Coordination complexes of transition metals that have long-lived charge-separated excited states have many photochemical applications such as solar energy conversion and photoredox catalysis. However, the traditionally used transition metals are in the second- and third-row, including Ir(III), Ru(II), and Re(I), which are both expensive and scarce. For this reason, researchers have attempted to find are developing photoactive complexes with alternative other transition metals. Manganese was chosen as the metal-of-focus as it is cheap, relatively non-toxic, and has a wide range of oxidation states. Our goal is to prepare photoactive manganese complexes: In particular, Mn(II) is both air-stable and easy to handle, making it a convenient starting point for research. In this work, we will describe the synthesis of tridentate polypyridyl ligands N,N’-dimethyl-N,N’-dipyridin-2-ylpyridine-2,6-diamine (ddpd) and di-2,6-(2-pyridylcarbonyl)pyridine (dcpp), as well as their corresponding Mn(II) complexes. By characterizing these complexes using X-ray crystallography and UV-vis spectroscopy, we can better understand their photophysical properties and discuss the properties of similar complexes.

Synthesis and characterization of Mn(II) polypyridyl complexes for photochemical applications

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