chromatography coupled with fluorine-induced chemiluminescence detection was used to study the release of methyl selenides and methyl sulfides by Rhodobacter sphaeroides over the course of time, at varied pH, and at varied selenium oxyanion concentrations.
		However, the highest yields of reduced selenium found in dimethyl selenide and dimethyl diselenide per amount of selenium oxyanion added were found in cultures amended with 2 mM selenate and selenite.
	www.shsu.edu /~chm_tgc/publications/NewOrleans/VerenaNO.html (211 words)

	Berzelian Classification System
		The antimonides, arsenides, selenides, and tellurides closely resemble the sulfides in composition, while the chromates, molybdates and tungstates resemble the sulfates.
		In this case the mineral is classified as an antimonide, arsenide, selenide, or telluride.
		The sulfides, antimonides, arsenides, selenides, tellurides, and sulfosalts may be grouped according to the ratio of metal to nonmetal contained in their chemical formulae.
	dave.ucsc.edu /myrtreia/Berzelian_class.html (7720 words)

	Hydrogen Selenide - H2Se - is used to prepare metallis selenides and organoselenium compounds. It is also used in ...
		Hydrogen Selenide - H2Se - is used to prepare metallis selenides and organoselenium compounds.
		It is also used in doping gas mixtures for the preparation of semiconductor materials containing a controlled amount of significant impurity.
		Se - is used to prepare metallic selenides and organoselenium compounds.
	www.c-f-c.com /gaslink/pure/hydrogen-selenide.htm (84 words)

	Process for the preparation of diaryl sulphides and diaryl selenides - Patent 5026846
		According to the present invention, the aforesaid diaryl sulphides and diaryl selenides are prepared by reacting an aromatic compound of formula
		C., and isolating the diaryl sulphide or diaryl selenide obtained.
		The process according to the present invention allows aromatic sulphides or selenides to be obtained without the formation of hydrogen sulphide or hydrogen selenide, in very good yields and with high reaction speeds.
	www.freepatentsonline.com /5026846.html (1954 words)

	The Mineral Gallery - Sulfides Class
		As well as the Selenides, the Tellurides, the Antimonides, the Arsenides and the Sulfosalts.
		But, there are a few vitreous and transparent members such as realgar, cinnabar and orpiment that tend to break the mold, so to speak.
		Minerals belonging to the selenide, telluride, antimonide and arsenide subclasses have very similar properties to the more common sulfides and are thus included here.
	mineral.galleries.com /minerals/sulfides/class.htm (311 words)

	Reaction of Lithium Aluminum Hydride with Elemental Selenium: Its Application as a Selenating Reagent into Organic ... (Site not responding. Last check: 2007-10-21)
		observed the existence of unstable benzoyl selenide, which was obtained by the elimination of hydrogen selenide from selenobenzoic acid at room temperature.
		The benzoyl selenide was in turn transformed into dibenzoyl diselenide and bis(selenobenzoate).
		Both aromatic and aliphatic diacyl selenides 3 were obtained in excellent yields by using 2.
	pubs.acs.org /cgi-bin/jcen?jacsat/123/i34/html/ja005800o.html (1436 words)

	An Orally Active Selenium-Based Antihypertensive Agent with Restricted CNS Permeability -- May et al. 283 (2): 470 -- ...
		-methyl-phenyl-2-acetamidoethyl selenide was demethylated by the procedure of Grieco et al.
		Naive male ND/SW mice were used to evaluate the effects of selenide drugs on locomotor activity.
		-monooxygenase: Turnover-dependent cofactor depletion by phenyl aminoethyl selenide.
	jpet.aspetjournals.org /cgi/content/full/283/2/470 (4519 words)

	Limnology and Oceanography Abstracts (Site not responding. Last check: 2007-10-21)
		As a consequence, the rate of Se incorporation into food webs or its role as either a limiting nutrient or a toxic substance is a function of complex biogeochemistry.
		In particular, little is understood about the accumulation of dissolved organic selenides by phyto- or bacterioplankton.
		Consequently, uptake of organic selenides by phytoplankton may need to be considered in models predicting Se incorporation into aquatic food webs, given that it is a significant fraction of dissolved Se in estuarine and oceanic waters.
	aslo.org /lo/toc/vol_46/issue_8/1936.html (250 words)

	UPTAKE OF DISSOLVED SELENIUM BY PHYTOPLANKTON: IS ORGANIC SELENIUM READILY INCORPORATED AND DO UPTAKE RATES DIFFER ... (Site not responding. Last check: 2007-10-21)
		Phytoplankton were grown for 4-5 days in seawater enriched with varying concentrations of either 75-Se labelled filtered lysate of diatom cells, sodium selenite, or sodium selenate.
		Selenate incorporation by cells was insignificant compared to that of selenite and organic selenides.
		The bioavailability of organic selenides was similar in magnitude to the availability of selenite for 5 different taxa.
	aslo.org /santafe99/abstracts/SS28FR0215S.html (248 words)

	Dear friends of COM,
		The persons responsible for organizing working groups are: 1) selenides Werner Paar, 2) tellurides Kari Kojonen, 3) sulphosalts Nigel Cook and Yves Moelo.
		The classification of selenides and sulphosalts has been practically completed, but nevertheless requires some updating.
		SYMPOSIUM G15 'Mineralogy' session on 'Telluride and selenide minerals related to gold and platinum group element deposits'.
	www.gsf.fi /domestic/com/comnews1.htm (508 words)

	Publications de Willy DUMONT
		Synthesis of primary-alkyl selenols and selenides from primary-alkyl thiols involving diphenyl sulfonium salts, in Chemical Communication, volume 16, pp.
		Stereochemical outcome of Benzyllithiums Synthesis from Selenides, in Tetrahedron Lett.
		New Regiospecific Routes to Olefins from beta-Hydroxy Selenides: -a Stereospecific Deoxygenation of Epoxides; -a [C,C] Connective Route to Olefins, in Tetrahedron Lett.
	www.fundp.ac.be /recherche/personnes/publications/fr/01000438.html (1251 words)

	Abstract of Van Fleet-Stalder Industrial Microbiology and Biotechnology Paper (Site not responding. Last check: 2007-10-21)
		Total amounts of dimethyl selenide, dimethyl diselenide, dimethyl sulfide and dimethyl disulfide in culture medium and headspace were determined.
		Only small amounts of selenite were volatilized; meanwhile high amounts of methylated selenides were found in selenate poisoned cultures.
		The highest amounts of dimethyl selenide were found in the headspace above cultures amended with 6 to 10 mM selenate; the highest yield of 0.16% (selenium contained in dimethyl selenide and dimethyl diselenide) occurred when the cultures were amended with 6 mM selenate.
	www.shsu.edu /~chm_tgc/publications/JIMB/jimb.html (449 words)

	Mineral -- Facts, Info, and Encyclopedia article (Site not responding. Last check: 2007-10-21)
		Common sulfides include pyrite (iron sulfide - commonly known as fools' gold), (A yellow copper ore (CuFeS2) made up of copper-iron sulfide) chalcopyrite (copper iron sulfide) and galena (lead sulfide).
		The sulfide class also includes the selenides, the (Any binary compound of tellurium with other more electropositive elements) tellurides, the arsenides, the antimonides, the bismuthinides, and the sulfosalts (sulfur and a second anion such as arsenic).
		By far the most common phosphate is (A common complex mineral consisting of calcium fluoride phosphate or calcium chloride phosphate; a source of phosphorus) apatite which is an important (Click link for more info and facts about biological) biological mineral found in teeth and bones of many animals.
	www.absoluteastronomy.com /encyclopedia/m/mi/mineral.htm (1695 words)

	Research Publications (Site not responding. Last check: 2007-10-21)
		I completed all the research for this publication under the guidance of my supervisor, professor Thomas Back, and was responsible for writing the Experimental Section.
		I completed all the research for this publication under the guidance of my supervisor, professor Thomas Back, and was responsible for writing the Experimental Section and putting together the Supporting Information.
		I completed all the research for this poster under the guidance of my supervisor, professor Thomas Back, and was responsible for making the poster.
	www.chem.tamu.edu /rgroup/romo/web/publicationsziad.html (528 words)

	EPSRC Web Site - Grants on the Web
		Our aim is to develop efficient methods for the formation of transient nitrile selenides, and to explore the fundamental chemistry of this uncharted functional group.
		We are not aware of any systematic attempts to generate nitrile selenides.
		The precedent in studying heteroatoms in unusual valence states is that new and unexpected reactions will be uncovered.
	gow.epsrc.ac.uk /ViewGrant.aspx?Grant=GR/L25714/01&bannerlink=Programme%20support (175 words)

	Freshwater Bacteria Can Methylate Selenium through the Thiopurine Methyltransferase Pathway -- Ranjard et al. 69 (7): ...
		selenide (DMSe) and, at a lesser extent, dimethyl diselenide
		selenides was directly related to expression of the bTPMT (25).
		Kinetics of the atmospherically important reactions of dimethyl selenide.
	aem.asm.org /cgi/content/full/69/7/3784 (3827 words)

	Indium (III) selenide (Site not responding. Last check: 2007-10-21)
		A leading manufacturer of research chemicals, metals and materials including high purity inorganics, organics and organometallics, precious compounds and catalysts, rare earth compounds and metals, labware and more.
		Mercury Gallium Sulfide, HgGa2S4 Mercury Indium Selenide, HgIn2Se4 Mercury Indium Telluride, Hg5In2Te8 Mercury Selenide, HgSe (Tiemannite) Mercury Sulfide, HgS...
		Copper Germanium Telluride, Cu2GeTe3 Copper Indium Selenide, CuInSe2 Copper Indium Sulfide, CuInS2 Copper Indium Telluride, CuInTe2 Copper Iodide, CuI...
	www.chemindustry.net /chemnames/I/Indium_(III)_selenide.html (344 words)

	Final Report GR/H32001 (Site not responding. Last check: 2007-10-21)
		c) To assess the use of the sulfides and selenides prepared as battery cathode materials.
		New binary transition metal sulfides and selenides have been prepared by the reaction of transition metal carbonyls with sulfur or selenium in organic solvents at moderate temperatures (<200
		Powder X-ray diffraction confirmed that the new sulfides and selenides were amorphous.
	www.chem.rdg.ac.uk /dept/publications/GR/h32001.html (442 words)

	Selenide - Enpsychlopedia (Site not responding. Last check: 2007-10-21)
		The selenide ion is Se selenide is a chemical compound in which selenium serves as a anion with oxidation number of -2, much as sulfur does in a sulfide.
		The chemistry of the selenides parallels that of the sulfides.
		Similar to sulfide, for an aqueous solution, selenide ion, Se, is prevalent only in very basic conditions.
	psychcentral.com /wiki/Selenide (149 words)

	Energy Citations Database (ECD) - Energy and Energy-Related Bibliographic Citations (Site not responding. Last check: 2007-10-21)
		The uranium polyselenide USe/sub 3/ can be prepared by reaction of UCl/sub 4/ and Se in the presence of hydrogen, reaction of metallic uranium filings with H/sub 2/Se, and reaction of US/sub 2/ with H/sub 2/Se.
		All the other selenides are prepared by successive elimination of the selenium by treatment under vacuum in a temperature range from 500 to 1500 deg C. A hydrogen current can also be used to eliminate the selenium.
		The crystallographic data and the densities of these compounds are tabulated.
	www.osti.gov /energycitations/product.biblio.jsp?osti_id=4051158 (237 words)

	Reich Group Member: Flora Chow (Site not responding. Last check: 2007-10-21)
		The reaction conditions she developed for this reaction (methanesulfonyl chloride-triethylamine) continue to be the preferred ones in use today.
		Conversion of beta-Hydroxy Selenides to Olefins," H. Reich and F. Chow, J.
		Preparation of alpha-Lithio Selenides and Application to the Synthesis of Olefins by Reductive Elimination of beta-Hydroxy Selenides and Selenoxide Syn Elimination," H. Reich, F. Chow and S. Shah, J.
	www.chem.wisc.edu /areas/reich/group/students/Chow.htm (215 words)

	DR. BROMBA INFRAROTINDIKATOREN: Literatur
		Primak, W.; Osterheld, R.K.; Ward, R. "The Function of Fluxes in the Preparation of Infrared Sensitive Phosphors of the Alkaline Earth Sulfides and Selenides"; J.
		Smith, A.L.; Rosenstein, R.D.; Ward, R. "The Preparation of Strontium Selenide and its Properties as a Base Material for Phosphors Stimulated by Infrared"; J.
		Ward, R. "Infrared-Sensitive Phosphors of the Alkaline Earth Sulfides and Selenides"; J.
	www.bromba.com /indicard/irilitd.htm (578 words)

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