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. Author manuscript; available in PMC: 2014 Jun 1.
Published in final edited form as: Metallomics. 2013 Jun;5(6):648–655. doi: 10.1039/c3mt00103b

Table 3.

Second-order rate constants for metal complex formation by reactions with non-protonated ligand (kL) and mono-protonated chelator (kHL).

TPA TPEN
10−6 kL (M−1 s−1) 8 ± 4 10.2 ± 0.4
10−6 kHL (M−1 s−1) 0 ± 2 0.6 ± 0.1