Metal chelates of tripolyphosphate

Taqui Khan, M. M. ; Rabindra Reddy, P. (1971) Metal chelates of tripolyphosphate Journal of Inorganic and Nuclear Chemistry, 33 (5). pp. 1427-1433. ISSN 0022-1902

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Official URL: http://www.sciencedirect.com/science/article/pii/0...

Related URL: http://dx.doi.org/10.1016/0022-1902(71)80438-4

Abstract

Stability constants of 1 : 1 and 2 : 1 chelates of TPP with bivalent metal ions, Cu(II), Zn(II), Co(II), Mn(II), Ni(II), Mg(II), Ca(II), Sr(II) and Ba(II) are reported at 45°C and 0·10 ionic strength. The stabilities decrease in the order Cu(II) > Co(II) > Mn(II) > Zn(II) > Ni(II) > Mg(II) > Ca(II) > Sr(II) > Ba(II) for the 1 : 1 protonated complexes and for the normal 1 : 1 complexes, in the order Cu(II) > Ni(II) > Zn(II) > Co(II) > Mn(II) > Mg(II) > Ca(II) > Sr(II) > Ba(II). For the 2 : 1 protonated and normal complexes the stabilities decrease in the order Cu(II) > Mn(II) > Co(II) > Ni(II) > Zn(II) > Mg(II) and Cu(II) > Mn(II) > Ni(II) > Co(II) > Zn(II) > Mg(II) respectively.

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