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Bonding properties of Eu and Am complexes with chalcogen donor ligands exhibiting the same coordination geometries

Kaneko, Masashi   ; Watanabe, Masayuki   ; Miyashita, Sunao*; Nakashima, Satoru*

In this study, we discussed the stability and bonding property of Eu and Am complexes with imidodiphosphinic acid which shows the same coordination geometry for both O- and S-donor ligands. We performed the geometry optimizations by referring to single crystal structures as their starting coordinates and calculated the Gibbs energy for the stabilization toward the hydrated complex. As the results, the calculated Eu and Am complexes have the same coordination geometries for O- and S-donor complexes and reproduced the metal-ligand distances of single crystal structures. The results of Gibbs energy indicated that O-donor preferably coordinates to Eu over Am, meanwhile, S-donor selectively coordinates to Am over Eu.

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