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Investigation of complex compounds in solution using paper electrophoresis. IV. Complexes of 1,3-diamino-2-propanol-N,N,N',N'-tetraacetic acid

V. Jokl and J. Majer

Komenský University, Bratislava

Abstract:  The chelating properties of 1,3-diaminopropan-2-ol-N,N,N',N'-tetraacetic acid (I) were studied by a paper electrophoretic method and compared with those of ethylenediaminetetraacetic acid (II). The curves of the electrophoretic mobility of the complexes indicated that in most cases, both I and II formed mononuclear chelates in a 1:1 ratio of metal: agent. The alc. group of I did not participate in the chelation. Pb(II)-chelate is different; it is binuclear and of the compn. Pb₂A^-. It is stable in the soln. at pH >4.0, but at its formation the cleavage a proton from the hydroxyl group indicated I to be a 7-donor agent. Mononuclear Fe(III)-chelate, FeA-, exists over a very narrow range of conditions; possibly, at pH >4.0 there was a cleavage of a proton from the hydroxyl group with coordination of its O. The stability of the chelates of I with the exception of Cu(II) chelate, was considerably lower than that of II chelates. The Mg chelate has exceptionally low stability.

Full paper in Portable Document Format: 194a249.pdf (in Czech)

Chemical Papers 19 (4) 249–258 (1965)