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1. A Copper-Based Metal–Organic Framework for C 2 H 2 /CO 2 Separation

   https://doi.org/10.1021/acs.inorgchem.1c02552  

   Wang, Xiaodan ; Wang, Bin ; Zhang, Xin ; Xie, Yi ; Arman, Hadi ; Chen, Banglin ( December 2021 , Inorganic Chemistry)
2. Exfoliable Transition Metal Chalcogenide Semiconductor NbSe 2 I 2

   https://doi.org/10.1021/acs.inorgchem.3c03493  

   Qu, Kejian ; Zhang, Yue ; Peng, Cheng ; Riedel, Zachary W. ; Won, Juyeon ; Zhang, Rong ; Woods, Toby J. ; Devereaux, Tom ; van der Zande, Arend M. ; Shoemaker, Daniel P. ( January 2024 , Inorganic Chemistry)

   As the field of exfoliated van der Waals electronics grows to include complex heterostructures, the variety of available in-plane symmetries and geometries becomes increasingly valuable. In this work, we present an efficient chemical vapor transport synthesis of NbSe2I2 with the triclinic space group P1̅. This material contains Nb–Nb dimers and an in-plane crystallographic angle γ = 61.3°. We show that NbSe2I2 can be exfoliated down to few-layer and monolayer structures and use Raman spectroscopy to test the preservation of the crystal structure of exfoliated thin films. The crystal structure was verified by single-crystal and powder X-ray diffraction methods. Density functional theory calculations show triclinic NbSe2I2 to be a semiconductor with a band gap of around 1 eV, with similar band structure features for bulk and monolayer crystals. The physical properties of NbSe2I2 have been characterized by transport, thermal, optical, and magnetic measurements, demonstrating triclinic NbSe2I2 to be a diamagnetic semiconductor that does not exhibit any phase transformation below room temperature. 

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3. Electronic structure in a transition metal dipnictide TaAs 2

   https://doi.org/10.1088/1361-648X/ad04fc  

   Regmi, Sabin ; Huang, Cheng-Yi ; Khan, Mojammel A. ; Wang, Baokai ; Pradhan Sakhya, Anup ; Hosen, M. Mofazzel ; Thompson, Jesse ; Singh, Bahadur ; Denlinger, Jonathan D. ; Ishigami, Masahiro ; et al ( November 2023 , Journal of Physics: Condensed Matter)

   The family of transition-metal dipnictides has been of theoretical and experimental interest because this family hosts topological states and extremely large magnetoresistance (MR). Recently,${\mathrm{T}\mathrm{a}\mathrm{A}\mathrm{s}}_2$, a member of this family, has been predicted to support a topological crystalline insulating state. Here, by using high-resolution angle-resolved photoemission spectroscopy (ARPES), we reveal both closed and open pockets in the metallic Fermi surface (FS) and linearly dispersive bands on the ($\bar{2}01$) surface, along with the presence of extreme MR observed from magneto-transport measurements. A comparison of the ARPES results with first-principles computations shows that the linearly dispersive bands on the measured surface of${\mathrm{T}\mathrm{a}\mathrm{A}\mathrm{s}}_2$are trivial bulk bands. The absence of symmetry-protected surface state on the ($\bar{2}01$) surface indicates its topologically dark nature. The presence of open FS features suggests that the open-orbit fermiology could contribute to the extremely large MR of${\mathrm{T}\mathrm{a}\mathrm{A}\mathrm{s}}_2$.

    

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4. Mn substitution in the topological metal Zr 2 Te 2 P

   https://doi.org/10.1088/1361-648X/ac9770  

   Oladehin, O ; Feng, K ; Haddock, J W ; Galeano-Cabral, J ; Wei, K ; Xin, Y ; Latturner, S E ; Baumbach, R E ( October 2022 , Journal of Physics: Condensed Matter)

   Abstract Results are reported for Mn intercalated Zr 2 Te 2 P, where x-ray diffraction , energy dispersive spectroscopy, and transmission electron microscopy measurements reveal that the van der Waals bonded Te–Te layers are partially filled by Zr and Mn ions. This leads to the chemical formulas Zr 0.07 Zr 2 Te 2 P and Mn 0.06 Zr 0.03 Zr 2 Te 2 P for the parent and substituted compounds, respectively. The impact of the Mn ions is seen in the anisotropic magnetic susceptibility, where Curie–Weiss fits to the data indicate that the Mn ions are in the divalent state. Heat capacity and electrical transport measurements reveal metallic behavior, but the electronic coefficient of the heat capacity ( γ Mn ≈ 36.6 mJ (mol·K 2 ) −1 ) is enhanced by comparison to that of the parent compound. Magnetic ordering is seen at T M ≈ 4  K, where heat capacity measurements additionally show that the phase transition is broad, likely due to the disordered Mn distribution. This transition also strongly reduces the electronic scattering seen in the normalized electrical resistance. These results show that Mn substitution simultaneously introduces magnetic interactions and tunes the electronic state, which improves prospects for inducing novel behavior in Zr 2 Te 2 P and the broader family of ternary tetradymites. 

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5. Alkali Metal Intercalation and Reduction of Layered WO 2 Cl 2

   https://doi.org/10.1021/acs.chemmater.0c03270  

   Smith, Andrew I. ; Wladkowski, Henry V. ; Hecht, Zachary H. ; She, Yuqi ; Kattel, Subash ; Samarawickrama, Piumi I. ; Rich, Sarah R. ; Murphy, Joseph R. ; Tian, Jifa ; Ackerman, John F. ; et al ( December 2020 , Chemistry of Materials)

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