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CAS No 7440-15-5 , rhenium

  • Name: rhenium
  • Synonyms: elementar; AG-G-95693; (186re)rhenium; Rhenium on alumina; Rhenium;rhenium; RE; ACMC-20ajsu; EINECS 231-124-5;7440-15-5;
  • CAS Registry Number:
  • Transport: UN 3178 4
  • Melting Point: 3180 °C(lit.)
  • Flash Point: °C
  • Boiling Point: 5596 °C(lit.)
  • Density: 21,04 g/cm3
  • Safety Statements: Low toxicity by ingestion. No reported cases of human toxicity. Experimentally, the Re3+ cation is more toxic than the ReO4− anion. Symptoms of Re3+ poisoning in rats are sedation, abdominal irritation, and death from cardiovascular collapse. Symptoms of ReO4− toxicity in rats include severe sedation and ataxia, tonic convulsions, and cardiovascular collapse. In cats, rhenium causes transient hypertension with tachycardia and transient auricular and ventricular fibrillations. In experimental animals, inhalation of rhenium dust causes pulmonary fibrosis.Radiation Hazard: Natural (63%) isotope 187Re, T1/2 = 4 × 1010 years, decays to stable 187Os by betas of less than 0.10 MeV. Flammable in the form of dust when exposed to heat or flame. Violent reaction with F2 @ 125°. Ignites in oxygen at 300°C. See also various rhenium compounds and RARE EARTHS.
  • Hazard Symbols: Flammable in powder form.
  • Flash Point: °C
  • EINECS: 231-124-5 /231-714-2
  • Molecular Weight: 186.207
  • InchiKey: WUAPFZMCVAUBPE-UHFFFAOYSA-N
  • InChI: InChI=1S/Re
  • Risk Statements: S24/25:Avoidcontactwithskinandeyes.;
  • Molecular Formula: Re
  • Molecular Structure:CAS No:7440-15-5 rhenium

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References of rhenium
Title: Rhenium
CAS Registry Number: 7440-15-5
Literature References: Re; at. wt 186.207; at. no. 75; valences 1-7; the heptavalent state is the most stable. Group VIIB(7). Two naturally occurring isotopes: 185 (37.07%); 187 (62.93%); the latter is radioactive, T? ~1011 years. Artificial, radioactive isotopes: 177-184; 186; 188-192. Occurs in gadolinite, molybdenite, columbite, rare earth minerals, and some sulfide ores. Average concn in earth's crust 1 ′ 10-9 (0.001 ppm). Discovered by Noddack et al., Naturwissenschaften 13, 567, 571 (1925). Prepn of metallic rhenium by reduction of potassium perrhenate or ammonium perrhenate: Hurd, Brim, Inorg. Synth. 1, 175 (1939). Prepn of high purity rhenium: Rosenbaum et al., J. Electrochem. Soc. 103, 518 (1956). Reviews: Melaven in Rare Metals Handbook, C. A. Hampel, Ed. (Reinhold, New York, 1954) pp 347-364; Peacock in Comprehensive Inorganic Chemistry vol. 3, J. C. Bailar, Jr. et al., Eds. (Pergamon Press, Oxford, 1973) pp 905-978; P. M. Treichel in Kirk-Othmer Encyclopedia of Chemical Technology vol. 20 (Wiley-Interscience, New York, 3rd ed., 1982) pp 249-258.
Properties: Hexagonal close-packed crystals, black to silver-gray. d 21.02. mp 3180°. bp 5900° (estimated). Specific heat 0-20° 0.03263 cal/g/°C. Specific electrical resistance: 0.21 ′ 10-4 ohm/cm at 20°. Brinell hardness: 250. Latent heat of vaporization 152 kcal/mol. Reacts with oxidizing acids, nitric and concd sulfuric; not with HCl.
Melting point: mp 3180°
Boiling point: bp 5900° (estimated)
Density: d 21.02
Use: Electron tube and semiconductor applications, in alloys for electrical contacts, as catalyst; possibly in high temp thermocouples and to improve the workability of tungsten and molybdenum alloys; plating jewelry, medical instruments, high vac equipment, mirror backings.