Yang YC, Wu R, Cai Y, Zhou ZH. Unusual N-oxide formation in the peroxidation of cobalt(ii) ethylenediaminetetraacetates.
Dalton Trans 2017;
46:1290-1296. [PMID:
28067375 DOI:
10.1039/c6dt04346a]
[Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Unlike the usual formations of peroxo and superoxo cobalt products as oxygen carriers, N-oxido cobalt(ii) ethylenediaminetetraacetates K4[Co2(edtaO2)2]·nH2O [n = 6.5 (1), 10 (2), H4edta = ethylenediaminetetraacetic acid, C10H16O8N2] and their aggregate [Co2(edtaO2)(H2O)6]n·2nH2O (3) were obtained as dioxygen insertion products. The cobalt ions in dimers 1 and 2 are hexa-coordinated by two edtaO2 ligands in different configurations respectively, which is attributed to the packing of an interesting (H2O)12 water cluster in 2. Further reaction of K4[Co2(edtaO2)2]·nH2O with hydrogen peroxide results in the final trivalent cobalt ethylenediaminetetraacetate K[Co(edta)]·2H2O (4). A water-soluble coordination polymer Na2n[Co(edta)]n·4nH2O (5) was also obtained with a one dimensional zigzag structure. Bond valence calculation is consistent with the products 1-5.
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