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1. J ‐modulated ¹⁹ F‐ and ¹ H‐detected dual‐optimized inverted ¹ J _CC 1,n‐ADEQUATE: A universal ADEQUATE experiment

   https://doi.org/10.1002/mrc.5324  

   Crouch, Ronald C; Pelmuş, Marius; Raab, Jeffrey G; Tischenko, Evgeny; Frey, Michael; Wang, Yunyi; Reibarkh, Mikhail; Williamson, R Thomas; Martin, Gary E (March 2023, Magnetic Resonance in Chemistry)

   Abstract The recently reported¹⁹F‐detected dual‐optimized inverted¹J_CC1,n‐ADEQUATE experiment and the previously reported¹H‐detected version have been modified to incorporateJ‐modulation, making it feasible to acquire all 1,1‐ and 1,n‐ADEQUATE correlations as well as¹J_CCandⁿJ_CChomonuclear scalar couplings in a single experiment. The experiments are demonstrated usingN,N‐dimethylamino‐2,5,6‐trifluoro‐3,4‐phthalonitrile andN,N‐dimethylamino‐3,4‐phthalonitrile. 

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2. Dinitrogen activation at chromium by photochemically induced Cr^II–C bond homolysis

   https://doi.org/10.1039/d4cc02387k  

   Duletski, Olivia L; Platz, Duncan; Pollock, Charlie J; Mosquera, Martín A; Arulsamy, Navamoney; Mock, Michael T (June 2024, Chemical Communications)

   Exposure of (POCOP^tBu)Cr(Bn) to 427 nm blue light under 1 atm N₂ promoted Cr–C_Bn bond homolysis and led to N₂ activation forming [(POCOP^tBu)Cr]₂(μ-N₂). 

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3. The ⁴¹ Ar(n,y) ⁴² Ar reaction

   https://doi.org/10.1051/epjconf/202328401037  

   Sahoo, R. N.; Paul, M.; Köster, U.; Scott, R.; Tessler, M.; Zylstra, A.; Avila, M. L.; Dickerson, C.; Jayatissa, H.; Kohen, M.S.; et al (January 2023, EPJ Web of Conferences)

   Mattoon, C.M.; Vogt, R.; Escher, J.; Thompson, I. (Ed.)

   The cross-section of the thermal neutron capture⁴¹Ar(n,γ)⁴²Ar(t_1/2=32.9 y) reaction was measured by irradiating a⁴⁰Ar sample at the high-flux reactor of Institut Laue-Langevin (ILL) Grenoble, France. The signature of the two-neutron capture has been observed by measuring the growth curve and identifying the 1524.6 keV γ-lines of the shorter-lived⁴²K(12.4 h) β⁻daughter of⁴²Ar. Our preliminary value of the⁴¹Ar(n,γ)⁴²Ar thermal cross section is 240(80) mb at 25.3 meV. For the first time, direct counting of⁴²Ar was performed using the ultra-high sensitivity technique of noble gas accelerator mass spectrometry (NOGAMS) at Argonne National Laboratory, USA. 

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4. Critical Role of Li ⁺ ··· Li ⁺ Distance and Anion Restriction in Conductivity and Lithium‐Ion Transference Number of Molecular Crystals for Solid State Electrolytes

   https://doi.org/10.1002/aenm.202503433  

   Paul, Shujit Chandra; Zdilla, Michael J; Wunder, Stephanie L (November 2025, Advanced Energy Materials)

   Abstract Insights into structure‐conductivity mechanisms are investigated for a series of six (dinitrile)₂LiPF₆ molecular crystals with varied alkyl chain lengths, N≡C─(CH₂)_n─C≡N, n  = 2, 3, 4, 5, 6, and 2Me‐glutaronitrile. The molecular crystals have separate Li⁺ and channels, with the Li⁺ions weakly coordinated by four ─C≡N groups. The following correlations are observed: i) shorter Li⁺⋯ Li⁺ hopping distances (5.72–8.08 Å) increase ionic conductivity (3.1 × 10⁻⁴–0.15 × 10⁻⁴ S cm⁻¹ at 25 °C) for all (dinitrile)₂LiPF₆; ii) when there are unrestricted anion channels, the lithium ion transference number increases ( = 0.39–0.62) as the void volume (565–250 ų) and Li⁺⋯ Li⁺ hopping distance (7.15–5.72 Å) decrease, since a greater fraction of the charge is contributed by the Li⁺ions; this correlates with n= 2, 4, 5, 6; iii) the exceptions are Gln (n  = 3) and 2Me‐Gln, where there are restricted channels for anion migration, and in this case: iv) conductivity decreases (0.57–0.15 × 10⁻⁴ S cm⁻¹ at 25 °C), since contributions to the conductivity from anion migration decrease, but v) increases (0.64–0.7) since a greater fraction of the charge is carried by the Li⁺ ions. 

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5. Ynamide and Azaalleneyl. Acid‐Base Promoted Chelotropic and Spin‐State Rearrangements in a Versatile Heterocumulene [(Ad)NCC( ^t Bu)] ⁻

   https://doi.org/10.1002/anie.202401433  

   Russell, John_B; Jafari, Mehrafshan_G; Kim, Jun‐Hyeong; Pudasaini, Bimal; Ozarowski, Andrew; Telser, Joshua; Baik, Mu‐Hyun; Mindiola, Daniel_J (April 2024, Angewandte Chemie International Edition)

   Abstract We introduce the heterocumulene ligand [(Ad)NCC(^tBu)]⁻(Ad=1‐adamantyl (C₁₀H₁₅),^tBu=tert‐butyl, (C₄H₉)), which can adopt two forms, the azaalleneyl and ynamide. This ligand platform can undergo a reversible chelotropic shift using Brønsted acid‐base chemistry, which promotes an unprecedented spin‐state change of the [V^III] ion. These unique scaffolds are prepared via addition of 1‐adamantyl isonitrile (C≡NAd) across the alkylidyne in complexes [(BDI)V≡C^tBu(OTf)] (A) (BDI⁻=ArNC(CH₃)CHC(CH₃)NAr), Ar=2,6‐ⁱPr₂C₆H₃) and [(dBDI)V≡C^tBu(OEt₂)] (B) (dBDI²⁻=ArNC(CH₃)CHC(CH₂)NAr). ComplexAreacts with C≡NAd, to generate the high‐spin [V^III] complex with a κ¹‐N‐ynamide ligand, [(BDI)V{κ¹‐N‐(Ad)NCC(^tBu)}(OTf)] (1). Conversely,Breacts with C≡NAd to generate a low‐spin [V^III] diamagnetic complex having a chelated κ²‐C,N‐azaalleneyl ligand, [(dBDI)V{κ²‐N,C‐(Ad)NCC(^tBu)}] (2). Theoretical studies have been applied to better understand the mechanism of formation of2and the electronic reconfiguration upon structural rearrangement by the alteration of ligand denticity between1and2. 

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