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1. 3D Covalent Organic Framework as a Metastable Intermediate in the Formation of a Double-Stranded Helical Covalent Polymer

   https://doi.org/10.1021/jacs.3c04734  

   Wayment, Lacey J. ; Wang, Xubo ; Huang, Shaofeng ; McCoy, Matthew S. ; Chen, Hongxuan ; Hu, Yiming ; Jin, Yinghua ; Sharma, Sandeep ; Zhang, Wei ( July 2023 , Journal of the American Chemical Society)
2. When All You Have Is a Covalent Model of Bonding, Every Substance Is a Molecule: A Longitudinal Study of Student Enactment of Covalent and Ionic Bonding Models

   https://doi.org/10.1021/acs.jchemed.2c00188  

   Bowe, Kathleen A. ; Bauer, Christopher F. ; Wang, Ying ; Lewis, Scott E. ( August 2022 , Journal of Chemical Education)
3. Pattern of covalent and non‐covalent interactions within the pentaiodide anion in the structure of (3‐HOC 5 H 9 NH 2 )I 5

   https://doi.org/10.1002/zaac.202200039  

   Shestimerova, Tatiana A. ; Bykov, Andrey V. ; Kuznetsov, Alexey N. ; Grishko, Alexey Y. ; Wei, Zheng ; Dikarev, Evgeny V. ; Shevelkov, Andrei V. ( March 2022 , Zeitschrift für anorganische und allgemeine Chemie)

   3‐Hydroxypiperidinium pentaiodide was synthesized by a facile reaction in concentrated aqueous HI. Its crystal structure comprises 3‐hydroxypiperidinium cations and pentaiodide anions, the latter having geometry ofcis‐shaped chains composed of I₂and I₃⁻building units. The analysis of interatomic distances, Raman spectroscopy data, and results of DFT calculations, including non‐covalent interaction analysis, showed that the title compound exhibits a complex pattern of covalent and non‐covalent interactions. Those include I−I covalent bonds and I⋅⋅⋅I halogen bonds within the I₅⁻anion as well as (N)H⋅⋅⋅I and (O)H⋅⋅⋅I hydrogen bonds and even weaker (C)H⋅⋅⋅I van‐der‐Waals interactions between the cations and anions.

    

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4. Characterization of a strong covalent Th3+–Th3+ bond inside an Ih(7)-C80 fullerene cage

   https://doi.org/10.1038/s41467-021-22659-2  

   Zhuang, Jiaxin ; Morales-Martínez, Roser ; Zhang, Jiangwei ; Wang, Yaofeng ; Yao, Yang-Rong ; Pei, Cuiying ; Rodríguez-Fortea, Antonio ; Wang, Shuao ; Echegoyen, Luis ; de Graaf, Coen ; et al ( December 2021 , Nature Communications)

   null (Ed.)

   Abstract The nature of the actinide-actinide bonds is of fundamental importance to understand the electronic structure of the 5 f elements. It has attracted considerable theoretical attention, but little is known experimentally as the synthesis of these chemical bonds remains extremely challenging. Herein, we report a strong covalent Th-Th bond formed between two rarely accessible Th 3+ ions, stabilized inside a fullerene cage nanocontainer as Th 2 @ I h (7)-C 80 . This compound is synthesized using the arc-discharge method and fully characterized using several techniques. The single-crystal X-Ray diffraction analysis determines that the two Th atoms are separated by 3.816 Å. Both experimental and quantum-chemical results show that the two Th atoms have formal charges of +3 and confirm the presence of a strong covalent Th-Th bond inside I h (7)-C 80 . Moreover, density functional theory and ab initio multireference calculations suggest that the overlap between the 7 s /6 d hybrid thorium orbitals is so large that the bond still exists at Th-Th separations larger than 6 Å. This work demonstrates the authenticity of covalent actinide metal-metal bonds in a stable compound and deepens our fundamental understanding of f element metal bonds. 

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5. Dynamic Covalent Polymerization of Chalcogenide Hybrid Inorganic/Organic Polymer Resins with Norbornenyl Comonomers

   https://doi.org/10.1007/s13233-020-8136-7  

   Kwon, Minho ; Lee, Hongchan ; Lee, Seo-Hui ; Jeon, Heung Bae ; Oh, Min-Cheol ; Pyun, Jeffrey ; Paik, Hyun-jong ( October 2020 , Macromolecular Research)

   null (Ed.)