ArticleInorganic chemistry2026
π-Conjugation Mediates Competing J12 and J13 Interactions at the Nanometric Scale in Linear Fe(III) Porphyrin Trimers.
Article in Inorganic chemistry, 2026. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Cited by 1 paper.
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1 citing paper in PubMed.
- π-Conjugation Mediates Competing J12 and J13 Interactions at the Nanometric Scale in Linear Fe(III) Porphyrin Trimers.Inorganic chemistry · 2026Article
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9 authors.
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Abstract
The control of spin-spin interactions is a central challenge in designing materials for quantum technologies. A promising avenue for increasing magnetic coupling between spin centers is to connect them via a delocalized π-conjugated system. Here, we synthesized a family of porphyrins (monomers, dimers, and trimers) with high-spin FeIII centers and studied their magnetic interactions. The linearly fused Fe(III)Cl porphyrin trimers exhibit nearest-neighbor and second-neighbor couplings of the same sign and order of magnitude (J12 = -24.3 GHz; J13 = -10.8 GHz) between spin centers at 0.84 and 1.7 nm separation, respectively. These antiferromagnetic interactions lead to frustration, realizing a nontrivial Heisenberg spin system. The persistence of the long-range exchange coupling (J13) demonstrates that π-mediation is effective despite the spin polarization of the π-system induced by the central iron center. This work establishes a design principle for constructing nontrivial antiferromagnetic Heisenberg spin chains in which metal spin centers interact over several nanometers.
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