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1. Crystal structures of two copper(I)–6,6′-dimethyl-2,2′-bipyridyl (dmbpy) compounds, [Cu(dmbpy) ₂ ] ₂ [ M F ₆ ]· x H ₂ O ( M = Zr, Hf; x = 1.134, 0.671)

   https://doi.org/10.1107/S2056989021007295  

   Wang, Yiran ; Nisbet, Matthew L. ; Poeppelmeier, Kenneth R. ( August 2021 , Acta Crystallographica Section E Crystallographic Communications)

   The syntheses and crystal structures of two bimetallic molecular compounds, namely, bis[bis(6,6′-dimethyl-2,2′-bipyridine)copper(I)] hexafluoridozirconate(IV) 1.134-hydrate, [Cu(dmbpy) 2 ] 2 [ZrF 6 ]·1.134H 2 O (dmbpy = 6,6′-dimethyl-2,2′-bipyridyl, C 12 H 12 N 2 ), (I), and bis[bis(6,6′-dimethyl-2,2′-bipyridine)copper(I)] hexafluoridohafnate(IV) 0.671-hydrate, [Cu(dmbpy) 2 ] 2 [HfF 6 ]·0.671H 2 O, (II), are reported. Apart from a slight site occupany difference for the water molecule of crystallization, compounds (I) and (II) are isostructural, featuring isolated tetrahedral cations of copper(I) ions coordinated by two dmbpy ligands and centrosymmetric, octahedral anions of fluorinated early transition metals. The tetrahedral environments of the copper complexes are distorted owingmore »to the steric effects of the dmbpy ligands. The extended structures are built up through Coulombic interactions between cations and anions and π–π stacking interactions between heterochiral Δ- and Λ-[Cu(dmbpy) 2 ] + complexes. A comparison between the title compounds and other [Cu(dmbpy) 2 ] + compounds with monovalent and bivalent anions reveals a significant influence of the cation-to-anion ratio on the resulting crystal packing architectures, providing insights for future crystal design of distorted tetrahedral copper compounds.« less
2. Synthesis, Characterization, and Electrochemistry of the Homoleptic f Element Ketimide Complexes [Li] ₂ [M(N═C ^t BuPh) ₆ ] (M = Ce, Th)

   https://doi.org/10.1021/acs.inorgchem.9b01428  

   Assefa, Mikiyas K. ; Sergentu, Dumitru-Claudiu ; Seaman, Lani A. ; Wu, Guang ; Autschbach, Jochen ; Hayton, Trevor W. ( September 2019 , Inorganic Chemistry)
3. From antiferromagnetic and hidden order to Pauli paramagnetism in U M ₂ Si ₂ compounds with 5 f electron duality

   https://doi.org/10.1073/pnas.2005701117  

   Amorese, Andrea ; Sundermann, Martin ; Leedahl, Brett ; Marino, Andrea ; Takegami, Daisuke ; Gretarsson, Hlynur ; Gloskovskii, Andrei ; Schlueter, Christoph ; Haverkort, Maurits W. ; Huang, Yingkai ; et al ( December 2020 , Proceedings of the National Academy of Sciences)

   Using inelastic X-ray scattering beyond the dipole limit and hard X-ray photoelectron spectroscopy we establish the dual nature of the U 5 f electrons in U M 2 S i 2 (M = Pd, Ni, Ru, Fe), regardless of their degree of delocalization. We have observed that the compounds have in common a local atomic-like state that is well described by the U 5 f 2 configuration with the Γ 1 ( 1 ) and Γ 2 quasi-doublet symmetry. The amount of the U 5 f 3 configuration, however, varies considerably across the U M 2 S i 2 series,more »indicating an increase of U 5f itineracy in going from M = Pd to Ni to Ru and to the Fe compound. The identified electronic states explain the formation of the very large ordered magnetic moments in U P d 2 S i 2 and U N i 2 S i 2 , the availability of orbital degrees of freedom needed for the hidden order in U R u 2 S i 2 to occur, as well as the appearance of Pauli paramagnetism in U F e 2 S i 2 . A unified and systematic picture of the U M 2 S i 2 compounds may now be drawn, thereby providing suggestions for additional experiments to induce hidden order and/or superconductivity in U compounds with the tetragonal body-centered T h C r 2 S i 2 structure.« less
4. KELT-24b: A 5 M _J Planet on a 5.6 day Well-aligned Orbit around the Young V = 8.3 F-star HD 93148

   https://doi.org/10.3847/1538-3881/ab4136  

   Rodriguez, Joseph E. ; Eastman, Jason D. ; Zhou, George ; Quinn, Samuel N. ; Beatty, Thomas G. ; Penev, Kaloyan ; Johnson, Marshall C. ; Cargile, Phillip A. ; Latham, David W. ; Bieryla, Allyson ; et al ( November 2019 , The Astronomical Journal)
5. Mild Hydrothermal Synthesis of the Complex Hafnium-Containing Fluorides Cs ₂ [M(H ₂ O) ₆ ][Hf ₂ F ₁₂ ] (M = Ni, Co, Zn), CuHfF ₆ (H ₂ O) ₄ , and Cs ₂ Hf ₃ Mn ₃ F ₂₀ Based on HfF ₇ and HfF ₆ Coordination Polyhedra

   https://doi.org/10.1021/acs.inorgchem.9b01958  

   Ayer, Gyanendra B. ; Klepov, Vladislav V. ; Smith, Mark D. ; zur Loye, Hans-Conrad ( September 2019 , Inorganic Chemistry)