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Related Experiment Videos

Group 5 imido complexes derived from diamido-pyridine ligands.

S M Pugh1, A J Blake, L H Gade

  • 1Inorganic Chemistry Laboratory, University of Oxford, South Parks Road, Oxford OX1 3QR, U.K.

Inorganic Chemistry
|July 24, 2001
PubMed
Summary

New vanadium, niobium, and tantalum complexes were synthesized using pyridine-based ligands. These metal complexes exhibit fluxional behavior in solution, with dynamic exchange processes observed in six-coordinate species.

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Inorganic chemistry·2003

Area of Science:

  • Organometallic Chemistry
  • Coordination Chemistry
  • Inorganic Synthesis

Background:

  • Vanadium(V) imide complexes and their reactions with nitrogen-donor ligands are of interest.
  • Heavier Group 5 metals (Nb, Ta) offer diverse coordination chemistry with imido and pyridine ligands.
  • Understanding ligand exchange and dynamic processes in metal complexes is crucial for reactivity studies.

Purpose of the Study:

  • To synthesize and characterize novel vanadium(IV) and Group 5 metal(V) complexes.
  • To investigate the reactivity of vanadium(V) imide with a pyridine-based diamine ligand.
  • To explore the coordination chemistry of niobium and tantalum imides with a dilithiated pyridine ligand and study their dynamic behavior.

Main Methods:

  • Reaction of [V(NAr)Cl(3)(THF)] with H(2)N'(2)N(py) to form a vanadium(IV) complex.

Related Experiment Videos

  • Reaction of [M(NR)Cl(3)(py)(2)] (M=Nb, Ta) with Li(2)[N(2)N(py)] to yield six-coordinate M(V) complexes.
  • Characterization using X-ray crystallography, solution NMR spectroscopy to study fluxionality, and activation parameter determination.

    • Main Results:

    • A vanadium(IV) species [V(NAr)(H(3)N'N' 'N(py))Cl(2)] (1) was obtained from the reaction with the diamino-pyridine derivative.
    • Six-coordinate M(V) complexes [M(NR)Cl(N(2)N(py))(py)] (2-4) were synthesized for M=Nb, Ta.
    • Compounds 2-4 exhibited fluxional behavior in solution, attributed to dynamic exchange via five-coordinate intermediates. Activation parameters were determined for complexes 2 and 3. Compound 5, [Nb(N(t)()Bu)Cl(N(2)N(py))], was obtained by sublimation of complex 2. X-ray crystal structures of 1, 2, 3, and 4 were determined.

    Conclusions:

    • The study successfully synthesized and structurally characterized novel vanadium and Group 5 metal complexes.
    • The reactivity of vanadium imides and the coordination versatility of niobium and tantalum imides were demonstrated.
    • Dynamic processes in solution were observed and quantified for the Group 5 metal complexes, providing insights into their fluxional nature.