In an aqueous environment, iron(III) salts, like FeCl3 and Fe(ClO4)3 undergo hydrolysis, with the number of water molecules surrounding the cationic metal varying depending on the solution's pH. Fe(H2O)6 3+ exhibits a pale colour, necessitating excitation of the complex's LMCT transition by highly energetic light. Substituting the aqua ligands with excess additional ligands can prevent the hydrolysis event of FeCl3. The additional ligands coordinate with Fe(III) to stabilise the transition metal while simultaneously shifting the complex's absorption towards longer wavelengths. Only a limited number of reports are known where an LMCT photo transformation has been exclusively conducted in water. In 2023, Can Jin's research group accomplished the decarboxylative halogenation of aliphatic carboxylic acids via cerium LMCT in an aqueous medium. In the presence of molecular oxygen from air, Ce(III) is oxidised to the +4 species, which forms complexes with the carboxylic acid starting material, and the cleavage of the O-Ce bond is achieved upon excitation with 100 W blue LEDs (Scheme 1, a). The resulting electron-rich radicals are trapped with electrophilic bromine or chlorine radicals. In a similar project, Li et al. conducted the ligandaccelerated decarboxylative alkylation of heteroarenes using iron LMCT at 456 nm. The rate constant of irreversible decarboxylation and formation of nucleophilic carbon-centred radicals could be increased by employing pyridine-2-carboxylic acid (picolinic acid) as a ligand for Fe(III) and NaBrO3 as oxidant. The photoreactions were carried out in a solvent mixture of 9:1 v/v water and DMSO, and the alkylated products were obtained in moderate to good yields. However, the research group mentioned in the supporting information that the reaction fails in the absence of the additional pyridine carboxylic acid ligand (Scheme 1, b).