Salcomine

Salcomine[1]
Names
Other names
  • N,N′-Bis(salicylidene)ethylenediaminocobalt(II)
  • Co(salen)
Identifiers
14167-18-1 YesY
3D model (Jmol) Interactive image
ECHA InfoCard 100.034.541
PubChem 11012797
Properties
C16H14CoN2O2
Molar mass 325.23 g·mol−1
Hazards
Safety data sheet Oxford MSDS
R-phrases R36/37/38
S-phrases S26 S36
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

Salcomine is a coordination complex derived from the salen ligand and cobalt. The complex, which is planar, and a variety of its derivatives are carriers for O2 as well as oxidation catalysts.[2]

Preparation and structure

The compound features square planar Co(II). It forms a variety of five-coordinate adducts, as is typical for complexes of d7 metals. In addition to oxygen and nitrogen donor sites provided by the salen2−, the metal typically is bound to pyridine (py) to give the complex Co(salen)(py). Such complexes bind O2 to give derivatives of the type (μ-O2)[Co(salen)py]2 and [Co(salen)py(O2)].[2]

Salcomine is commercially available. It may be easily synthesized from cobalt(II) acetate and salenH2:[3]

Applications

The 1938 report that this compound reversibly bound O2 led to intensive research on salen and related ligands for the storage or transport of oxygen.[4] Salcomine catalyzes the oxidation of 2,6-disubstituted phenols by dioxygen.[5]

References

  1. ↑ N,N′-Bis(salicylidene)ethylenediaminocobalt(II) at Sigma-Aldrich
  2. 1 2 Shoichiro Yamada “Advancement in stereochemical aspects of Schiff base metal complexes” Coordination Chemistry Reviews 1999, volume 190–192, 537–555.
  3. ↑ Appleton, T. G. (1977). "Oxygen Uptake by a Cobalt(II) Complex". J. Chem. Ed. 54 (7): 443. doi:10.1021/ed054p443.
  4. ↑ Tokuichi Tsumaki (1938). "Nebenvalenzringverbindungen. IV. Über einige innerkomplexe Kobaltsalze der Oxyaldimine". Bulletin of the Chemical Society of Japan. 13 (2): 252–260. doi:10.1246/bcsj.13.252.
  5. ↑ C. R. H. I. De Jonge, H. J. Hageman, G. Hoentjen, and W. J. Mijs (1988). "Oxidation with Bis(Salicylidene)ethylenediiminocobalt(II) (Salcomine): 2,6-Di-''tert''-butyl-''p''-benzoquinone". Org. Synth.; Coll. Vol., 6, p. 412
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