The Co III Salen Complex

Paper Summary:

This paper discusses the results and conclusions from a chemistry experiment about the preparation and reversible oxygenation of the Co(II)(salen) complex.

From the Paper:

"The tetradentate N,N'-bis(salicylaldehyde)ethylenediimine 3, SalenH2, was prepared by the Schiff's base condensation of salicylaldehyde 1 and ethylenediamine 2 via the elimination of water1. SalenH2 3, was then used to prepare the red inactive form of the complex N,N'-bis(salicylaldehyde)ethylenediimino)cobalt(II) 4, Co(salen).
The inactive form of Co(salen) 4, consists of dimeric units in which the cobalt atom of one molecule interacts with an oxygen atom lone pair of the second molecule1. The inactive form of Co(salen) was investigated in DMSO in which oxygen is rapidly absorbed. The binding of the oxygen to cobalt was measured and was found that one mole of oxygen bound to two moles of cobalt. Values of the ratio for oxygen to cobalt are dependent on the nature of the ligands, temperature and solvents."

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