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Exploring the Tl H potential energy surface: A comparative analysis with group 13 systems and experiment.

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This study characterizes thallium hydride (TlH) potential energy surfaces, revealing the planar dibridged isomer is most stable. Theoretical findings show significant variations compared to other Group 13 hydrides, with experimental incompatibilities noted.

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Area of Science:

  • Computational chemistry
  • Theoretical inorganic chemistry

Background:

  • Thallium chemistry is gaining importance.
  • Characterizing simple thallium compounds is valuable.

Purpose of the Study:

  • To characterize stationary points on the singlet and triplet thallium hydride (TlH) potential energy surface.
  • To determine the relative energies of different TlH isomers.

Main Methods:

  • High-level ab initio calculations, including coupled cluster methods (CCSD(T), CCSDT(Q)).
  • Geometry optimization and frequency calculations using augmented correlation-consistent basis sets (aug-cc-pwCVQZ-PP, aug-cc-pwCVTZ-PP).
  • Extrapolation to the complete basis set limit using the focal point approach and inclusion of zero-point vibrational energy corrections.

Main Results:

  • The planar dibridged TlH isomer was found to be the lowest in energy.
  • The linear TlH structure was identified as the highest in energy.
  • Significant variations were observed when comparing TlH to other Group 13 M H compounds (M = B, Al, Ga, In).

Conclusions:

  • The theoretical study provides detailed energetic and structural information for TlH isomers.
  • Discrepancies between theoretical predictions and experimental data for thallium hydride were identified.