ArticleInorganic chemistry2026
Magneto-Optical Spectroscopy Across Three Oxidation States of a Europium Terpyridine Complex.
Article in Inorganic chemistry, 2026. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Not yet cited in PubMed.
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Abstract
We report the magneto-optical characterization of a homoleptic europium terpyridine complex in +3, +2, and formally 0 oxidation states. Magnetic circular dichroism (MCD) analysis of the f-f transitions of the Eu(III) complex revealed an effective D3h local symmetry in solution, higher than suggested by the solid-state structure, through the splitting pattern of its 7F0→5D2 transition. The Eu(II) complex, by contrast, exhibited broad MCD features spanning the visible region arising from 4f7[8S7/2]→4f6[7FJ]×ψ1 transitions (ψ = 5d or Lπ*, J = 0-6). We show theoretically and experimentally that when individual components of this J progression are unresolved, MCD and magnetic linear dichroism (MLD) spectra display characteristic "pseudo-A1" and "pseudo-A2" lineshapes, respectively. Variable-temperature variable-field measurements of both techniques reveal a near-zero Eu(II) zero-field splitting by monitoring MCD C0 and MLD G0 signal intensities. The formally Eu(0) complex was serendipitously isolated and its properties are consistent with a redox noninnocent [EuII(mtpy)(mtpy•-)2] formulation. Together, these results establish MCD and MLD spectroscopy as information-rich tools for probing f-block electronic structure across multiple oxidation states and transition types.
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