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Divalent and trivalent gas-phase coordination complexes of californium: Evaluating the stability of Cf(II)

  • Author(s): Dau, PD
  • Shuh, DK
  • Sturzbecher-Hoehne, M
  • Abergel, RJ
  • Gibson, JK
  • et al.

© 2016 The Royal Society of Chemistry. The divalent oxidation state is increasingly stable relative to the trivalent state for the later actinide elements, with californium the first actinide to exhibit divalent chemistry under moderate conditions. Although there is evidence for divalent Cf in solution and solid compounds, there are no reports of discrete complexes in which CfIIis coordinated by anionic ligands. Described here is the divalent Cf methanesulfinate coordination complex, CfII(CH3SO2)3-, prepared in the gas phase by reductive elimination of CH3SO2from CfIII(CH3SO2)4-. Comparison with synthesis of the corresponding Sm and Cm complexes reveals reduction of CfIIIand SmIII, and no evidence for reduction of CmIII. This reflects the comparative 3+/2+ reduction potentials: Cf3+(-1.60 V) ≈ Sm3+(-1.55 V) ≫ Cm3+(-3.7 V). Association of O2to the divalent complexes is attributed to formation of superoxides, with recovery of the trivalent oxidation state. The new gas-phase chemistry of californium, now the heaviest element to have been studied in this manner, provides evidence for CfIIcoordination complexes and similar chemistry of Cf and Sm.

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