Effect of Coordination Environment on the Electronic Structure and Properties of Mo6-Based Systems: A Density Functional Treatment

L. M. Robinson, R. L. Bain, D. F. Shriver, D. E. Ellis*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

36 Scopus citations

Abstract

A comparison of first principles density functional (DV-Xa) electronic structure calculations for six clusters of the general form [Mo6Cli8La6]n(n = 0, - 1, −2) is presented. Substitution of different neutral and anionic axial ligands (La), such as Cl, Br, I, PR3, and 4, 4′-bipyridine, significantly affects calculated electronic structure and experimentally determined optical transitions of the clusters. In the extreme case, the model of two cluster units bridged by a 4, 4′-bipyridine ligand predicts a band-type structure with facile charge transport between metal cores. DV-Xa results also predict a closed-shell ground state configuration and a dipole-forbidden LUMO to HOMO transition for the [Mo6Cli8Ya6]2− (Y = Cl, Br, I) clusters, which is thought to cause the unusually long-lived excited states of these species. Effects of electronic relaxation, spin-spin, and spin-orbit coupling on the symmetry and energy of the excited state are discussed. Trends in HOMO/LUMO characteristics, net atomic charges, Mulliken populations, and density of states distributions are examined. General trends in predicted absorption energies are corroborated by experimental values, but more precise values will require study of excited state geometry.

Original languageEnglish (US)
Pages (from-to)5588-5596
Number of pages9
JournalInorganic chemistry
Volume34
Issue number22
DOIs
StatePublished - Oct 1 1995

ASJC Scopus subject areas

  • Physical and Theoretical Chemistry
  • Inorganic Chemistry

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