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Title: Size-Dependent Ligand Quenching of Ferromagnetism in Co3 (benzene)n+ Clusters Studied with X-ray Magnetic Circular Dichroism Spectroscopy

Journal Article · · Journal of Physical Chemistry Letters
 [1];  [2];  [3];  [4];  [4];  [4];  [5];  [6];  [7];  [3];  [5];  [1]
  1. Univ. of Georgia, Athens, GA (United States). Dept. of Chemistry
  2. Helmholtz-Zentrum Berlin für Materialien und Energie, Berlin (Germany); Univ. of Freiburg (Germany)
  3. Univ. of Minnesota, Minneapolis, MN (United States). Dept. of Chemistry, Chemical Theory Center, and the Supercomputing Inst.
  4. Helmholtz-Zentrum Berlin für Materialien und Energie, Berlin (Germany); Technische Univ. Berlin (Germany). Inst. fur Optik und Atomare Physik (IOAP)
  5. Helmholtz-Zentrum Berlin für Materialien und Energie, Berlin (Germany)
  6. Genesis Research Inst. (Japan); Department of Chemistry, Kyushu Univ. (Japan)
  7. Univ. of Freiburg (Germany)

Cobalt–benzene cluster ions of the form Co3(bz)n+ (n = 0–3) were produced in the gas phase, mass-selected, and cooled in a cryogenic ion trap held at 3–4 K. To explore ligand effects on cluster magnetic moments, these species were investigated with X-ray absorption spectroscopy (XAS) and X-ray magnetic circular dichroism (XMCD) spectroscopy. XMCD spectra yield both the spin and orbital angular momenta of these clusters. Co3+ has a spin magnetic moment of μS = 6 μB and an orbital magnetic moment of μL = 3 μB. Co3(bz)+ and Co3(bz)2+ complexes were found to have spin and orbital magnetic moments identical to the values for ligand-free Co3+. However, coordination of the third benzene to form Co3(bz)3+ completely quenches the high spin state of the system. Density functional theory calculations elucidate the spin states of the Co3(bz)n+ species as a function of the number of attached benzene ligands, explaining the transition from septet to singlet for n = 0 → 3.

Research Organization:
Energy Frontier Research Centers (EFRC) (United States). Energy Frontier Research Center for Inorganometallic Catalyst Design (ICDC)
Sponsoring Organization:
USDOE Office of Science (SC), Basic Energy Sciences (BES)
Grant/Contract Number:
SC0012702; FA9550-15-1-0088; AC02-05CH11231; UE52-PGM
OSTI ID:
1388602
Journal Information:
Journal of Physical Chemistry Letters, Vol. 7, Issue 22; Related Information: ICDC partners with University of Minnesota(lead); Argonne National Laboratory; Clemson University; Dow Chemical Company; Northwestern University; Pacific Northwest National Laboratory; University of California Davis; University of Washington; ISSN 1948-7185
Publisher:
American Chemical SocietyCopyright Statement
Country of Publication:
United States
Language:
English
Citation Metrics:
Cited by: 22 works
Citation information provided by
Web of Science

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Identification of Active Sites and Structural Characterization of Reactive Ionic Intermediates by Cryogenic Ion Trap Vibrational Spectroscopy journal January 2019
Experimental and theoretical 2p core-level spectra of size-selected gas-phase aluminum and silicon cluster cations: chemical shifts, geometric structure, and coordination-dependent screening journal January 2019
Access to the Bis-benzene Cobalt(I) Sandwich Cation and its Derivatives: Synthons for a “Naked” Cobalt(I) Source? journal June 2018
Ab initio study of ultrafast laser-induced spin flip, spin-flip transfer, and spin crossover in Co m Bz n + / 0 clusters ( m , n = 1 , 2 ) journal September 2018
Large orbital magnetic moments of small, free cobalt cluster ions Co${_n^+}$ with n ${ \leqslant 9}$ journal October 2018
Access to the Bis-benzene Cobalt(I) Sandwich Cation and its Derivatives: Synthons for a “Naked” Cobalt(I) Source? journal June 2018