Abstract
Twelve iron(III) complexes [FeIII(LX)2]ClO4, where (LX)− is the deprotonated form of a series of asymmetric ligands containing pyridine and substituted phenol moieties (XPh(OH)–CH=N–(CH2) n –Py that X = H, 5-Br, 5-NO2, 5-OMe, 4-OMe, 3-OMe, and n = 1, 2), were synthesized and characterized by 1H NMR, IR, UV-Vis spectroscopy, mass spectrometry, and elemental analysis. Formation constants were measured using UV-Vis spectrophotometric titration at constant ionic strength (0.10 M NaClO4) at 25 (±0.1)°C. The trend of the complex formation of Fe(III) ion with a given tridentate ligand decreases as follows:
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