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Cobalt(II) cyanide

Summary

Cobalt(II) cyanide is the inorganic compound with the formula Co(CN)2. It is coordination polymer that has attracted intermittent attention over many years in the area of inorganic synthesis and homogeneous catalysis.

Cobalt(II) cyanide
Names
IUPAC name
Cobalt(II) cyanide
Other names
cobaltous cyanide
Identifiers
  • 542-84-7 checkY
  • 20427-11-6 (dihydrate) ☒N
  • 26292-31-9 (trihydrate) ☒N
3D model (JSmol)
  • Interactive image
ChemSpider
  • 61631 checkY
ECHA InfoCard 100.008.028 Edit this at Wikidata
  • 68336
UNII
  • 3300OC3VVZ checkY
  • DTXSID20969165 Edit this at Wikidata
  • InChI=1S/2CN.Co/c2*1-2;/q2*-1;+2 checkY
    Key: CWZOMTYLSNXUEL-UHFFFAOYSA-N checkY
  • InChI=1/2CN.Co/c2*1-2;/q2*-1;+2
    Key: CWZOMTYLSNXUEL-UHFFFAOYAR
  • [Co+2].[C-]#N.[C-]#N
Properties
Co(CN)2
Molar mass 110.968 g/mol (anhydrous)
147.00 g/mol (dihydrate)
165.02 g/mol (trihydrate)
Appearance deep-blue powder
hygroscopic (anhydrous)
reddish-brown powder (dihydrate)
Density 1.872 g/cm3 (anhydrous)
Melting point 280 °C (536 °F; 553 K) (anhydrous)
insoluble[1]
Solubility dihydrate
degraded with dissolution by NaCN, KCN, NH4OH, HCl
+3825·10−6 cm3/mol
Related compounds
Other anions
 Cadmium chloride,
Cadmium iodide
Other cations
 Zinc cyanide,
Calcium cyanide,
Magnesium cyanide
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).
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Infobox references

Uses edit

Cobalt(II) cyanide has been used as a precursor to dicobalt octacarbonyl.[2]

Preparation and structure edit

The trihydrate salt is obtained as a reddish-brown precipitate by adding two equivalents of potassium cyanide to a cobalt salt solution:[3]

CoCl2(H2O)6 + 2 KCN → Co(CN)2 + 2 KCl + 6 H2O

With excess cyanide, the red brown dicyanide dissolves to give pentacyanocobaltate.[4]

Solid cobalt(II) cyanide is a coordination polymer consisting of cobalt ions linked by cyanide units in a cubic arrangement, each such cobalt atom having octahedral geometry, and an additional cobalt atom in half of the cubic cavities.[5] That is, the structure is actually Co[Co(CN)3]2 in a zeolite-like structure. It forms hydrates and other inclusion complexes by having substances diffuse into the cavities that do not contain the cobalt atoms.[5]

References edit

  1. ^ Lide, David R., ed. (2006). CRC Handbook of Chemistry and Physics (87th ed.). Boca Raton, FL: CRC Press. ISBN 0-8493-0487-3.
  2. ^ Sternberg, Heinz W.; Wender, Irving; Orchin, Milton; Lynch Jr., M. A.; Sesny, W. J. (1957). "Cobalt Tetracarbonyl Hydride". Inorganic Syntheses. Inorganic Syntheses. Vol. 5. pp. 192–195. doi:10.1002/9780470132364.ch55. ISBN 9780470132364.
  3. ^ Bigelow, John H.; Bailar Jr., John C. (1946). "Potassium Hexacyanocobaltate(III)". Inorganic Syntheses. Inorganic Syntheses. Vol. 2. pp. 225–227. doi:10.1002/9780470132333.ch72. ISBN 9780470132333.
  4. ^ Kwiatek, Jack (1968). "Reactions Catalyzed by Pentacyanocobaltate(II)". Catalysis Reviews. 1: 37–72. doi:10.1080/01614946808064700.
  5. ^ a b Weiss, Armin; Rothenstein, W. (1963). "Cobalt(II) Cyanide, its Three-Demensional Frame-work Structure and Zeolitic Compounds". Angewandte Chemie International Edition. 2 (7): 396. doi:10.1002/anie.196303962.