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Rhenium is a chemical element; it has symbol Re and atomic number 75. It is a silvery-gray, 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. It has the third-highest melting point and second-highest boiling point of any element at 5869 K. It resembles manganese and technetium chemically and is mainly obtained as a by-product of the extraction and refinement of molybdenum and copper ores. It shows in its compounds a wide variety of oxidation states ranging from −1 to +7.
Group 7, numbered by IUPAC nomenclature, is a group of elements in the periodic table. It contains manganese (Mn), technetium (Tc), rhenium (Re) and bohrium (Bh). This group lies in the d-block of the periodic table, and are hence transition metals. This group is sometimes called the manganese group or manganese family after its lightest member; however, the group itself has not acquired a trivial name because it belongs to the broader grouping of the transition metals.
A chloride sulfite or sulfite chloride is a chemical compound that contains chloride and sulfite anions (SO32− Cl−). The known compounds of this type are all late transition metal sulfito complexes. Chlorine may be present as a ligand (chloro) or as an ion (chloride). The sulfito ligand can connect to the metal atom by way of an oxygen, or a sulfur atom. It can also link to the metal atom using two oxygen atoms as a bidentate ligand.
Manganese(II) chlorate is an unstable chemical compound with the formula Mn(ClO3)2. It is unstable even in dilute solution. As a hexahydrate, it is solid below −18°C. Above this it melts, to form an extremely explosive pink liquid.
Rhenium compounds are compounds formed by the transition metal rhenium (Re). Rhenium can form in many oxidation states, and compounds are known for every oxidation state from -3 to +7 except -2, although the oxidation states +7, +4, and +3 are the most common. Rhenium is most available commercially as salts of perrhenate, including sodium and ammonium perrhenates. These are white, water-soluble compounds. The tetrathioperrhenate anion [ReS4]− is possible.
Technetium(IV) oxide, also known as technetium dioxide, is a chemical compound with the formula TcO2 which forms the dihydrate, TcO2·2H2O, which is also known as technetium(IV) hydroxide. It is a radioactive black solid which slowly oxidizes in air.
Rhenium tetrafluoride is a binary inorganic compound of rhenium and fluorine with the chemical formula ReF4.
Technetium pentafluoride is a binary inorganic chemical compound of technetium metal and fluorine with the chemical formula TcF
5.
Rhenium(III) iodide is a binary chemical compound of rhenium and iodide with the chemical formula ReI
3.
Rhenium tetraiodide is a binary chemical compound of rhenium and iodide with the chemical formula ReI
4.
Manganese(II) perchlorate is an inorganic chemical compound with the formula Mn(ClO4)2. It forms a white-colored anhydrous and a rose-colored hexahydrate, both of which are hygroscopic. As a perchlorate, it is a strong oxidizing agent.
Lithium hexafluorostannate is an inorganic chemical compound with the chemical formula Li2SnF6.
Thallium(I) hexafluorophosphate is an inorganic chemical compound with the chemical formula TlPF6.
Ammonium hexafluorochromate is an inorganic chemical compound with the chemical formula (NH4)3CrF6.
Potassium hexabromorhenate is an inorganic chemical compound with the chemical formula K2ReBr6.
Potassium hexafluororhenate is an inorganic chemical compound with the chemical formula K2ReF6.
Ammonium hexafluorogermanate is an inorganic chemical compound with the chemical formula (NH4)2GeF6.
Ammonium hexafluorotantalate is an inorganic chemical compound with the chemical formula NH4TaF6.
Ammonium hexafluoroindate is an inorganic chemical compound with the chemical formula (NH4)3InF6.
Ammonium hexafluoroniobate is an inorganic chemical compound with the chemical formula NH4NbF6.
References
- ↑ Donnay, Joseph Désiré Hubert (1963). Crystal Data; Determinative Tables. American Crystallographic Association. p. 1155. Retrieved 16 September 2024.
- ↑ Some Fluorine Compounds of Rhenium and Technetium. Oak Ridge National Laboratory . Retrieved 16 September 2024.
- ↑ Donnay, Joseph Désiré Hubert (1973). Crystal Data: Inorganic compounds. National Bureau of Standards. p. H-62. Retrieved 16 September 2024.
- ↑ Kemmitt, R. D. W.; Peacock, R. D. (6 June 2016). The Chemistry of Manganese, Technetium and Rhenium: Pergamon Texts in Inorganic Chemistry. Elsevier. p. 970. ISBN 978-1-4831-3806-0 . Retrieved 16 September 2024.
- ↑ Kemmitt, R. D. W.; Peacock, R. D. (6 June 2016). The Chemistry of Manganese, Technetium and Rhenium: Pergamon Texts in Inorganic Chemistry. Elsevier. p. 971. ISBN 978-1-4831-3806-0 . Retrieved 16 September 2024.