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Scalable, inexpensive, one-pot, facile synthesis of crystalline two-dimensional birnessite flakes

https://doi.org/10.1016/j.matt.2022.05.038

Badr, Hussein O.; Montazeri, Kiana; El-Melegy, Tarek; Natu, Varun; Carey, Michael; Gawas, Ramchandra; Phan, Phu; Qian, Qian; Li, Christopher Y.; Wiedwald, Ulf; et al (July 2022, Matter)

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Bottom-up, scalable synthesis of anatase nanofilament-based two-dimensional titanium carbo-oxide flakes

https://doi.org/10.1016/j.mattod.2021.10.033

Badr, Hussein O.; El-Melegy, Tarek; Carey, Michael; Natu, Varun; Hassig, Mary Q.; Johnson, Craig; Qian, Qian; Li, Christopher Y.; Kushnir, Kateryna; Colin-Ulloa, Erika; et al (April 2022, Materials Today)

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[UF ₆ ] ²⁻ : A Molecular Hexafluorido Actinide(IV) Complex with Compensating Spin and Orbital Magnetic Moments

https://doi.org/10.1002/anie.201905056

Pedersen, Kasper S.; Meihaus, Katie R.; Rogalev, Andrei; Wilhelm, Fabrice; Aravena, Daniel; Amoza, Martín; Ruiz, Eliseo; Long, Jeffrey R.; Bendix, Jesper; Clérac, Rodolphe (August 2019, Angewandte Chemie International Edition)

Abstract The first structurally characterized hexafluorido complex of a tetravalent actinide ion, the [UF₆]²⁻anion, is reported in the (NEt₄)₂[UF₆]⋅2 H₂O salt (1). The weak magnetic response of1results from both U^IVspin and orbital contributions, as established by combining X‐ray magnetic circular dichroism (XMCD) spectroscopy and bulk magnetization measurements. The spin and orbital moments are virtually identical in magnitude, but opposite in sign, resulting in an almost perfect cancellation, which is corroborated by ab initio calculations. This work constitutes the first experimental demonstration of a seemingly non‐magnetic molecular actinide complex carrying sizable spin and orbital magnetic moments.
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Access to Heteroleptic Fluorido‐Cyanido Complexes with a Large Magnetic Anisotropy by Fluoride Abstraction

https://doi.org/10.1002/anie.201914934

Liu, Jun‐Liang; Pedersen, Kasper S.; Greer, Samuel M.; Oyarzabal, Itziar; Mondal, Abhishake; Hill, Stephen; Wilhelm, Fabrice; Rogalev, Andrei; Tressaud, Alain; Durand, Etienne; et al (April 2020, Angewandte Chemie International Edition)

Abstract Silicon‐mediated fluoride abstraction is demonstrated as a means of generating the first fluorido‐cyanido transition metal complexes. This new synthetic approach is exemplified by the synthesis and characterization of the heteroleptic complexes,trans‐[M^IVF₄(CN)₂]²⁻(M=Re, Os), obtained from their homoleptic [M^IVF₆]²⁻parents. As shown by combined high‐field electron paramagnetic resonance spectroscopy and magnetization measurements, the partial substitution of fluoride by cyanide ligands leads to a marked increase in the magnetic anisotropy oftrans‐[ReF₄(CN)₂]²⁻as compared to [ReF₆]²⁻, reflecting the severe departure from an ideal octahedral (O_hpoint group) ligand field. This methodology paves the way toward the realization of new heteroleptic transition metal complexes that may be used as highly anisotropic building‐blocks for the design of high‐performance molecule‐based magnetic materials.
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