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Quantum entanglement between the spin states of a metal centre and radicalligands is suggested in an iron(II) [Fe(dipyvd)$_2$]$^{2+}$ compound (dipyvd =1-isopropyl-3,5-dipyridil-6-oxoverdazyl). Wavefunction \textit{ab initio}(Difference Dedicated Configuration Interaction, DDCI) inspections were carriedout to stress the versatility of local spin states. We named this phenonmenon\textit{excited state spinmerism}, in reference to our previous work (seeRoseiro et. al., ChemPhysChem 2022, e202200478) where we introduced the conceptof spinmerism as an extension of mesomerism to spin degrees of freedom. Theconstruction of localized molecular orbitals allows for a reading of thewavefunctions and projections onto the local spin states. The low-energyspectrum is well-depicted by a Heisenberg picture. A 60 cm$^{-1}$ ferromagneticinteraction is calculated between the radical ligands with the $S_{total} = 0$and $1$ states largely dominated by a local low-spin $S_{Fe} = 0$. In contrast,the higher-lying $S_{total} = 2$ states are superpositions of the local $S_{Fe}= 1$ (17%, 62%) and $S_{Fe} = 2$ (72%, 21%) spin states. Such mixing extendsthe traditional picture of a high-field $d^6$ Tanabe-Sugano diagram. Even inthe absence of spin-orbit coupling, the avoided crossing between differentlocal spin states is triggered by the field generated by radical ligands. Thispuzzling scenario emerges from versatile local spin states in compounds whichextend the traditional views in molecular magnetism.

Modifications of Tanabe-Sugano d$^6$ diagram induced by radical ligand field: ab initio inspection of a Fe(II)-verdazyl molecular complex