A Comparative Fully Relativistic/Nonrelativistic First-Principles Xα-DVM and Photoelectron Spectroscopic Investigation of Electronic Structure in Homologous 4f and 5f Tris(η5-cyclopentadienyl)metal(IV) Alkoxide Complexes

Antonino Gulino, Santo Di Bella, Ignazio Fragalà*, Maurizio Casarin, Afif M. Seyam, Tobin J. Marks

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

16 Scopus citations

Abstract

The electronic structure of (η5-C5H5)3MOR (M = Ce, Th, U) complexes has been investigated by He I and He II UV photoelectron spectroscopy combined with SCF Xα-DVM calculations. Fully relativistic Dirac-Slater calculations were also carried out for the M = Th complex. The nonrelativistic calculations indicate that metal-ligand interactions involving the highest energy ligand orbitals involve primarily metal 5f orbitals while 6d admixtures are found for lower energy orbitals. The M-O bonding is both σ and π in nature and involves primarily metal 6d atomic orbitals. Evidence of a charge redistribution mechanism along the CH3→O→M→Cp3 direction provides a satisfactory explanation for the shortened M-O distances and strong propensity for nearly linear M-O-CH3 linkages observed in diffraction studies. The fully relativistic calculations show that metal d contributions are slightly underestimated at the nonrelativistic level. Such deviations do not, however, alter the overall description of the metal-ligand bonding. The nonrelativistic configuration of the metal center compares well with the relativistic data. Gas-phase ionization energies can be accurately and comparably evaluated at the computationally more efficient nonrelativistic level if optimized basis sets and potential representations are used.

Original languageEnglish (US)
Pages (from-to)3873-3879
Number of pages7
JournalInorganic chemistry
Volume32
Issue number18
DOIs
StatePublished - 1993

ASJC Scopus subject areas

  • Physical and Theoretical Chemistry
  • Inorganic Chemistry

Fingerprint Dive into the research topics of 'A Comparative Fully Relativistic/Nonrelativistic First-Principles Xα-DVM and Photoelectron Spectroscopic Investigation of Electronic Structure in Homologous 4f and 5f Tris(η<sup>5</sup>-cyclopentadienyl)metal(IV) Alkoxide Complexes'. Together they form a unique fingerprint.

Cite this