Weak metal-metal bonding in small manganese cluster ions, Mn N + (N≤7)

Kensuke Tono, Akira Terasaki, Toshiaki Ohta, Tamotsu Kondow

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14 Citations (Scopus)

Abstract

The binding energies of manganese cluster ions MnN+ (N=5-7) were determined by the photodissociation experiments in the near-infrared and visible-photon-energy ranges. The bond dissociation energies of MnN+, D0 (Mn N-1 + ⋯Mn), were obtained to be 1.70±0.08, 1.04±0.10, and 1.46±0.11 eV, respectively, for N=5, 6, and 7 from the threshold energies for the two-atom loss processes and the bond dissociation energies of Mn3+ and Mn4+ reported previously [A. Terasaki, J. Chem. Phys. 117, 7520 (2002)]. Correspondingly, binding energies per atom are obtained to be 0.99±0.03, 1.00±0.03, and 1.06±0.03 eVat. for N=5, 6, and 7, respectively. A gradual increase in the binding energy from N=2 to N=7 shows an increasing contribution of nonbonding 3d orbitals to the bonding via weak hybridization with valence 4s orbitals as the cluster size increases. These binding energies per atom are still much smaller than the bulk cohesive energy of manganese (2.92 eVat.), and this finding indicates exceptionally weak metal-metal bonds in this size range.

Original languageEnglish
Article number174314
JournalJournal of Chemical Physics
Volume123
Issue number17
DOIs
Publication statusPublished - Nov 1 2005
Externally publishedYes

All Science Journal Classification (ASJC) codes

  • Physics and Astronomy(all)
  • Physical and Theoretical Chemistry

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