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1. 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)
2. Formation of the End-on Bound Lanthanide Dinitrogen Complexes [(R ₂ N) ₃ Ln–N═N–Ln(NR ₂ ) ₃ ] ^2– from Divalent [(R ₂ N) ₃ Ln] ^1– Salts (R = SiMe ₃ )

   https://doi.org/10.1021/jacs.0c01021  

   Ryan, Austin J.; Balasubramani, Sree ganesh; Ziller, Joseph W.; Furche, Filipp; Evans, William J. (May 2020, Journal of the American Chemical Society)

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3. 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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4. Solid-State End-On to Side-On Isomerization of (N═N) ^2– in {[(R ₂ N) ₃ Nd] ₂ N ₂ } ^2– (R = SiMe ₃ ) Connects In Situ Ln ^III (NR ₂ ) ₃ /K and Isolated [Ln ^II (NR ₂ ) ₃ ] ^1– Dinitrogen Reduction

   https://doi.org/10.1021/jacs.2c06716  

   Chung, Amanda B.; Rappoport, Dmitrij; Ziller, Joseph W.; Cramer, Roger E.; Furche, Filipp; Evans, William J. (September 2022, Journal of the American Chemical Society)
5. Lanthanide Identity Governs Guest‐Induced Dimerization in Ln ^III [15‐MC _N(L‐pheHA) ‐5]) ³⁺ Metallacrowns

   https://doi.org/10.1002/chem.202103263  

   Sgarlata, Carmelo; Schneider, Bernadette_L; Zito, Valeria; Migliore, Rossella; Tegoni, Matteo; Pecoraro, Vincent_L; Arena, Giuseppe (November 2021, Chemistry – A European Journal)

   Abstract Series of lanthanide‐containing metallic coordination complexes are frequently presented as structurally analogous, due to the similar chemical and coordinative properties of the lanthanides. In the case of chiral (Ln^III[15‐MC_N(L‐pheHA)‐5])³⁺metallacrowns (MCs), which are well established supramolecular hosts, the formation of dimers templated by a dicarboxylate guest (muconate) in solution of neutral pH is herein shown to have a unique dependence on the identity of the MC's central lanthanide. Calorimetric data and nuclear magnetic resonance diffusion studies demonstrate that MCs containing larger or smaller lanthanides as the central metal only form monomeric host‐guest complexes whereas analogues with intermediate lanthanides (for example, Eu, Gd, Dy) participate in formation of dimeric host‐guest‐host compartments. The driving force for the dimerization event across the series is thought to be a competition between formation of highly stable MCs (larger lanthanides) and optimally linked bridging guests (smaller lanthanides). 

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