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1. Introduction of a (Ph 3 P) 2 Pt group into the rim of an open-cage fullerene by breaking a carbon–carbon bond

   https://doi.org/10.1039/D1CC04336F  

   Gralinski, Steven R. ; Roy, Mrittika ; Baldauf, Lilia M. ; Olmstead, Marilyn M. ; Balch, Alan L. ( October 2021 , Chemical Communications)

   Treatment of an open-cage fullerene, designated as MMK-9, with (Ph 3 P) 4 Pt in toluene solution at room temperature allows a (PPh 3 ) 2 Pt unit to be incorporated into the rim of the cage so that it becomes an integral part of the carbon cage skeleton. The structure of the adduct has been determined by single crystal X-ray diffraction and reveals that the platinum atom has planar PtC 2 P 2 coordination, rather than the usual η 2 -bonding to an intact C–C double bond of the fullerene. 

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2. H 2 , HD, and D 2 in the small cage of structure II clathrate hydrate: Vibrational frequency shifts from fully coupled quantum six-dimensional calculations of the vibration-translation-rotation eigenstates

   https://doi.org/10.1063/1.5090573  

   Lauvergnat, David ; Felker, Peter ; Scribano, Yohann ; Benoit, David M. ; Bačić, Zlatko ( April 2019 , The Journal of Chemical Physics)
3. Crystallographic Characterization of U@C 2n (2 n = 82–86): Insights about Metal–Cage Interactions for Mono-metallofullerenes

   https://doi.org/10.1021/jacs.1c06833  

   Yao, Yang-Rong ; Roselló, Yannick ; Ma, Lei ; Puente Santiago, Alain Rafael ; Metta-Magaña, Alejandro ; Chen, Ning ; Rodríguez-Fortea, Antonio ; Poblet, Josep M. ; Echegoyen, Luis ( September 2021 , Journal of the American Chemical Society)
4. Syntheses, Structures, Reactivities, and Dynamic Properties of Gyroscope-like Complexes Consisting of Rh(CO)(X) or Rh(CO) 2 (I) Rotators and Cage-like Trans Aliphatic Dibridgehead Diphosphine Stators

   https://doi.org/10.1021/acs.organomet.1c00708  

   Estrada, Alexander L. ; Wang, Leyong ; Bhuvanesh, Nattamai ; Hampel, Frank ; Gladysz, John A. ( March 2022 , Organometallics)
5. Iron in a Cage: Fixation of a Fe(II)tpy 2 Complex by Fourfold Interlinking

   https://doi.org/10.1002/ange.202006340  

   Brandl, Thomas ; Johannsen, Sven ; Häussinger, Daniel ; Suryadevara, Nithin ; Prescimone, Alessandro ; Bernhard, Stefan ; Gruber, Manuel ; Ruben, Mario ; Berndt, Richard ; Mayor, Marcel ( June 2020 , Angewandte Chemie)

   The coordination sphere of the Fe(II) terpyridine complex1is rigidified by fourfold interlinking of both terpyridine ligands. Profiting from an octa‐aldehyde precursor complex, the ideal dimensions of the interlinking structures are determined by reversible Schiff‐base formation, before irreversible Wittig olefination provided the rigidified complex. Reversed‐phase HPLC enables the isolation of the all‐transisomer of the Fe(II) terpyridine complex1, which is fully characterized. While temperature independent low‐spin states were recorded with superconducting quantum interference device (SQUID) measurements for both, the open precursor8and the interlinked complex1, evidence of the increased rigidity of the ligand sphere in1was provided by proton T₂relaxation NMR experiments. The ligand sphere fixation in the macrocyclized complex1even reaches a level resisting substantial deformation upon deposition on an Au(111) surface, as demonstrated by its pristine form in a low temperature ultra‐high vacuum scanning tunneling microscope experiment.

    

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