Nickel phosphides

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Nickel phosphides are inorganic chemical compounds between nickel and phosphorus , a large number of which are known. The existence of the compounds Ni 3 P, Ni 5 P 2 , Ni 12 P 5 , Ni 2 P, Ni 5 P 4 , NiP, NiP 2 and NiP 3 is adequately secured by structural analysis . A mineral with the composition (Ni, Fe) 3 P is also known under the name nickel phosphide .

Extraction and presentation

Nickel phosphides can all be prepared from finely divided nickel powder and red phosphorus while maintaining the desired stoichiometry . Precipitation of nickel salt solutions with monophosphine is also possible .

properties

Nickel phosphides are dark gray, black or blue-black colored, metal-rich phosphides, metallic gray solids. They are insoluble in concentrated hydrochloric acid , but soluble in heated concentrated nitric acid and aqua regia . The phosphides do not attack quartz up to around 900 ° C, even if they are exposed to them for a long time.

Examples of nickel phosphides
Surname Dinickel phosphide Trinickel phosphide Pentanickel diphosphide
Molecular formula Ni 2 P Ni 3 P Ni 5 P 2
CAS number 12035-64-2 12059-19-7 11103-55-2
PubChem 4321486
Molar mass 148.39 g mol −1 207.08 g mol −1 355.50 g mol −1
Physical state firmly
Brief description gray solid silver-white needles
density 7.2 g cm −3 5.99 g cm −3 7.28 g cm −3
Melting point 1112 ° C 1185 ° C
Crystal structure hexagonal tetragonal trigonal
Space group P 6 2 m (No. 189)Template: room group / 189 I 4 (No. 82)Template: room group / 82 P 3 c 1 (No. 165)Template: room group / 165

Individual evidence

  1. ↑ a b c Georg Brauer (Ed.) U. a .: Handbook of Preparative Inorganic Chemistry. 3rd, revised edition. Volume III, Ferdinand Enke, Stuttgart 1981, ISBN 3-432-87823-0 , p. 1697.
  2. ↑ mineralienatlas.de: Mineralienatlas Lexikon - Nickelphosphid , accessed on January 29, 2017
  3. ↑ a b c d e f g h i j k l m Jean d'Ans, Ellen Lax, Roger Blachnik: Pocket book for chemists and physicists . Springer DE, 1998, ISBN 3-642-58842-5 , pp. 642 f . ( limited preview in Google Book search).
  4. ↑ a b S. Oryshchyn, V. Babizhetskyy, S. Chykhriy, L. Aksel'rud, S. Stoyko, J. Bauer, R. Guérin, Yu. Kuz'ma: Crystal Structure of Ni 5 P 2 . In: Inorganic Materials. 40, 2004, pp. 380-385, doi : 10.1023 / B: INMA.0000023960.30599.22 .