Phosphorus (II) iodide
Structural formula | ||||||||||||||||
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General | ||||||||||||||||
Surname | Phosphorus (II) iodide | |||||||||||||||
other names |
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Molecular formula | P 2 I 4 | |||||||||||||||
Brief description |
light red crystals |
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properties | ||||||||||||||||
Molar mass | 569.57 g mol −1 | |||||||||||||||
Physical state |
firmly |
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Melting point |
125.5 ° C |
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safety instructions | ||||||||||||||||
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As far as possible and customary, SI units are used. Unless otherwise noted, the data given apply to standard conditions . |
Phosphorus (II) iodide is a chemical compound with the molecular formula P 2 I 4 . It consists of two phosphorus atoms in the oxidation state +2, which via a single bond connected to each other. Each phosphorus atom also has two bonds to iodine atoms.
presentation
Phosphorus (II) iodide can be obtained from the elements . For this purpose, white phosphorus is reacted with elemental iodine.
Further possibilities are the iodination of phosphine and the iodination of phosphorus trichloride with potassium iodide .
properties
Phosphorus (II) iodide is a solid compound at room temperature that melts at 125.5 ° C. Phosphorus (II) iodide reacts with bromine to form a mixture of phosphorus triiodide , phosphorus tribromide and the mixed halides PBr 2 I and PBrI 2 .
The connection has a triclinic crystal structure with space group P 1 (space group no. 2) .
use
Phosphorus (II) iodide can be used for the synthesis of aziridines from amino alcohols.
It is also used to produce nitriles from carboxylic acids .
Individual evidence
- ^ A b c d A. F. Holleman , E. Wiberg , N. Wiberg : Textbook of Inorganic Chemistry . 101st edition. Walter de Gruyter, Berlin 1995, ISBN 3-11-012641-9 .
- ↑ a b Data sheet Diphosphorus tetraiodide from Sigma-Aldrich , accessed on April 19, 2011 ( PDF ).
- ↑ H. Suzuki, T. Fuchita, A. Iwasa, T. Mishina: Diphosphorus Tetraiodide as a Reagent for Converting Epoxides into Olefins, and Aldoximes into Nitriles under Mild Conditions , in: Synthesis , 1978 , 12 , pp. 905-908; doi : 10.1055 / s-1978-24936 .
- ^ AH Cowley, ST Cohen: The Iodides of Phosphorus. II. The Reaction of Bromine with Diphosphorus Tetraiodide , in: Tetrahedron Letters , 1965 , 4 , pp. 1221-1222; doi : 10.1021 / ic50030a029 .
- ^ Matthias F. Groh, Ulrike Müller, Ejaz Ahmed, Alexander Rothenberger, Michael Ruck: Substitution of Conventional High-temperature Syntheses of Inorganic Compounds by Near-room-temperature Syntheses in Ionic Liquids. In: Zeitschrift für Naturforschung B. 68, 2013, doi : 10.5560 / ZNB.2013-3141 .
- ↑ H. Suzuki, H. Tani: A mild cyclization of 2-aminoalcohols to aziridines using diphosphorus tetraiodide , in: Chemistry Letters , 1984 , 13 , pp. 2129-2130; doi : 10.1246 / cl.1984.2129 .
- ↑ VN Telvekar, RA Rane: A novel system for the synthesis of nitriles from carboxylic acids , in: Tetrahedron Letters , 2007 , 48 , pp. 6051-6053; doi : 10.1016 / j.tetlet.2007.06.108 .