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Electronically Excited Complex Formation in Magnesium Cluster-Halogen Atom Reactions.

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The reaction of magnesium clusters with fluorine atoms produced a near-ultraviolet transition in magnesium difluoride (Mg2F). Researchers determined vibrational frequencies for Mg2F and compared its electronic structure to magnesium dichloride (Mg2Cl).

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Area of Science:

  • Physical Chemistry
  • Computational Chemistry
  • Spectroscopy

Background:

  • Understanding the reaction dynamics and electronic structure of metal halide clusters is crucial for materials science and chemical synthesis.
  • Previous studies have investigated magnesium fluoride (MgF) and related compounds, but the spectroscopy and structure of Mg2F remained less understood.

Purpose of the Study:

  • To observe and analyze the near-ultraviolet emission spectrum of magnesium difluoride (Mg2F) produced from the reaction of magnesium clusters with fluorine atoms.
  • To determine the ground-state vibrational frequencies and excited-state symmetric stretch frequency of Mg2F.
  • To elucidate the electronic structure and bonding characteristics of Mg2F using high-level computational methods and compare it with Mg2Cl.

Main Methods:

  • Chemiluminescence spectroscopy was employed to observe the emission from the Mg-F reaction.
  • Dispersed laser-induced fluorescence (DLIF) was used to further probe the excited states and determine vibrational frequencies.
  • Coupled-cluster calculations with a complete basis set (CCSD(T)/CBS) were performed to predict the electronic structure and geometries of Mg2F and Mg2Cl isomers.

Main Results:

  • A near-ultraviolet transition of Mg2F was observed and assigned, with two ground-state vibrational frequencies (ν1 = 516 ± 10 cm⁻¹, ν2 = 104 ± 10 cm⁻¹) determined.
  • The excited-state symmetric stretch frequency was estimated to be approximately 370 ± 30 cm⁻¹.
  • Electronic structure calculations revealed that the ground state of Mg2F possesses C2 symmetry and can be described as an Mg2+F- ion pair, with a transition largely occurring between magnesium dimer ion orbitals. The Mg2Cl ground state was found to be a linear C∞v MgMgCl structure.

Conclusions:

  • The study successfully characterized the electronic transition and vibrational structure of Mg2F, providing insights into its bonding and symmetry.
  • The findings highlight the importance of electronic structure calculations in interpreting experimental spectroscopic data for metal-containing molecules.
  • Comparison with Mg2Cl isomers further clarifies the structural preferences and electronic configurations in related magnesium halide systems.