Cobalt(II) acetate explained
Cobalt(II) acetate is the cobalt salt of acetic acid. It is commonly found as the tetrahydrate Co(CH3CO2)2·4 H2O, abbreviated Co(OAc)2·4 H2O. It is used as a catalyst.
Synthesis and structure
Like many other transition metal acetates, cobalt(II) acetate forms by the reaction of cobalt oxide or hydroxide and acetic acid:
CoO + 2CH3CO2H + 3H2O → Co(CH3CO2)2·4 H2OThe tetrahydrate has been shown by X-ray crystallography to adopt an octahedral structure, the central cobalt centre being coordinated by four water molecules and two acetate ligands.[1] The analogous nickel acetate is isostructural.[2]
Various hydrates are known including Co(CH3CO2)2·H2O and [Co(CH<sub>3</sub>CO<sub>2</sub>)<sub>2</sub>]5·0.5 H2O.[3]
Reactions and uses
Cobalt acetate is a precursor to various oil drying agents, catalysts that allow paints and varnishes to harden.[4]
Anhydrous cobalt acetate is a widely used source of cobalt in the synthesis of materials,[5] catalyst,[6] and complexes.[7]
Safety
Cobalt salts are poisonous.
Notes and References
- 10.1107/S1600536803019093. Cobalt diacetate tetrahydrate. 2003. Sobolev. Alexandre N.. Miminoshvili. Elguja B.. Miminoshvili. Ketevan E.. Sakvarelidze. Tamara N.. Acta Crystallographica Section E. 59. 10. m836–m837.
- 10.1107/S0365110X5300171X . . The crystal structures of nickel acetate, Ni(CH3COO)2·4H2O, and cobalt acetate, Co(CH3COO)2·4H2O . 1953 . Van Niekerk . J. N. . Schoening . F. R. L. . 6 . 7 . 609–612.
- 10.1002/zaac.200900457. Infinite Coordination Polymers of One- and Two-dimensional Cobalt Acetates. 2010. Zhang. Gao. Lin. Jian. Guo. Dong-Wei. Yao. Shi-Yan. Tian. Yun-Qi. Zeitschrift für Anorganische und Allgemeine Chemie. 636. 7. 1401–1404.
- John Dallas Donaldson, Detmar Beyersmann, "Cobalt and Cobalt Compounds" in Ullmann's Encyclopedia of Industrial Chemistry, Wiley-VCH, Weinheim, 2005.
- 10.1038/nmat4113. Metal–organic framework nanosheets in polymer composite materials for gas separation. 2015. Rodenas. Tania. Luz. Ignacio. Prieto. Gonzalo. Seoane. Beatriz. Miro. Hozanna. Corma. Avelino. Kapteijn. Freek. Llabrés i Xamena. Francesc X.. Gascon. Jorge. Nature Materials. 14. 1. 48–55. 25362353. 4270742. 2015NatMa..14...48R.
- 10.1016/j.tet.2006.06.065. Recent advances in homogeneous transition metal-catalyzed aerobic alcohol oxidations. 2006. Schultz. Mitchell J.. Sigman. Matthew S.. Tetrahedron. 62. 35. 8227–8241.
- 10.1021/ed054p443 . . Oxygen Uptake by a Cobalt(II) Complex . Appleton, T. G. . 1977 . 54 . 7 . 443.
