Late to the Party: Synthesis and Characterization of Tellurium and Selenium Half-Sandwich Complexes

Jerod M. Kieser, Leighton O. Jones, Madeleine C. Uible, Matthias Zeller, George C. Schatz, Suzanne C. Bart*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

3 Scopus citations


We report the synthesis and characterization of the first series of tellurium and selenium complexes featuring an ν5-cyclopentadienyl ligand. Reaction of Ph3TeX (X = Cl, S2CNEt2) with MCpR (M = Li, K; R = H, Me4, Me5) results in high yields of [Cp][TePh3] (1), [CpMe4][TePh3] (2), and [Cp*][TePh3] (3), respectively. Similarly, reaction of Ph3SeCl with LiCp and KCp∗ furnishes [Cp][SePh3] (4) and [Cp*][SePh3] (5). Each was characterized by X-ray crystallography, revealing similar ν5-coordination with little distortion from an idealized half-sandwich geometry, presumably from the remaining lone pair on tellurium and selenium. The Te-centroid distances are relatively long (1: 2.770(3), 2: 2.746(1), and 3: 2.733(1) Å), suggesting a mostly ionic interaction. Se-centroid distances (4: 2.748(3), 5: 2.707(2), 2.730(2) Å) were found to be surprisingly similar despite its smaller atomic radius. Compounds 2, 3, and 5 display rapid decomposition at room temperature, extruding a phenylated cyclopentadiene and the respective diphenylchalcogenide. The nature of bonding within these complexes was investigated through DFT methods and found to be primarily ionic in nature.

Original languageEnglish (US)
Pages (from-to)4104-4109
Number of pages6
Issue number24
StatePublished - Dec 27 2021

ASJC Scopus subject areas

  • Physical and Theoretical Chemistry
  • Organic Chemistry
  • Inorganic Chemistry


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