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4187080
Low-spin manganese (II) complex with an emissive charge-transfer excited state
Date
March 23, 2025
Transition metal chromophores with long-lived charge-separated excited states that can be accessed via visible light are popular within the field of inorganic chemistry and photophysics given their usefulness in applications ranging from photoredox catalysis to solar energy conversion. Traditionally, these complexes are comprised of Re(I), Ru(II), Os(II), and Ir(III) given that they are stable in solution and possess long-lived metal-to-ligand charge-transfer excited states. Unfortunately, these metals are exceedingly rare and expensive and thus are unsuitable for larger scale applications. Manganese is an exciting alternative given that it is the third-most earth abundant transition metal, is relatively nontoxic, and possesses robust redox properties. Our work focuses on the synthesis and characterization of a low-spin Mn(II) complex with aromatic ligands. Spectroscopic characterization of the complex revealed two absorption bands in the visible region which both exhibited charge-transfer character. The assignment of these bands as charge-transfer transitions is further supported by electrochemistry. Furthermore, we observed these excited states to be emissive. These results are described in this talk, as well as their implications for the development of new photoactive manganese complexes.
Coordination complexes of second and third-row transition metals such as Ru(II), Ir(III), Os(II), and Re(I) have been used extensively for photochemical applications which include use in photovoltaic cells and photoredox catalysis due to their photophysical properties…
Asymmetric (_E_)-[(2-pyridyl)methylene]aniline ligands (abbreviated ppaX, where X is the substituent on the aniline ring) have been reported in complexes of a multitude of divalent transition metals (Fe, Ni, Pd, Cd, Zn, Mn, etc.)…