関: Re

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a rare heavy polyvalent metallic element that resembles manganese chemically and is used in some alloys; is obtained as a by-product in refining molybdenum (同)Re, atomic number 75

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rheniumの化学記号

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出典(authority):フリー百科事典『ウィキペディア（Wikipedia）』「2015/08/16 00:11:48」(JST)

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Rhenium is a chemical element with symbol Re and atomic number 75. It is a silvery-white, heavy, third-row transition metal in group 7 of the periodic table. With an estimated average concentration of 1 part per billion (ppb), rhenium is one of the rarest elements in the Earth's crust. The free element has the third-highest melting point and highest boiling point of any element, at 5,869 K (10,105 °F). Rhenium resembles manganese and technetium chemically and is obtained as a by-product of molybdenum and copper ore's extraction and refinement. Rhenium shows in its compounds a wide variety of oxidation states ranging from −1 to +7.

Discovered in 1925, rhenium was the last stable element to be discovered. It was named after the river Rhine in Europe.

Nickel-based superalloys of rhenium are used in the combustion chambers, turbine blades, and exhaust nozzles of jet engines. These alloys contain up to 6% rhenium, making jet engine construction the largest single use for the element, with the chemical industry's catalytic uses being next-most important. Because of the low availability relative to demand, rhenium is among the most expensive of metals, with an average price of approximately US$2,750 per kilogram (US$85.53 per troy ounce) as of April 2015; it is also of critical strategic military importance, for its use in high performance military jet and rocket engines.^[3]

1 History
2 Characteristics
- 2.1 Isotopes
- 2.2 Compounds
  - 2.2.1 Halides and oxyhalides
  - 2.2.2 Oxides and sulfides
  - 2.2.3 Other compounds
  - 2.2.4 Organorhenium compounds
  - 2.2.5 Nonahydridorhenate
- 2.3 Occurrence
3 Production
4 Applications
- 4.1 Alloys
- 4.2 Catalysts
- 4.3 Other uses
5 Precautions
6 References
7 External links

History

Rhenium (Latin: Rhenus meaning: "Rhine")^[4] was the last-discovered of the elements that have a stable isotope (other new elements discovered in nature since then, such as neptunium and plutonium, are radioactive).^[5] The existence of a yet-undiscovered element at this position in the periodic table had been first predicted by Dmitry Mendeleev. Other calculated information was obtained by Henry Moseley in 1914.^[6] It is generally considered to have been discovered by Walter Noddack, Ida Tacke, and Otto Berg in Germany. In 1925 they reported that they had detected the element in platinum ore and in the mineral columbite. They also found rhenium in gadolinite and molybdenite.^[7] In 1928 they were able to extract 1 g of the element by processing 660 kg of molybdenite.^[8] It was estimated in 1968 that 75% of the rhenium metal in the United States was used for research and the development of refractory metal alloys. It took several years from that point before the superalloys became widely used.^[9]^[10]

In 1908, Japanese chemist Masataka Ogawa announced that he had discovered the 43rd element and named it nipponium (Np) after Japan (Nippon in Japanese). However, later analysis indicated the presence of rhenium (element 75), not element 43.^[11] The symbol Np was later used for the element neptunium.

Characteristics

Rhenium is a silvery-white metal with one of the highest melting points of all elements, exceeded by only tungsten and carbon. It also has the highest boiling point of all elements. It is also one of the densest, exceeded only by platinum, iridium and osmium. Rhenium has a hexagonal close-packed crystal structure, with lattice parameters a = 276.1 pm and c = 445.6 pm.^[12]

Its usual commercial form is a powder, but this element can be consolidated by pressing and sintering in a vacuum or hydrogen atmosphere. This procedure yields a compact solid having a density above 90% of the density of the metal. When annealed this metal is very ductile and can be bent, coiled, or rolled.^[13] Rhenium-molybdenum alloys are superconductive at 10 K; tungsten-rhenium alloys are also superconductive^[14] around 4–8 K, depending on the alloy. Rhenium metal superconducts at 1.697 ± 0.006 K.^[15] ^[16]

In bulk form and at room temperature and atmospheric pressure, the element resists alkalis, sulfuric acid, hydrochloric acid, dilute (but not concentrated) nitric acid, and aqua regia.

Isotopes

Rhenium has one stable isotope, rhenium-185, which nevertheless occurs in minority abundance, a situation found only in two other elements (indium and tellurium). Naturally occurring rhenium is 37.4% ¹⁸⁵Re, which is stable, and 62.6% ¹⁸⁷Re, which is unstable but has a very long half-life (≈10¹⁰ years). This lifetime can be greatly affected by the charge state of rhenium atom.^[17]^[18] The beta decay of ¹⁸⁷Re is used for rhenium-osmium dating of ores. The available energy for this beta decay (2.6 keV) is one of the lowest known among all radionuclides. The isotope rhenium-186m is notable as being one of the longest lived metastable isotopes with a half-life of around 200,000 years. There are twenty-five other recognized radioactive isotopes of rhenium.^[19]

Compounds

Rhenium compounds are known for all the oxidation states between −3 and +7 except −2. The oxidation states +7, +6, +4, and +2 are the most common.^[20] Rhenium is most available commercially as salts of perrhenate, including sodium and ammonium perrhenates. These are white, water-soluble compounds.^[21]

Halides and oxyhalides

The most common rhenium chlorides are ReCl₆, ReCl₅, ReCl₄, and ReCl₃.^[22] The structures of these compounds often feature extensive Re-Re bonding, which is characteristic of this metal in oxidation states lower than VII. Salts of [Re₂Cl₈]²⁻ feature a quadruple metal-metal bond. Although the highest rhenium chloride features Re(VI), fluorine gives the d⁰ Re(VII) derivative rhenium heptafluoride. Bromides and iodides of rhenium are also well known.

Like tungsten and molybdenum, with which it shares chemical similarities, rhenium forms a variety of oxyhalides. The oxychlorides are most common, and include ReOCl₄, ReOCl₃.

Oxides and sulfides

Perrhenic acid adopts an unconventional structure.

The most common oxide is the volatile colourless Re₂O₇. Rhenium trioxide ReO₃ adopts a perovskite-like structure. Other oxides include Re₂O₅, ReO₂, and Re₂O₃.^[22] The sulfides are ReS₂ and Re₂S₇. Perrhenate salts can be converted to tetrathioperrhenate by the action of ammonium hydrosulfide.^[23]

Other compounds

Rhenium diboride (ReB₂) is a hard compound having the hardness similar to that of tungsten carbide, silicon carbide, titanium diboride or zirconium diboride.^[24]

Organorhenium compounds

Dirhenium decacarbonyl is the most common entry to organorhenium chemistry. Its reduction with sodium amalgam gives Na[Re(CO)₅] with rhenium in the formal oxidation state −1.^[25] Dirhenium decacarbonyl can be oxidised with bromine to bromopentacarbonylrhenium(I):^[26]

Re₂(CO)₁₀ + Br₂ → 2 Re(CO)₅Br

Reduction of this pentacarbonyl with zinc and acetic acid gives pentacarbonylhydridorhenium:^[27]

Re(CO)₅Br + Zn + HOAc → Re(CO)₅H + ZnBr(OAc)

Methylrhenium trioxide ("MTO"), CH₃ReO₃ is a volatile, colourless solid has been used as a catalyst in some laboratory experiments. It can be prepared by many routes, a typical method is the reaction of Re₂O₇ and tetramethyltin:

Re₂O₇ + (CH₃)₄Sn → CH₃ReO₃ + (CH₃)₃SnOReO₃

Analogous alkyl and aryl derivatives are known. MTO catalyses for the oxidations with hydrogen peroxide. Terminal alkynes yield the corresponding acid or ester, internal alkynes yield diketones, and alkenes give epoxides. MTO also catalyses the conversion of aldehydes and diazoalkanes into an alkene.^[28]

Nonahydridorhenate

Structure of ReH2−

9.

A distinctive derivative of rhenium is nonahydridorhenate, originally thought to be the rhenide anion, Re⁻, but actually containing the ReH2−
9 anion in which the oxidation state of rhenium is +7.

Occurrence

Molybdenite

Rhenium is one of the rarest elements in Earth's crust with an average concentration of 1 ppb;^[22] other sources quote the number of 0.5 ppb making it the 77th most abundant element in Earth's crust.^[29] Rhenium is probably not found free in nature (its possible natural occurrence is uncertain), but occurs in amounts up to 0.2%^[22] in the mineral molybdenite (which is primarily molybdenum disulfide), the major commercial source, although single molybdenite samples with up to 1.88% have been found.^[30] Chile has the world's largest rhenium reserves, part of the copper ore deposits, and was the leading producer as of 2005.^[31] It was only recently that the first rhenium mineral was found and described (in 1994), a rhenium sulfide mineral (ReS₂) condensing from a fumarole on Russia's Kudriavy volcano, Iturup island, in the Kurile Islands.^[32] Kudryavy discharges up to 20–60 kg rhenium per year mostly in the form of rhenium disulfide.^[33]^[34] Named rheniite, this rare mineral commands high prices among collectors.^[35]

Production

Ammonium perrhenate

Commercial rhenium is extracted from molybdenum roaster-flue gas obtained from copper-sulfide ores. Some molybdenum ores contain 0.001% to 0.2% rhenium.^[22]^[30] Rhenium(VII) oxide and perrhenic acid readily dissolve in water; they are leached from flue dusts and gasses and extracted by precipitating with potassium or ammonium chloride as the perrhenate salts, and purified by recrystallization.^[22] Total world production is between 40 and 50 tons/year; the main producers are in Chile, the United States, Peru, and Poland.^[36] Recycling of used Pt-Re catalyst and special alloys allow the recovery of another 10 tons per year. Prices for the metal rose rapidly in early 2008, from $1000–$2000 per kg in 2003–2006 to over $10,000 in February 2008.^[37]^[38] The metal form is prepared by reducing ammonium perrhenate with hydrogen at high temperatures:^[21]

2 NH₄ReO₄ + 7 H₂ → 2 Re + 8 H₂O + 2 NH₃

Applications

The Pratt & Whitney F-100 engine uses rhenium-containing second-generation superalloys

Rhenium is added to high-temperature superalloys that are used to make jet engine parts, using 70% of the worldwide rhenium production.^[39] Another major application is in platinum–rhenium catalysts, which are primarily used in making lead-free, high-octane gasoline.^[40]

Alloys

The nickel-based superalloys have improved creep strength with the addition of rhenium. The alloys normally contain 3% or 6% of rhenium.^[41] Second-generation alloys contain 3%; these alloys were used in the engines of the F-16 and F-15, whereas the newer single-crystal third-generation alloys contain 6% of rhenium; they are used in the F-22 and F-35 engines.^[40]^[42] Rhenium is also used in the superalloys, such as CMSX-4 (2nd gen) and CMSX-10 (3rd gen) that are used in industrial gas turbine engines like the GE 7FA. Rhenium can cause superalloys to become microstructurally unstable, forming undesirable TCP (topologically close packed) phases. In 4th- and 5th-generation superalloys, ruthenium is used to avoid this effect. Among others the new superalloys are EPM-102 (with 3% Ru) and TMS-162 (with 6% Ru), ^[43] as well as TMS-138^[44] and TMS-174.^[45]^[46]

CFM International CFM56 jet engine still with blades made with 3% rhenium

For 2006, the consumption is given as 28% for General Electric, 28% Rolls-Royce plc and 12% Pratt & Whitney, all for superalloys, whereas the use for catalysts only accounts for 14% and the remaining applications use 18%.^[39] In 2006, 77% of the rhenium consumption in the United States was in alloys.^[40] The rising demand for military jet engines and the constant supply made it necessary to develop superalloys with a lower rhenium content. For example the newer CFM International CFM56 high-pressure turbine (HPT) blades will use Rene N515 with a rhenium content of 1.5% instead of Rene N5 with 3%.^[47]^[48]

Rhenium improves the properties of tungsten. Tungsten-rhenium alloys are more ductile at low temperature, allowing them to be more easily machined. The high-temperature stability is also improved. The effect increases with the rhenium concentration, and therefore tungsten alloys are produced with up to 27% of Re, which is the solubility limit.^[49] One application for the tungsten-rhenium alloys is X-ray sources. The high melting point of both compounds, together with the high atomic mass, makes them stable against the prolonged electron impact.^[50] Rhenium tungsten alloys are also applied as thermocouples to measure temperatures up to 2200 °C.^[51]

The high temperature stability, low vapor pressure, good wear resistance and ability to withstand arc corrosion of rhenium are useful in self-cleaning electrical contacts. In particular, the discharge occurring during the switching oxidizes the contacts. However, rhenium oxide Re₂O₇ has poor stability (sublimes at ~360 °C) and therefore is removed during the discharge.^[39]

Rhenium has a high melting point and a low vapor pressure similar to tantalum and tungsten. Therefore, rhenium filaments exhibit a higher stability if the filament is operated not in vacuum, but in oxygen-containing atmosphere.^[52] Those filaments are widely used in mass spectrometers, in ion gauges^[53] and in photoflash lamps in photography.^[54]

Catalysts

Rhenium in the form of rhenium-platinum alloy is used as catalyst for catalytic reforming, which is a chemical process to convert petroleum refinery naphthas with low octane ratings into high-octane liquid products. Worldwide, 30% of catalysts used for this process contain rhenium.^[55] The olefin metathesis is the other reaction for which rhenium is used as catalyst. Normally Re₂O₇ on alumina is used for this process.^[56] Rhenium catalysts are very resistant to chemical poisoning from nitrogen, sulfur and phosphorus, and so are used in certain kinds of hydrogenation reactions.^[13]^[57]^[58]

Other uses

The isotopes ¹⁸⁸Re and ¹⁸⁶Re are radioactive and are used for treatment of liver cancer. They both have similar penetration depth in tissue (5 mm for ¹⁸⁶Re and 11 mm for ¹⁸⁸Re), but ¹⁸⁶Re has advantage of longer lifetime (90 hours vs. 17 hours).^[59]^[60]

¹⁸⁸Re is also being used experimentally in a novel treatment of pancreatic cancer where it is delivered by means of the bacterium Listeria monocytogenes.^[61]

Related by periodic trends, rhenium has a similar chemistry to that of technetium; work done to label rhenium onto target compounds can often be translated to technetium. This is useful for radiopharmacy, where it is difficult to work with technetium – especially the 99m isotope used in medicine – due to its expense and short half-life.^[59]^[62]

Precautions

Very little is known about the toxicity of rhenium and its compounds because they are used in very small amounts. Soluble salts, such as the rhenium halides or perrhenates, could be hazardous due to elements other than rhenium or due to rhenium itself.^[63] Only a few compounds of rhenium have been tested for their acute toxicity; two examples are potassium perrhenate and rhenium trichloride, which were injected as a solution into rats. The perrhenate had an LD₅₀ value of 2800 mg/kg after seven days (this is very low toxicity, similar to that of table salt) and the rhenium trichloride showed LD₅₀ of 280 mg/kg.^[64]

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External links

Rhenium at The Periodic Table of Videos (University of Nottingham)

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1. 膝関節の炎症性関節炎に対する滑膜切除synovectomy for inflammatory arthritis of the knee [show details]
…the responses more durable. A subsequent study comparing the use of yttrium-90, phosphorus-32, or rhenium-188 with triamcinolone alone suggested comparable efficacy; however, a longer duration of pain relief…
2. 進行前立腺癌における骨転移：マネージメントbone metastases in advanced prostate cancer management [show details]
…studied are strontium-89 and samarium-153. Other isotopes studied include phosphorus-32, rhenium-186, and rhenium-188 . Multiple clinical trials have evaluated the efficacy of strontium-89 in men with…
3. 頭蓋咽頭腫craniopharyngioma [show details]
…irradiation via stereotactically applied radioisotopes . Beta-emitting isotopes such as yttrium-90 (90Yt), rhenium-186 (186Rh), and phosphorus-32 (32P) are preferred because of the limited penetrance of the emitted…
4. 有痛性骨転移のマネージメントのための放射線療法radiation therapy for the management of painful bone metastases [show details]
…Bone-targeting radioisotopes (eg, the beta-emitting agents strontium-89, samarium-153 lexidronam, and rhenium-186, and alpha-emitting radium-223) localize to areas of osteoblastic activity and are indicated…

English Journal

Multi-elemental analysis of human lung samples using inductively coupled plasma mass spectrometry.

Morton J1, Tan E2, Suvarna SK3.
Journal of trace elements in medicine and biology : organ of the Society for Minerals and Trace Elements (GMS).J Trace Elem Med Biol.2017 Sep;43:63-71. doi: 10.1016/j.jtemb.2016.11.008. Epub 2016 Nov 19.
PMID 27890402

Rational design of GO modified Fe3O4/SiO2 nanoparticles with combined rhenium-188 and gambogic acid for magnetic target therapy.

Yang Y, Liu Y, Cheng C, Shi H, Yang H, Yuan H, Ni C.
ACS applied materials & interfaces.ACS Appl Mater Interfaces.2017 Aug 10. doi: 10.1021/acsami.7b07589. [Epub ahead of print]
Peanut-like magnetic-fluorescent Fe3O4/SiO2 nanoparticles, with an effective dynamic diameter of 180 nm, were synthesized in this study via EuO+ doping and coupling of two Fe3O4 cores reassembly through solvothermal process. Spherical pure Fe3O4/SiO2 nanoparticles with an effective dynamic diameter
PMID 28793762

Electrodeposited high strength, thermally stable spectrally selective rhenium nickel inverse opals.

Zhang R1, Cohen J, Fan S, Braun PV.
Nanoscale.Nanoscale.2017 Aug 10;9(31):11187-11194. doi: 10.1039/c7nr03567e.
PMID 28749496

Japanese Journal

One-dimensionalization by Geometrical Frustration in the Anisotropic Triangular Lattice of the 5<italic>d</italic>Quantum Antiferromagnet Ca3ReO5Cl2

Hirai Daigorou,Nawa Kazuhiro,Kawamura Mitsuaki,Misawa Takahiro,Hiroi Zenji
Journal of the Physical Society of Japan 88(4), 2019-03-25
NAID 160000039262

Materials Transactions, JIM

Saito Shigeru,Takashima Toshiyuki,Horiuchi Toshiaki,Miura Seiji,Narita Toshio
MATERIALS TRANSACTIONS 60(4), 611-615, 2019
Ternary Nb–Re–Si alloy samples were melted and pulled simultaneously in a tetra-arc furnace and rapidly water-quenched after heat treatment at 1150°C for 1200 h. The microstructures of the sa …
NAID 130007618564

Magnetic properties of rare earth rhenium oxides Ln(3)ReO(7) (Ln = Y, Er-Lu) with fluorite-related structure

Inabayashi Masaki,Doi Yoshihiro,Wakeshima Makoto,Hinatsu Yukio
Journal of the Ceramic Society of Japan 126(11), 920-924, 2018-11
… Ternary rare earth rhenium oxides Ln(3)ReO(7) (Ln = Y, Er-Lu) have been prepared. …
NAID 120006585784

★リンクテーブル★

リンク元

「Re」

Rhenium, ₇₅Re
General properties
Name, symbol	rhenium, Re
Pronunciation	/ˈriːniəm/; REE-nee-əm
Appearance	silvery-grayish
Rhenium in the periodic table
	tungsten ← rhenium → osmium
Atomic number	75
Standard atomic weight (±) (Ar)	186.207(1)
Element category	transition metal
Group, block	group 7, d-block
Period	period 6
Electron configuration	[Xe] 4f14 5d5 6s2
per shell	2, 8, 18, 32, 13, 2
Physical properties
Phase	solid
Melting point	3459 K (3186 °C, 5767 °F)
Boiling point	5869 K (5596 °C, 10105 °F)
Density near r.t.	21.02 g/cm3
when liquid, at m.p.	18.9 g/cm3
Heat of fusion	60.43 kJ/mol
Heat of vaporization	704 kJ/mol
Molar heat capacity	25.48 J/(mol·K)
Atomic properties
Oxidation states	7, 6, 5, 4, 3, 2, 1, 0, −1 (a mildly acidic oxide)
Electronegativity	Pauling scale: 1.9
Ionization energies	1st: 760 kJ/mol; 2nd: 1260 kJ/mol; 3rd: 2510 kJ/mol; (more)
Atomic radius	empirical: 137 pm
Covalent radius	151±7 pm
Miscellanea
Crystal structure	hexagonal close-packed (hcp)
Speed of sound thin rod	4700 m/s (at 20 °C)
Thermal expansion	6.2 µm/(m·K)
Thermal conductivity	48.0 W/(m·K)
Electrical resistivity	193 nΩ·m (at 20 °C)
Magnetic ordering	paramagnetic
Young's modulus	463 GPa
Shear modulus	178 GPa
Bulk modulus	370 GPa
Poisson ratio	0.30
Mohs hardness	7.0
Vickers hardness	1350-7850 MPa
Brinell hardness	1320–2500 MPa
CAS Registry Number	7440-15-5
History
Naming	after the river Rhine (German: Rhein)
Discovery and first isolation	Masataka Ogawa (1908)
Named by	Walter Noddack, Ida Noddack, Otto Berg (1922)
Most stable isotopes
	Main article: Isotopes of rhenium
	Decay modes in parentheses are predicted, but have not yet been observed
	view; talk; edit; · references

　　[★]

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rhenium