| Summary: | The excitation of lanthanides with visible light to promote photochemical reactions has garnered interest in recent years. Lanthanides serve as initiators for photochemical reactions because they exhibit visible-light-promoted 4f→5d transitions that lead to emissive states with electrochemical potentials that are more negative than the corresponding ground states. The lanthanides that have shown the most promising characteristics for visible-light promoted photoredox are Sm<sup>II</sup>, Eu<sup>II</sup>, and Ce<sup>III</sup>. By understanding the effects that ligands have on the 5d orbitals of Sm<sup>II</sup>, Eu<sup>II</sup>, and Ce<sup>III</sup>, luminescence and reactivity can be rationally modulated using coordination chemistry. This review briefly overviews the photochemical reactivity of Sm<sup>II</sup>, Eu<sup>II</sup>, and Ce<sup>III</sup> with visible light; the properties that influence the reactivity of these ions; and the research that has been reported towards modulating their photochemical-relevant properties using visible light and coordination chemistry.
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