Extended Data Fig. 1: Outline of the complexes synthesized in this work.
From: Isolation and characterization of a californium metallocene
a, The known 1-M (M = Sm, Gd) complexes were chosen for their ionic radii similarities to Cf3+ (Sm, 0.958 Å; Gd, 0.938 Å; Cf, 0.95 Å). Complex 1-241Am was synthesized following prior methodology for 1-243Am to assess radiolytic effects. b, Complex 1-Dy was synthesized as Dy3+ (4f9) is valence isoelectronic to Cf3+ (5f9), and 1-Ho was synthesized as the ionic radius of Ho3+ (0.901 Å) is significantly smaller than that of Cf3+. c, Complexes 2-M (M = Gd, Dy) were synthesized as comparisons to 2-Cf and chosen for the metal having a similar ionic radius to Cf3+ (Gd) or for being valence isoelectronic (Dy). d, Eu3+ (0.947 Å) is a better ionic radius match to Cf3+ than Sm or Gd; however, we were unable to isolate 1-Eu using salt-metathesis protocols which instead led to reduction to a Eu2+ complex, 3.
