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. Author manuscript; available in PMC: 2021 Apr 15.
Published in final edited form as: Inorg Chem. 2020 May 5;59(10):6648–6678. doi: 10.1021/acs.inorgchem.0c00510

Table 5.

Comparison of pKa values for water co-ligand of representative Fe3+ complexes shown in Fig 8 demonstrates that water co-ligand pKa is very sensitive to changes in ligand structure and electronics.

pKa – water co-ligand
Fe-CyDTA109 9.6
Fe-PyC3A110 8.5
Fe-EDTA109 7.6
Fe-PhDTA108 <4.0