Rubidium carbide
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| Surname | Rubidium carbide | |||||||||
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Rubidium acetylide |
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| Molecular formula | Rb 2 C 2 | |||||||||
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| Molar mass | 194.96 g mol −1 | |||||||||
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| As far as possible and customary, SI units are used. Unless otherwise noted, the data given apply to standard conditions . | ||||||||||
Rubidium carbide , actually rubidium acetylide , is a chemical compound of rubidium from the group of acetylides with the empirical formula Rb 2 C 2 .
synthesis
If acetylene is introduced into a solution of rubidium in liquid ammonia , a reaction occurs and a partially deprotonated acetylide RbHC 2 is formed . Slow heating in vacuo gives dark red crystals of rubidium acetylide.
properties
Rubidium carbide appears in two crystal structures , so-called polymorphs , which can also coexist. The hexagonal modification crystallizes in the sodium peroxide type, the orthorhombic in a new type similar to lead chloride . Here the acetylide dumbbells occupy the lead seats of the grid.
Reactions
Rb 2 C 2 decomposes when water is added to form acetylene and rubidium hydroxide . Diluted and concentrated hydrochloric acid decompose it in the same way; Rb 2 C 2 reacts explosively with nitric acid . It is not attacked by dry oxygen at room temperature, but burns in gaseous fluorine , chlorine , bromine or iodine . After slight heating , Rb 2 C 2 reacts with liquid sulfur , phosphorus , arsenic , silicon and boron . Rb 2 C 2 reduces the oxides of copper , iron and chromium . Heating a mixture Rb 2 C 2 with calcium in vacuum to form metallic rubidium.
literature
- T. Ya. Kosolapova: Carbides. Plenum Press, New York 1971
- Stefan Julian Liebig: New acetylide syntheses, structures, properties. Dissertation, University of Cologne, 2012
Individual evidence
- ↑ This substance has either not yet been classified with regard to its hazardousness or a reliable and citable source has not yet been found.
- ↑ a b c Ruschewitz, Uwe & Muller, P & Kockelmann, Winfried. (2001). On the crystal structure of Rb 2 C 2 and Cs 2 C 2 . Journal of Inorganic Chemistry. 627. doi : 10.1002 / 1521-3749 (200103) 627: 3 <513 :: AID-ZAAC513> 3.0.CO; 2-I .