Fluorine is the most reactive of all chemic elements in addition to calls for extremely careful handling. It is then aggressive that drinking glass laboratory instruments cannot resist it in addition to fifty-fifty bricks post away when exposed to fluorine gas. Yet elemental fluorine has numerous industrial applications including corrosion prevention or fuel tank diffusion barriers in addition to it is used for the production of sulphur hexafluoride, which serves equally insulating textile inwards high voltage switches.
Because of its extreme properties, until right away chemists were convinced that fluorine cannot occur inwards nature inwards its elemental form, merely entirely equally a fluoride ion, for illustration inwards minerals such equally fluorite (CaF2), too known equally fluorspar. Influenza A virus subtype H5N1 sure as shooting multifariousness of it, the so-called fetid fluorite or antozonite from the Maria mine inwards Woelsendorf inwards the Upper Palatinate, Germany, has been an object of tilt inwards scientific discipline for around 200 years. When crushed, it emits an unpleasant, pungent smell.
Influenza A virus subtype H5N1 issue of eminent chemists, amidst them Friedrich Woehler (1800-1882) in addition to Justus von Liebig (1803-1873), proposed diverse substances to explicate the odor. Over the years, scientists resorted to olfactory tests, chemic analyses in addition to complex majority spectrometer studies – coming to real dissimilar conclusions.
Next to elemental fluorine, substances similar iodine, ozone, phosphorus compounds, arsenic, sulphur, selenium, chlorine, hypochlorous acid in addition to hydrofluorocarbons were made responsible for the smell. Direct evidence that this fluorspar has inclusions of fluorine in addition to that the gas does non shape during crushing was lacking hitherto.
Now, finally, a squad led past times Dr Florian Kraus of the Technische Universitaet Muenchen in addition to Dr Joern Schmedt auf der Guenne of the Ludwig-Maximilians-University has succeeded inwards direct proving the presence of fluorine inwards antozonite beyond whatever doubt. Their results seem inwards a newspaper inwards the periodical Angewandte Chemie.
Using NMR spectroscopy, the scientists were able to position the fluorine in-situ in addition to thereby position an halt to the long discussions most the drive for the odor of stinking fluorspar.
“It is non surprising that chemists doubted the being of elemental fluorine inwards fetid fluorite,” the researchers said. “The fact that elemental fluorine in addition to calcium, which would commonly react amongst each other at once, are constitute hither adjacent is indeed difficult to believe.”
However, inwards the illustration of antozonite at that spot are real especial conditions: the elemental fluorine is generated through infinitesimal uranium inclusions inwards the mineral, which constantly emit ionizing radiations in addition to therefore divide the fluorite into calcium in addition to elemental fluorine.
The fluorine remains inwards infinitesimal inclusions, separated from the calcium past times the non-reactive fluorite in addition to therefore retains its elemental form. The ionizing radiations too leads to the formation of calcium clusters, which give antozonite its night color.
Bibliographic information: Jörn Schmedt auf der Günne, Martin Mangstl, Florian Kraus.. Occurrence of Difluorine F2 inwards Nature—In Situ Proof in addition to Quantification past times NMR Spectroscopy. Angewandte Chemie International Edition. Article kickoff published online: ; doi: 10.1002/anie.201203515