+++Thanks_Commander L_1 article from RSC

[pendyala123]

Formation and protonation of aminopolyphosphonate complexes of alkaline-earth and divalent transition-metal ions in aqueous solution
Kiyoshi Sawada, Takashi Kanda, Yasuo Naganuma and Toshio Suzuki
J. Chem. Soc., Dalton Trans., 1993, 2557-2562

DOI:

http://dx.doi.org/10.1039/DT9930002557

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http://pubs.rsc.org/en/content/articlelanding/1993/dt/dt9930002557#!divAbstract