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The Periodic Table and Kinetics?

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The reactivity of chemical elements varies dramatically across the periodic table, with water residence times (τH2O) for ions spanning over 20 orders of magnitude. This study reveals trends in ion kinetics, impacting our understanding of chemical reactivity.

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Area of Science:

  • Inorganic Chemistry
  • Physical Chemistry
  • Chemical Kinetics

Background:

  • Mendeleev's periodic table initially focused on properties like atomic volume and valence.
  • Systematic studies of elemental reactivity, particularly kinetics, emerged later.
  • Understanding ion hydration and water exchange is crucial for chemical processes.

Purpose of the Study:

  • To illustrate the systematic variation of chemical kinetics across the periodic table.
  • To compare water residence times (τH2O) for monoatomic ions in aqueous solutions.
  • To correlate electronic configuration and coordination with water exchange rates.

Main Methods:

  • Comparison of water residence times (τH2O) for various monoatomic ions.
  • Analysis of kinetic data across the periodic table, including main group, transition metals, and lanthanides.
  • Investigating the influence of electronic configuration and ion coordination on water exchange dynamics.

Main Results:

  • A vast variation in τH2O, spanning over 20 orders of magnitude (~10 ps to ~200 years), was observed.
  • Most main group elements exhibit short residence times (<10 ns), except for some small +2 and +3 cations.
  • D-block transition metal and lanthanide ions show residence times dependent on electronic configuration, with lanthanides having surprisingly short values (≤10 ns).

Conclusions:

  • Elemental reactivity, specifically ion hydration kinetics, exhibits significant periodicity.
  • Lanthanide ions' short water residence times are attributed to an equilibrium between 8 and 9 coordinated species, facilitating water exchange.
  • The findings provide insights into the systematic variation of reactivity and hydration dynamics across the periodic table.