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Title: Realization of Organocerium-Based Fullerene Molecular Materials Showing Mott Insulator-Type Behavior

Journal Article · · ACS Applied Materials and Interfaces
ORCiD logo [1]; ORCiD logo [2];  [3]; ORCiD logo [4];  [5];  [3];  [3];  [4]; ORCiD logo [4]; ORCiD logo [2]; ORCiD logo [2]; ORCiD logo [3]
  1. University of Pennsylvania, Philadelphia, PA (United States); École Polytechnique Fédérale de Lausanne (EPFL) (Switzerland); University of Rochester
  2. University at Buffalo, State University of New York, NY (United States)
  3. University of Pennsylvania, Philadelphia, PA (United States)
  4. Lawrence Berkeley National Laboratory (LBNL), Berkeley, CA (United States)
  5. University of Pennsylvania, Philadelphia, PA (United States); Ereztech Laboratories, Sheboygan Falls, WI (United States)

Abstract Electron-rich organocerium complexes (C5Me4H)3Ce and [(C5Me5)2Ce(ortho-oxa)], with redox potentials E1/2 = –0.82 V and E1/2 = –0.86 V versus Fc/Fc+ respectively, were reacted with fullerene (C60) in different stoichiometries to obtain molecular materials. Structurally characterized co-crystals: [(C5Me4H)3Ce]2•C60 (1) and [(C5Me5)2Ce(ortho-oxa)]3•C60 (2) of C60 with cerium-based rare earth molecular precursors are reported for the first time. The extent of charge transfer in 1 and 2 was evaluated using a series of physical measurements: FT-IR, Raman, solidstate UV-vis-NIR spectroscopy, X-ray absorption near edge structure (XANES) spectroscopy, and magnetic susceptibility measurements. The physical measurements indicate that 1 and 2 comprise the cerium(III) oxidation state with formally neutral C60 as a co-crystal in both cases. Pressure-dependent periodic density functional theory calculations were performed to study the electronic structure of 1. Inclusion of a Hubbard-U parameter removes Ce f states from the Fermi level, opens up a band gap, and stabilizes FM/AFM magnetic solutions that are isoenergetic because of the large distances between the Ce(III) cations. Furthermore, the electronic structure of this strongly correlated Mott insulator-type system is reminiscent of the well-studied Ce2O3.

Research Organization:
University of Rochester, NY (United States)
Sponsoring Organization:
USDOE Office of Science (SC), Basic Energy Sciences (BES). Chemical Sciences, Geosciences & Biosciences Division (CSGB)
Grant/Contract Number:
SC0020340; SC0020169
OSTI ID:
2457127
Journal Information:
ACS Applied Materials and Interfaces, Journal Name: ACS Applied Materials and Interfaces Journal Issue: 14 Vol. 16; ISSN 1944-8244
Publisher:
American Chemical Society (ACS)Copyright Statement
Country of Publication:
United States
Language:
English

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