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Electrochemical Characterization of Fe(II) Complexation Reactions at an Electrified Micro Liquid‐Liquid Interface
Author(s) -
Jiang Qi,
Reader Heather E.,
Stockmann Talia Jane
Publication year - 2021
Publication title -
chemelectrochem
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.182
H-Index - 59
ISSN - 2196-0216
DOI - 10.1002/celc.202100127
Subject(s) - electrochemistry , chemistry , ligand (biochemistry) , aqueous solution , differential pulse voltammetry , metal , metal ions in aqueous solution , ion , inorganic chemistry , redox , stoichiometry , voltammetry , cyclic voltammetry , analytical chemistry (journal) , nuclear chemistry , electrode , organic chemistry , biochemistry , receptor
Phytoplankton growth in the open ocean is critical to carbon fixation and often limited by low iron concentrations. Owing to its low solubility, phytoplankton employ ligands for iron uptake; therefore, ligand binding characterization is important. Herein, a micro immiscible liquid/liquid interface was employed with four ligands through an electrochemically induced facilitated ion‐transfer process. Ligands 1,10‐phenathroline (phen), 1‐nitroso‐2‐naphthol (N2N), 2‐(2‐thiazolylazo)‐p‐cresol (TAC), and salicylaldoxime (SAL), where tested using established facilitated ion‐transfer thermodynamics combined with differential pulse voltammetry. Three metal ion/ligand binding stoichiometries were observed for Fe 2+ :phen, whereas only one was observed with Fe 2+ with SAL, N2N, and TAC. Overall binding constants were calculated such that binding strengths can be ranked highest to lowest as phen>N2N>TAC>SAL. Additionally, the formal ion transfer for Fe 2+ (0.66 V) for an aqueous/1,2‐dichloroethane interface was also determined.