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1. Multisite Ligand Noninnocence of (Cp ^N3 )Fe(CO) ₃ ⁺ with Exogenous Hydride Donors: Kinetics and Mechanism

   https://doi.org/10.1021/acs.organomet.4c00137  

   VanderWeide, Andrew I; Neugebauer, Hagen; Goel, Bhumika; Tresp, David S; Pena, Deuris; Grimme, Stefan; Hansen, Andreas; Prokopchuk, Demyan E (August 2024, Organometallics)
2. “Catch and release” of the Cp ^N3 ligand using cobalt: dissociation, protonation, and C–H bond thermochemistry

   https://doi.org/10.1039/D4DT01560F  

   Luhach, Sanju; Lalancette, Roger A; Prokopchuk, Demyan E (January 2024, Dalton Transactions)

   Coordination of the amine-rich Cp^N3ligand to cobalt is reported. Ligand displacement leads to ligand protonation and evaluation of the metal-free C–H bond thermochemistry, revealing a weak homolytic C–H bond dissociation free energy (52 kcal mol⁻¹). 

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3. 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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4. Identification of an X-Band Clock Transition in Cp′ ₃ Pr ^– Enabled by a 4f ² 5d ¹ Configuration

   https://doi.org/10.1021/jacs.3c12725  

   Smith, Patrick_W; Hrubý, Jakub; Evans, William_J; Hill, Stephen; Minasian, Stefan_G (February 2024, Journal of the American Chemical Society)
5. Synthesis and Crystallographic Characterization of a Reduced Bimetallic Yttrium ansa -Metallocene Hydride Complex, [K(crypt)][(μ-Cp ^An )Y(μ-H)] ₂ (Cp ^An = Me ₂ Si[C ₅ H ₃ (SiMe ₃ )-3] ₂ ), with a 3.4 Å Yttrium–Yttrium Distance

   https://doi.org/10.1021/jacs.3c01405  

   Wedal, Justin C.; Anderson-Sanchez, Lauren M.; Dumas, Megan T.; Gould, Colin A.; Beltrán-Leiva, María J.; Celis-Barros, Cristian; Páez-Hernández, Dayán; Ziller, Joseph W.; Long, Jeffrey R.; Evans, William J. (May 2023, Journal of the American Chemical Society)