Abstract

Analysis of the pH-titration data in the Ni I I -1,2-diaminopropane/1,3-diaminopropane(A)-L-cysteine, D-penicillamine and L-cysteic acid(B) systems show the presence of NiAB ternary species in addition to the binary species HA, H 2 A, NiAH, NiA, NiA 2 H, NiA 2 , NiA 3 , HB, H 2 B, H 3 B, NiB, NiB 2 H and NiB 2 , The coordination of ligands A and B in both the binary and ternary complex species are similar and the ternary species tetracoordinated. The NiAB species have a square-planar structure.

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