ISSN:
0018-019X
Keywords:
Chemistry
;
Organic Chemistry
Source:
Wiley InterScience Backfile Collection 1832-2000
Topics:
Chemistry and Pharmacology
Notes:
The kinetics of the interaction between molecular oxygen and the Co2+-complexes of the three terdentate ligands Z, N-(2-picolyl)-ethylenediamine (PEN), N-(2-picolyl)-oxamide (POA) and diethylenetriamine (DIEN) have been studied spectrophotometrically and using an O2 specific Clark electrode. Starting from the respective 1:1- and 1:2-complexes, the binuclear species ZCoO2(OH)CoZ and Z2CoO2CoZ2 are formed with each ligand. The existence of the former product shows that a minimum of three chelating nitrogen donors is sufficient to make a Co2+-complex reactive towards O2.As derived from the empirical rate laws the same general reaction mechanism must be valid for all three systems. In the case of PEN- and DIEN-complexes the oxygen adducts are metastable intermediates and formed in stoichiometric quantities. With POA irreversible formation of cobaltic species is rapid, and O2-adducts are present in steady state concentrations only, except in strongly basic solutions.
Additional Material:
2 Ill.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1002/hlca.19700530207
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