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Topic: Caesium fluoride

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	Caesium - Biocrawler (Site not responding. Last check: 2007-10-20)
		Caesium is also the most electropositive and most alkaline chemical element and also has the least ionization potential of all the elements, except for francium.
		caesium fluoride is widely used in organic chemistry as a base and as a source of anhydrous fluoride ion.
		The primary compounds of caesium are its chloride and its nitrate.
	www.biocrawler.com /encyclopedia/Cesium (892 words)

	ooBdoo
		Caesium fluoride is widely used in organic chemistry as a base and as a source of anhydrous fluoride ion.
		The primary compounds of caesium are caesium chloride and its nitrate.
		Caesium, being one of the heavier alkaline metals, is also one of the most reactive and is highly explosive when it comes in contact with water (even cold water, or ice).
	www.oobdoo.com /wikipedia/?title=Caesium (1307 words)

	Encyclopedia :: encyclopedia : Caesium fluoride (Site not responding. Last check: 2007-10-20)
		Caesium fluoride may be prepared by the action of hydrofluoric acid on caesium hydroxide or caesium carbonate, followed by removal of water.
		Caesium fluoride is a useful base in organic chemistry, due the fact that fluoride ion is largely unreactive as a nucleophile.
		Caesium fluoride is also a popular source of fluoride in organofluorine chemistry.
	www.hallencyclopedia.com /topic/Caesium_fluoride.html (540 words)

	loan Caesium - loan-reports.com (Site not responding. Last check: 2007-10-20)
		The primary compounds of caesium are caesium chloride and its nitrate.
		Caesium, being one of the heavier alkali metals, is also one of the most reactive and is highly explosive when it comes in contact with water (even cold water or ice).
		All caesium compounds should be regarded as mildly toxic because of its chemical similarity to potassium.
	www.loan-reports.com /Caesium (687 words)

	Caesium fluoride - Wikipedia, the free encyclopedia
		Caesium fluoride may be prepared by the action of hydrofluoric acid on caesium hydroxide or caesium carbonate, followed by removal of water.
		Caesium fluoride is a useful base in organic chemistry, due the fact that fluoride ion is largely unreactive as a nucleophile.
		Caesium fluoride is also a popular source of fluoride in organofluorine chemistry.
	en.wikipedia.org /wiki/Caesium_fluoride (626 words)

	Spartanburg SC \| GoUpstate.com \| Spartanburg Herald-Journal (Site not responding. Last check: 2007-10-20)
		Caesium is the second most electropositive and alkaline of the chemical elements and has the second lowest ionization potential (after francium).
		Caesium is used as a catalyst in the hydrogenation of certain organic compounds.
		Because of their high density, caesium chloride solutions are commonly used in molecular biology for density gradient ultracentrifugation, primarily for the isolation of viral particles, subcellular organelles and fractions, and nucleic acids from biological samples.
	www.goupstate.com /apps/pbcs.dll/section?category=NEWS&template=wiki&text=caesium (1348 words)

	Caesium
		Caesium (also spelled cesium; pronounced) is a chemical element in the periodic table that has the symbol Cs and atomic number 55.
		Caesium is also the most electropositive and most alkaline of the stable chemical elements and also has the lowest ionization potential of all the elements, except for francium.
		Caesium, being one of the heavier alkaline metals, is also one of the most reactive and is highly explosive in cold water.
	www.dejavu.org /cgi-bin/get.cgi?ver=93&url=http%3A%2F%2Farticles.gourt.com%2Fen%2Fcaesium (1152 words)

	Cesium - Chemistry with Mr. Olson (Site not responding. Last check: 2007-10-20)
		Caesium, gallium, and mercury are the only three metals that are liquid at or around room temperature.
		Caesium reacts explosively with cold water, and reacts with ice at temperatures above -116°C. Caesium hydroxide is a strong base and attacks glass.
		Caesium (cesium in USA) was discovered spectroscopically by Robert Wilhelm Bunsen and Gustav Robert Kirchhoff in 1860 in samples of mineral water from Durkheim.
	chem.wetpaint.com /page/Cesium/revision/14 (533 words)

	Caesium chloride at AllExperts
		Caesium chloride can be prepared by the reaction of caesium hydroxide or caesium carbonate with hydrochloric acid: the resulting salt is purified by recrystallization.
		Caesium metal reacts violently with chlorine gas to give caesium chloride, although the expense of metallic caesium means that this is not the usual route of preparation.
		Caesium chloride is used in the preparation of electrically conducting glasses.
	en.allexperts.com /e/c/ca/caesium_chloride.htm (382 words)

	Fluorine
		Fluorides are compounds that combine fluoride with some positively charged counterpart.
		Some other fluorides are often added to Toothpaste and, somewhat controversially, to municipal water supplies to prevent dental cavities.
		Fluorine in the form of fluorspar (Calcium fluoride) was described in 1529 by Georgius Agricola for its use as a flux, which is a substance that is used to promote the fusion of metals or minerals.
	www.ufaqs.com /wiki/en/fl/Fluorine.htm (995 words)

	Caesium
		Caesium is also the most Electropositive and most alkaline of the stable chemical elements and also has the least Ionization potential of all the elements, except for Francium.
		Because of their high density, Caesium chloride solutions are commonly used in molecular biology for density gradient ultracentrifugation, primarily for the isolation of nucleic acids from biological samples.
		Caesium, being one of the heavier alkaline metals, is highly explosive in cold water; and can even break the bath that it is being contained.
	www.ufaqs.com /wiki/en/ca/Caesium.htm (917 words)

	fluorine Information Center - fluorine element
		Fluorides the fluorine atom where is fluorine found of electron layers of fluorine are compounds that combine fluoride fluorine abundance with some fluorine compounds positively charged counterpart.
		Some other fluorides are often added to toothpaste and, somewhat controversially, to municipal water supplies to prevent dental cavities.
		Fluorine in the form of fluorspar (calcium fluoride) was described in 1529 by Georgius Agricola for its use as a flux, which is a substance that is used to promote the fusion of the fluorine molecule resonance raman fluorine metals or minerals.
	www.scipeeps.com /Sci-Chemistry_Topics_E_-_F/fluorine.html (1107 words)

	Preparation of perfluoroolefines - Patent 4016217
		The proportion of fluoride generally employed in the reaction is from 0.10 to 15% by weight of the tetrafluoroethylene.
		The fluoride should be dry and those that are insoluble are preferably in a finely divided state such as that produced by ball-milling.
		Dry caesium fluoride (5 g.), dry dimethylformamide (150 mls.) and.alpha.-pinene (0.10 g.) were ground in a ball mill for 12 hours.
	www.freepatentsonline.com /4016217.html (1973 words)

	Fluorine
		Compounds of fluorine, including sodium fluoride, are used in toothpaste to prevent dental cavities.
		These compounds are also added to municipal water supplies, a process called water fluoridation, though a combination of health concerns and urban legends has sometimes led to controversy.
		Fluorides have been used in the past to help molten metal flow, hence the name.
	www.dejavu.org /cgi-bin/get.cgi?ver=93&url=http%3A%2F%2Farticles.gourt.com%2Fen%2Ffluorine (1173 words)

	Caesium fluoride : search word
		It is therefore a useful, less hygroscopic alternative to tetra-n-butylammonium fluoride (TBAF) and TAS-fluoride when anhydrous "naked" fluoride ion is needed.
		(s) Being highly dissociated it is quite reactive as a fluoride source under anhydrous conditions too, and it will react with electron-deficient aryl chlorides to form aryl fluorides (halex reaction).
		Caesium fluoride in THF or DMF can attack a wide variety of organosilicon compounds to produce an organosilicon fluoride and a carbanion, which can then react with electrophiles
	www.searchword.org /ca/caesium-fluoride.html (897 words)

	Treatment of gas mixtures - Patent 6403047
		The method according to claim 1 in which the alkali metal fluoride is caesium fluoride, potassium fluoride, sodium fluoride or lithium fluoride or mixtures thereof.
		Of these caesium fluoride and potassium fluoride are preferred as they allow the method of the invention to be performed at the lower end of the temperature range.
		The caesium fluoride charge 13 was held in place in the reaction chamber by means of a carbon wool plug at the top and bottom (as shown) of the charge.
	www.freepatentsonline.com /6403047.html (1522 words)

	Process for the separation of hydrogen fluoride from its mixtures with a hydrofluoroalkane containing from 3 to 6 ...
		The mixture is placed in contact with a solution of alkali metal fluoride (in particular potassium or caesium fluoride) and the organic phase is separated from the phase containing the hydrogen fluoride and the alkali metal fluoride.
		Using this known process, there may be fear of contaminating the organic phase with the potassium or caesium fluoride and the risk of decomposing the hydrofluoroalkanes which this contamination might entail.
		To this end, the invention relates to a process for the separation of hydrogen fluoride from its mixtures with at least one hydrofluoroalkane containing from 3 to 6 carbon atoms, according to which the separation is carried out by extraction using at least one organic solvent.
	www.freepatentsonline.com /6294055.html (2548 words)

	Fluorine
		Fluorides are compounds that combine fluorine with some positively charged counterpart.
		Both elemental fluorine and fluoride ions are highly toxic and must be handled with great care and any contact with skin and eyes should be strictly avoided.
		When it is a free element, fluorine has a characteristic pungent odor that is detectable in concentrations as low as 20 nL/L. Its MAC-value is 1 1 µL/L. All equipment must be passivated before exposure to fluorine.
	www.danceage.com /biography/sdmc_Fluorine (1290 words)

	2002 Fluoride Abstracts. Part 2. Fluoride Action Network Pesticide Project.
		The fluoride concentration in the samples was found to lie in the range of 0.02 to 2.32 mg/L with a mean of 0.43 ± 0.40 mg/L. Surface water contained the lowest amount of fluoride with a mean of 0.14 ± 0.10 mg/L for 23 samples.
		It was observed that fluoride accumulation in plants could be averted through soil amendment by calcium treatment in the form of calcium carbonate thereby reducing the risk of human and livestock exposure to abnormal levels of fluoride through food chain other than protecting plants from getting affected.
		By region and district the mean fluoride concentration ranged from 0.12 ppm for rivers in Laikipia to 0.24 ppm for rivers in Nairobi, with 0.32 ppm in the Upper Basin of the Athi River.
	www.fluoridealert.org /pesticides/2002.f.part.2.abstracts.htm (10592 words)

	Engineering Database
		Caesium is a soft metal which is often liquid at room temperature due to its relatively low melting point (28.5°C).
		As with other alkaline group metals, caesium can be prepared by electrolysis of the fused halides but, in addition, it can also be prepared by heating the chloride with calcium and distilling out the molten metal.
		Caesium is also used in atomic clocks, a standard measure of time, based on the caesium ion resonance of 9,192,631,770 Hz.
	www.diracdelta.co.uk /science/source/c/a/caesium/source.html (191 words)

	Reference.com/Encyclopedia/Caesium
		Caesium (also spelled cesium, IPA: /ˈsiːziəm/) is a chemical element in the periodic table that has the symbol Cs and atomic number 55.
		Caesium is also the most electropositive and most alkaline of the stable chemical elements and has the second lowest ionization potential (francium being the lowest).
		Cesium nitrate is used as oxidiser to burn silicon in infrared flares like the LUU-19 flare, because it emits much of its light in the near infrared spectrum.
	www.reference.com /browse/wiki/Caesium (1357 words)

	KF/CH2X2/DMF - A Simple, High-Yield Methylenation of Catechols - [www.rhodium.ws]
		The reaction of a catechol with dihalogenomethane in DMF in the presence of an excess of potassium or caesium fluoride provides a high yield of the corresponding methylenedioxy compound in a relatively short period of time.
		On shaking anhydrous caesium fluoride (7.6 g, 0.05 mol) with a solution of catechol (1.1 g, 0.01 mol) in anhydrous DMF (30 g), the mixture became warm and the IR of the mixture showed a new strong broad band at ca 2500 cm
		Furthermore, it would seem that by using caesium fluoride and dichloromethane, intermolecular condensations may be kept to a minimum.
	www.erowid.org /archive/rhodium/chemistry/methylenation-kf-ch2x2.html (727 words)

	Suchmaschine (Site not responding. Last check: 2007-10-20)
		This colorless solid is an important source of caesium ions in a variety of applications.
		In Brazil such a source was stolen by scrap metal workers from a disused radiotherapy clinic, and serious injuries and deaths occurred as a result of external gamma exposure and internal exposure (the source was smashed open, releasing the water soluble caesium chloride).
		Caesium chloride (non radioactive) is also promoted as an alternative cancer therapy.
	www.dmoz.ch /lexikon.cgi?sprache=en&q=Caesium_chloride (439 words)

	Caesium - ToseekA Search Results
		Caesium reacts explosively with cold water, and reacts with ice...
		Caesium fluoride (cesium fluoride in North America), is an ionic compound...
		Caesium is the most electropositive and most alkaline element.
	www.toseeka.com /websearch/Caesium (209 words)

	caesium - OneLook Dictionary Search
		Caesium : Online Plain Text English Dictionary [home, info]
		Phrases that include caesium: caesium fluoride, caesium hydroxide, caesium perchlorate, caesium standard
		Words similar to caesium: cesium, cs, atomic number 55, more...
	www.onelook.com /?w=caesium&ls=a (208 words)

	[No title] (Site not responding. Last check: 2007-10-20)
		It is possible that, after the salt Cs+F− has formed, the Cs+ ion, which has the same electronic structure as elemental xenon, can like xenon be oxidised further by fluorine and form traces of a higher fluoride such as CsF3, analogous to XeF2.
		The high density of the caesium formate brine (up to 2.3 sg,) coupled with the relative benignity of 133Cs, reduces the requirement for toxic high-density suspended solids in the drilling fluid, which is a significant technological, engineering and environmental advantage.
		SI defines the second as 9,192,631,770 cycles of the radiation which corresponds to the transition between two electron spin energy levels of the ground state of the 133Cs atom.
	www.maxpedia.org /cgi-bin/mp/m.pl?s=1&sw=Caesium&la=en (340 words)

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