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1. Evaluating electrochemical accessibility of 4f ⁿ 5d ¹ and 4f ⁿ⁺¹ Ln( ii ) ions in (C ₅ H ₄ SiMe ₃ ) ₃ Ln and (C ₅ Me ₄ H) ₃ Ln complexes

   https://doi.org/10.1039/D1DT02427B  

   Trinh, Michael T.; Wedal, Justin C.; Evans, William J. (October 2021, Dalton Transactions)

   The reduction potentials (reported vs. Fc + /Fc) for a series of Cp′ 3 Ln complexes (Cp′ = C 5 H 4 SiMe 3 , Ln = lanthanide) were determined via electrochemistry in THF with [ n Bu 4 N][BPh 4 ] as the supporting electrolyte. The Ln( iii )/Ln( ii ) reduction potentials for Ln = Eu, Yb, Sm, and Tm (−1.07 to −2.83 V) follow the expected trend for stability of 4f 7 , 4f 14 , 4f 6 , and 4f 13 Ln( ii ) ions, respectively. The reduction potentials for Ln = Pr, Nd, Gd, Tb, Dy, Ho, Er, and Lu, that form 4f n 5d 1 Ln( ii ) ions ( n = 2–14), fall in a narrow range of −2.95 V to −3.14 V. Only cathodic events were observed for La and Ce at −3.36 V and −3.43 V, respectively. The reduction potentials of the Ln( ii ) compounds [K(2.2.2-cryptand)][Cp′ 3 Ln] (Ln = Pr, Sm, Eu) match those of the Cp′ 3 Ln complexes. The reduction potentials of nine (C 5 Me 4 H) 3 Ln complexes were also studied and found to be 0.05–0.24 V more negative than those of the Cp′ 3 Ln compounds. 

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2. Synthesis and Oxidation of Dirhenium C ₄ , C ₆ , and C ₈ Complexes of the Formula (η ⁵ -C ₅ Me ₅ )Re(NO)(PR ₃ )(C⋮C) _n (R ₃ P)(ON)Re(η ⁵ -C ₅ Me ₅ ) (R = 4-C ₆ H ₄ R‘, c-C ₆ H ₁₁ ):  In Search of Dications and Radical Cations with Enhanced Stabilities ^†

   https://doi.org/10.1021/om000961m  

   Meyer, Wayne E.; Amoroso, Angelo J.; Horn, Clemens R.; Jaeger, Monika; Gladysz, J. A. (March 2001, Organometallics)
3. Synthesis and Reactivity of Functionalized Dimethylgermyl Complexes of the Formula (η ⁵ -C ₅ H ₅ )Re(NO)(PPh ₃ )(GeMe ₂ X); Equilibria Involving the Dimethylgermylene Complex [(η ⁵ -C ₅ H ₅ )Re(NO)(PPh ₃ )(=GeMe ₂ )]• TfO ⁻

   https://doi.org/10.1080/10426509408037445  

   Lee, Kenneth E.; Gladysz, J. A. (February 1994, Phosphorus, Sulfur, and Silicon and the Related Elements)
4. Crystal structure of the [(THF)Cs(μ-η ⁵ :η ⁵ -Cp′) ₃ Yb] _n oligomer

   https://doi.org/10.1107/S2056989020008051  

   Huh, Daniel N.; Ziller, Joseph W.; Evans, William J. (July 2020, Acta Crystallographica Section E Crystallographic Communications)

   null (Ed.)

   The green compound poly[(tetrahydrofuran)tris[μ-η 5 :η 5 -1-(trimethylsilyl)cyclopentadienyl]caesium(I)ytterbium(II)], [CsYb(C 8 H 13 Si) 3 (C 4 H 8 O)] n or [(THF)Cs(μ-η 5 :η 5 -Cp′) 3 Yb II ] n was synthesized by reduction of a red THF solution of (C 5 H 4 SiMe 3 ) 3 Yb III with excess Cs metal and identified by X-ray diffraction. The compound crystallizes as a two-dimensional array of hexagons with alternating Cs I and Yb II ions at the vertices and cyclopentadienyl groups bridging each edge. This, based off the six-electron cyclopentadienyl rings occupying three coordination positions, gives a formally nine-coordinate tris(cyclopentadienyl) coordination environment to Yb and the Cs is ten-coordinate due to the three cyclopentadienyl rings and a coordinated molecule of THF. The complex comprises layers of Cs 3 Yb 3 hexagons with THF ligands and Me 3 Si groups in between the layers. The Yb—C metrical parameters are consistent with a 4 f 14 Yb II electron configuration. 

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5. High-Resolution X-ray Photoelectron Spectroscopy of Organometallic (C ₅ H ₄ SiMe ₃ ) ₃ Ln ^III and [(C ₅ H ₄ SiMe ₃ ) ₃ Ln ^II ] ^1– Complexes (Ln = Sm, Eu, Gd, Tb)

   https://doi.org/10.1021/jacs.1c06980  

   Huh, Daniel N.; Bruce, Jared P.; Ganesh Balasubramani, Sree; Ciccone, Sierra R.; Furche, Filipp; Hemminger, John C.; Evans, William J. (October 2021, Journal of the American Chemical Society)