This website uses cookies to improve your experience while you navigate through the website. Animation controls: Jmol.jmolLink(jmolApplet0,"anim mode once;delay 0.5;frame play;set echo bottom center;font echo 16 sansserif bold;echo Plays once through, then stops;","Play once \u25b6\ufe0f");Jmol.jmolBr() Fluoride may become incorporated into the tooth structure and make it more resistant to acidic dissolution. It is the arrangement of some of the more valuable precious metal tellurides and selenides among which is hessite (Ag 2 … But opting out of some of these cookies may have an effect on your browsing experience. Also in 2013, the Guardian published an article titled “Anti-fluoride activists should put their tinfoil hat theories to rest.” The author, Michael Vagg, did make the distinction between anti-fluoride activists with health and industry corruption concerns versus those who believe fluoride is a government mind control tactic. Related Structure… These cookies do not store any personal information. [3], https://en.wikipedia.org/w/index.php?title=Fluorite_structure&oldid=977347904, Creative Commons Attribution-ShareAlike License, This page was last edited on 8 September 2020, at 09:20. In solid state chemistry, the fluorite structure refers to a common motif for compounds with the formula MX2. Studies show that contrary to previously held beliefs, most of the effect of fluoride is topical and occurs after teeth have erupted into the mouth. Follow ChemTube3D on Kudos Display controls: Jmol.jmolLink(jmolApplet0,"select all;spacefill 100%; wireframe off;","Spacefill") In fact, the chemical structure of Fluoxetine (Prozac) is C 17 H 18 F 3 NO. Sodium fluoride has been commonly used as a rat poison in the past. …eight metal cations—is called the antifluorite structure. Many compounds, notably the common mineral fluorite (CaF 2), adopt this structure. Magnesium compounds such as Mg2X, where X can be one of the elements Si, Ge, Sn, or Pb, are said to have an antifluorite structure because the locations of the anions and cations are reversed relative to fluorite (an anti-structure); the anions occupy the FCC regular sites whereas the cations occupy the tetrahedral interstitial sites. [3], The fluorite structure of calcium fluoride CaF2. Many compounds, notably the common mineral fluorite (CaF2), adopt this structure. This category only includes cookies that ensures basic functionalities and security features of the website. This has important consequences in that the fluoride ion replaces the hydroxyl ion in the hydroxyapatite lattice and forms the more acid-resistant fluorapatite (Fig. Anions form the cubic close packing Again, the fluoride in that is present in much stronger concentrations than the fluoride found in tap water for example. Magnesium silicide, Mg2Si, has a lattice parameter of 6.338 Å with magnesium cations occupying the tetrahedral interstitial sites, in which each silicide anion is surrounded by eight magnesium cations and each magnesium cation is surrounded by four silicide anions in a tetrahedral fashion. Other elements — oxygen, hydrogen, nitrogen and carbon — make up more than 80 percent of this drug. while cations fill all tetrahedral holes. Jmol.jmolLink(jmolApplet0,"select all;spacefill off; wireframe .1;","Sticks") Fluoride has a secondary effect as well. Out of these cookies, the cookies that are categorized as necessary are stored on your browser as they are as essential for the working of basic functionalities of the website. Organic Chemistry Animations Introduction, Acid Chloride Formation – Thionyl Chloride, Acid chloride formation-Phosphorus Pentachloride, Addition to C=O - loss of carbonyl oxygen, Molecules with a Plane of Symmetry – Feist’s Acid, Chiral Allenes Without Stereogenic Centres, Conformations of ethane – Newman projection, Conformational Analysis – Pea Moth Pheromone, Substrate structure controls substitution mechanism S, E2 Regioselective Elimination to Menthenes A, E2 Regioselective Elimination to Menthenes B, Formation of Diazonium Salt – Diazotization, Benzyne formation – Diazotization-decarboxylation, Enolisation and formation of syn aldol product, Enolisation and formation of anti aldol product, Simple Diastereoselectivity - cis gives syn aldol, Simple Diastereoselectivity - trans gives anti aldol, Conjugate Addition of MeSH to an Unsaturated Aldehyde, Conjugate Addition of Diethylamine to an Unsaturated Nitrile (Acrylonitrile), Conjugate Addition of Diethylamine to an Unsaturated Ester, Conjugate Addition of Enamine to Unsaturated Imine, Conjugate addition of peroxide to form epoxides, Regioselectivity 2-methoxybuta-1,3-diene and acrylonitrile, Regioselectivity 1,1-dimethylbutadiene and methyl acrylate, Stereochemistry of the dienophile - diesters, Stereochemistry of the dienophile - dinitrile, The Woodward Hoffman description of the Diels-Alder, Intramolecular Diels-Alder (E)-3-Methyldeca-1,3,9-triene, Intramolecular Diels-Alder – 1,3,9-decatrien-8-one, 2,3-Dimethylbutadiene and Acrolein(propenal), Quinone as Dienophile – Steroid Framework, Intramolecular Diels-Alder – Regioselectivity reversal, 8-Phenylmenthol auxiliary-controlled Diels-Alder, Paal-Knorr pyrrole synthesis via hemiaminal, Pyridine N-Oxide – Nucleophilic Substitution, Pyridine N-Oxide – Remote Oxidation And Rearrangement, 1,3-Dipolar Cycloaddition Isoxazole from nitrile oxide, Electrocyclic reactions are stereospecific, Conrotatory ring closure/opening - cyclobutene, Disrotatory ring closure/opening - hextriene, Semipinacol rearrangements of diazonium salts, Rearrangements with different nucleophiles, Retention of stereochemistry can indicate neighbouring group participation, Neighbouring group participation: alpha-lactone formation, Fragmentations are controlled by stereochemistry, Controlled by stereochemistry (Cis isomer), Controlled by stereochemistry (Trans – Less severe interactions), Controlled by stereochemistry (Trans – Severe interactions), Fragmentation of diastereoisomers (Trans-decalin I), Fragmentation of diastereoisomers (No ring fragmentation), Photolysis of diazomethane to produce a carbene, Methylation of carboxylic acid using diazomethane, Cyclopropanation of an Alkene by a Carbenoid, Stereoselective Aldol Reaction – Cis gives Syn, Stereoselective Aldol Reaction - Trans gives Anti, Endo-trig reactions (5-endo-trig orbital overlap), Hydroboration (Addition of boron hydride to alkenes), Pd-Carbonylative Kosugi-Migita-Stille Coupling Reaction, Pd-Butenolide Formation From Carbonylation Of A Vinyl Bromide, Pd-catalysed nucleophilic allylic substitution of functionalised compounds, Hydroboration of cyclopentadiene Ipc-borane, Acetylenic Ketone Reduction – Alpine Borane, Intermolecular aldol -proline – hydroxyacetone, BISCO Bismuth Strontium Calcium Copper Oxide – BSCCO, Chalcogenides, Intercalation Compounds and Metal-rich phases, Compare shape and size of 1s, 2s and 2p orbitals, Orbital-orbital Interactions and Symmetry Adapted Linear Combinations, Distortions of a octahedral complex with chelating ligands, Ligand Substitution Square Planar Complex, Possible morphologies of Au Nanoparticles, Electrophilic Addition Addition of bromine to an alkene, Electrophilic addition to alkenes – Symmetrical and Unsymmetrical, Nucleophilic Addition Addition of Hydride, Cyanohydrin Formation – Nucleophilic addition to the carbonyl group, Nucleophilic Substitution at Saturated Carbon, Nucleophilic Substitution Cyanide + Ethyl Bromide, Elimination – E2 Stereoselective for E alkenes, Radical Reactions Synthesis of Chloroalkanes, Radical Reactions CFCs and the Ozone Layer, Polyvinyl Chloride Poly(chloroethene) PVC, Creative Commons Attribution-Noncommercial-Share Alike 2.0 UK: England & Wales License.