Metal chelates of phosphonate-containing ligands-I Stability of some N,N,N',N'-ethylenediaminetetra(methylenephosphonic) acid metal chelates |
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| Authors: | Rizkalla E N Zaki M T |
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| Institution: | Department of Chemistry, Ain Shams University, Cairo, Egypt. |
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| Abstract: | A potentiometric investigation of the acid dissociation constants of the octabasic ENTMP N,N,N',N'-ethylenediaminetetra(methylenephosphonic) acid] is reported. The stability constants of protonated MH(n)L (n = 1, 2, 3 and 4) and unprotonated ML metal chelates of Mg, Ca, Ba and Cd with ENTMP have been measured. The stabilities are in the order Mg < Ca < Ba < Cd. |
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