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This study reports the isolation of rare diatomic zero-valent complexes of tin and lead. These novel main group complexes were stabilized by specific ligand fragments, expanding the known chemistry of low-valent main group elements.

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Area of Science:

  • Inorganic Chemistry
  • Main Group Chemistry
  • Organometallic Chemistry

Background:

  • Diatomic zero-valent complexes are exceptionally rare in main group chemistry.
  • Previous examples were stabilized exclusively by carbene or silylene ligands.
  • This highlights a gap in understanding the stabilization of low-valent, multi-atom main group species.

Purpose of the Study:

  • To synthesize and characterize novel diatomic zero-valent complexes of tin (Sn) and lead (Pb).
  • To investigate the stabilization of these diatomic species using bulky ligand frameworks.
  • To expand the scope of known zero-valent main group element compounds.

Main Methods:

  • Synthesis involving trilithium salt N{CH₂CH₂NLiPⁱPr₂}₃ with SnCl₂ and subsequent reduction with KC₈.
  • Isolation and characterization of tin-based complexes, including a Sn₃ chain and a Sn₄ chain with a diatomic Sn(0)-Sn(0) unit.
  • Reaction of tin complexes with PbI₂ and KC₈ to form lead-containing complexes with a diatomic Pb(0)-Pb(0) unit.

Main Results:

  • Successful isolation of diatomic Sn(0)-Sn(0) species within a Sn₄ chain complex.
  • Isolation of diatomic Pb(0)-Pb(0) species in a novel heavy main group complex.
  • Computational studies confirmed the presence and electronic structure of the diatomic E(0)-E(0) units.

Conclusions:

  • This work presents the first examples of diatomic zero-valent main group complexes of tin and lead stabilized by [N{CH₂CH₂NPⁱPr₂}₃Sn] fragments.
  • The findings demonstrate a new strategy for stabilizing low-valent, multi-atom main group elements.
  • This research significantly advances the field of main group chemistry and low-valent element stabilization.