Synthesis and characterization of tantalum-based early-late heterobimetallic complexes supported by 2-(diphenylphosphino)pyrrolide ligands

Peter L. Dunn, Evan P. Beaumier, Ian A. Tonks

Research output: Contribution to journalArticlepeer-review

4 Scopus citations

Abstract

The synthesis of the metalloligand Ta(κ2-NP)3Cl2 (NP = 2-diphenylphosphinopyrrolide) and its coordination chemistry with group 9 and 10 metals is reported. Treatment of Ta(κ2-NP)3Cl2 with group 9 and 10 metals resulted in clean formation of the heterobimetallic complexes Cl2Ta(μ2-NP)3M (M = Ni (2), Pd (3)) or Cl2Ta(μ2-NP)3MCl (M = Rh (4), Ir (5)). Each pair of complexes is isostructural and contains three phosphinopyrrolide ligands that bridge the metal centers. The d10 or d8 complexes are all diamagnetic and X-ray crystallographic analysis reveals similarly short metal-metal distances, ranging from 2.2979(5) Å to 2.4366(2) Å. Despite the similar bonding metrics in 2–5, treatment with an L type donor (2,6-dimethylphenylisocyanide (CNXylyl)) reveals 3 different coordination geometries in TaNi(CNXylyl) (6), TaPd(CNXylyl) (7), and TaIr(CNXylyl) (8). While complexes 6, 7, and 8 all bind the isocyanide at the late metal, ligand rearrangements are observed in the first row complex 6. Complex 7 binds the isocyanide in the axial position while equatorial binding is observed in 8. All isocyanide adducts maintain close metal-metal contacts in the solid state.

Original languageEnglish (US)
Article number114471
JournalPolyhedron
Volume181
DOIs
StatePublished - May 1 2020

Bibliographical note

Funding Information:
PLD acknowledges a UMN Doctoral Dissertation Fellowship for funding. IAT gratefully acknowledges the Alfred P. Sloan Foundation for support. Equipment for the University of Minnesota Chemistry Department NMR facility were supported through a grant from the National Institutes of Health (S10OD011952) with matching funds from the University of Minnesota . We thank Dr. Victor Young Jr. (UMN) and J.T. Moore (UMN) for crystallographic assistance.

Keywords

  • Bimetallic
  • Metal-metal bonding
  • Metalloligand
  • Phosphine ligand
  • Tantalum
  • X-ray crystallography

PubMed: MeSH publication types

  • Journal Article

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