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Pnictogen-based vanadacyclobutadiene complexes.

Mehrafshan G Jafari1, John B Russell1, Hwan Myung2,3

  • 1Department of Chemistry, University of Pennsylvania Philadelphia Pennsylvania 19104 USA mindiola@sas.upenn.edu.

Chemical Science
|November 21, 2024
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Summary
This summary is machine-generated.

This study reveals new vanadium complexes with rare α-aza- and β-phospha-vanadacyclobutadiene structures. These compounds are stabilized by unique vanadium-heteroatom interactions, expanding organometallic chemistry.

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Area of Science:

  • Organometallic Chemistry
  • Inorganic Chemistry
  • Materials Science

Background:

  • The reactivity of low-coordinate vanadium complexes with multiple bonds is crucial for synthesizing novel organometallic compounds.
  • Understanding the electronic structure and bonding in transition metal heterocycles provides insights into their stability and reactivity.
  • Vanadacyclobutadienes are rare and their synthesis and characterization are of significant interest in coordination chemistry.

Purpose of the Study:

  • To investigate the reactivity of a vanadium-carbide complex with unsaturated nitrogen and phosphorus substrates.
  • To synthesize and characterize novel α-aza- and β-phospha-vanadacyclobutadiene complexes.
  • To elucidate the electronic structure and dominant resonance forms of these unique vanadium heterocycles.

Main Methods:

  • Reaction of (dBDI)V[triple bond, length as m-dash]C[triple bond, length as m-dash]Bu(OEt2) with N[triple bond, length as m-dash]CR and P[triple bond, length as m-dash]CAd substrates.
  • Characterization using multinuclear and multidimensional NMR spectroscopy, including 15N-labeling.
  • Solid-state structural analysis (X-ray diffraction) and theoretical electronic structure calculations.

Main Results:

  • Formation of rare α-aza-vanadacyclobutadiene (complexes 1-2) and β-phospha-vanadacyclobutadiene (complex 3) compounds.
  • Detailed structural and spectroscopic data confirming the formation of these novel vanadium heterocycles.
  • Theoretical studies reveal significant V-heteroatom interactions stabilizing the vanadacyclobutadiene rings.

Conclusions:

  • The reactivity of the V[triple bond, length as m-dash]C bond in the vanadium precursor allows for the construction of unique vanadium-heterocycle frameworks.
  • Vanadacyclobutadienes are stabilized by strong electronic interactions between vanadium and the incorporated heteroatoms (N, P).
  • This work expands the known family of low-coordinate vanadium compounds and provides a foundation for further exploration of their chemistry.