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A diuranium carbide cluster stabilized inside a C80 fullerene cage

Journal Article · · Nature Communications
Unsupported non-bridged uranium–carbon double bonds have long been sought after in actinide chemistry as fundamental synthetic targets in the study of actinide-ligand multiple bonding. Here we report that, utilizing Ih(7)-C80 fullerenes as nanocontainers, a diuranium carbide cluster, U=C=U, has been encapsulated and stabilized in the form of UCU@Ih(7)-C80. This endohedral fullerene was prepared utilizing the Krätschmer–Huffman arc discharge method, and was then co-crystallized with nickel(II) octaethylporphyrin (NiII-OEP) to produce UCU@Ih(7)-C80·[NiII-OEP] as single crystals. X-ray diffraction analysis reveals a cage-stabilized, carbide-bridged, bent UCU cluster with unexpectedly short uranium–carbon distances (2.03 Å) indicative of covalent U=C double-bond character. The quantum-chemical results suggest that both U atoms in the UCU unit have formal oxidation state of +5. The structural features of UCU@Ih(7)-C80 and the covalent nature of the U(f1)=C double bonds were further affirmed through various spectroscopic and theoretical analyses.
Research Organization:
Lawrence Berkeley National Laboratory (LBNL), Berkeley, CA (United States); State Univ. of New York, Buffalo, NY (United States)
Sponsoring Organization:
USDOE Office of Science (SC), Basic Energy Sciences (BES). Chemical Sciences, Geosciences & Biosciences Division
Grant/Contract Number:
AC02-05CH11231; SC0001136
OSTI ID:
1511585
Alternate ID(s):
OSTI ID: 1631596
Journal Information:
Nature Communications, Journal Name: Nature Communications Journal Issue: 1 Vol. 9; ISSN 2041-1723
Publisher:
Nature Publishing GroupCopyright Statement
Country of Publication:
United States
Language:
English

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Cited By (8)

Double dative bond between divalent carbon(0) and uranium journal November 2018
Purification of Uranium-based Endohedral Metallofullerenes (EMFs) by Selective Supramolecular Encapsulation and Release journal July 2018
Purification of Uranium-based Endohedral Metallofullerenes (EMFs) by Selective Supramolecular Encapsulation and Release journal July 2018
Propeller-Shaped Fe 4 and Fe 3 M Molecular Nanomagnets: A Journey from Crystals to Addressable Single Molecules: Propeller-Shaped Fe 4 and Fe 3 M Molecular Nanomagnets: A Journey from Crystals to Addressable Single Molecules journal January 2019
Small Cage Uranofullerenes: 27 Years after Their First Observation journal April 2019
Robust metal-pentagon interactions in the Th-based endohedral metallofullerenes revealed by DFT calculations journal October 2018
Highly selective encapsulation and purification of U-based C 78 -EMFs within a supramolecular nanocapsule journal January 2019
Trapping an unprecedented Ti 3 C 3 unit inside the icosahedral C 80 fullerene: a crystallographic survey journal January 2019


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