Ketopiperazinediacetate zinc and copper complexes in the degradation of ethylenediaminetriaceta
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Polymeric ketopiperazinediacetate complexes [M(kpda)(H(2)O)(2)](n)center dot H(2)O (M = Cu, 1; Zn, 2. H(2)kpda = ketopiperazinediacetic acid, C(8)H(12)N(2)O(5)) were obtained from the reactions of copper chloride and zinc nitrate with ethylenediaminetriacete at pH 5.0 (H(3)ed3a = ethylenediaminetriacetic acid), where ed3a is in equilibrium with amidation product of kpda. 1 or 2 consists of a monomeric neutral unit [M(kpda)(H(2)O)(2)](n), where ketopiperazinediacetate anion serves as bridged ligand through the amine nitrogen and the acetate oxygen forming a glycinate metallocycle, and the other acetate coordinates bidentately with the neighboring metal atom. The former could be converted to [Cu(II)(ox)(phen)(H(2)O)]center dot H(2)O (3) after the addition of phenanthroline (H(2)ox = oxalic acid, phen = phenanthroline), which shows degradation of ethylenediaminetriaceta, where [Cu(I)(phen)(2)Cl]center dot 6H(2)O (4) and [Cu(II)(phen)(2)(H(2)O)](NO(3))(2) (5) were isolated in the reaction sequence. (C) 2011 Elsevier B.V. All rights reserved.
CitationINORGANIC CHEMISTRY COMMUNICATIONS，2011,14（6）：990-992