Potassium Cobaltinitrite

A. G. Vendilo^a, N. E. Kovaleva^a, V. I. Chistov^a, and V. M. Retivov^{a, b}

^a Institute of Chemical Reagents and Special-Purity Substances, Bogorodskii val 3, Moscow, 107079 Russia

^b Kurnakov Institute of General and Inorganic Chemistry, Russian Academy of Sciences,
Leninskii pr. 31, Moscow, 119991 Russia

e-mail: sl.chistov@gmail.com

Received Septemper 20, 2010

Abstract—Potassium cobaltinitrite K₃[Co(NO₂)₆] has been synthesized by three methods. The crystalline prod-
ucts have been characterized by scanning electron microscopy, X-ray powder diffraction, IR spectroscopy, and
thermal and sedimentation analyses. A comparative analysis of the synthetic methods has been carried out. The
highest yield, the smallest particle size, and the highest purity of the product are attained by reacting potassium
nitrite with cobalt nitrate in an acid medium in the same way as in the synthesis of sodium cobaltinitrite:
2CH₃COOH + Co(NO₃)₂ + 7KNO₂ K₃[Co(NO₂)₆] + 2KNO₃ + 2CH₃COOK + NO+ H₂O. All of the result-
ing potassium cobaltinitrite samples are hygroscopic. The water release and nitrite ion elimination temperature
intervals have been determined.

DOI: 10.1134/S0036023611040267

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