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Closed-shell molecules that ionize more readily than cesium.

F Albert Cotton1, Nadine E Gruhn, Jiande Gu

  • 1Department of Chemistry and Laboratory for Molecular Structure and Bonding, Texas A&M University, Post Office Box 30012, College Station, TX 77842-3012, USA. cotton@tamu.edu

Science (New York, N.Y.)
|December 10, 2002
PubMed
Summary

Researchers discovered new dimetal complexes with exceptionally low ionization energies, surpassing even cesium. These novel molecules, M2(hpp)4, offer groundbreaking insights into chemical bonding and electron behavior.

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Area of Science:

  • Inorganic Chemistry
  • Physical Chemistry
  • Quantum Chemistry

Background:

  • The ionization energy of a neutral atom or molecule is a fundamental property related to its electronic structure.
  • Cesium holds the record for the lowest ionization energy among all known elements.
  • Discovering species with ionization energies lower than cesium is a significant scientific challenge.

Purpose of the Study:

  • To report a novel class of dimetal complexes with exceptionally low ionization enthalpies.
  • To investigate the electronic structure and bonding characteristics responsible for these low ionization energies.
  • To compare the ionization properties of these complexes with known elements and molecules.

Main Methods:

  • Synthesis and structural characterization of M2(hpp)4 complexes (M = Cr, Mo, W).

Related Experiment Videos

  • Gas-phase spectroscopic characterization to determine ionization energies.
  • Theoretical computations to model electronic structure and bonding.

    • Main Results:

    • A new class of dimetal complexes, M2(hpp)4, exhibiting extremely low ionization enthalpies was synthesized.
    • One complex demonstrated a gas-phase ionization energy of 3.51 eV, lower than cesium and all other reported closed-shell molecules.
    • Ionization involves electron removal from a delta bonding orbital within the quadruple metal-metal bond, strongly influenced by hpp ligands.

    Conclusions:

    • The discovered dimetal complexes represent a new frontier in low-ionization-energy species.
    • The unique electronic configuration, particularly the delta bonding orbital interaction with hpp ligands, dictates the remarkably low ionization energies.
    • These findings open avenues for exploring new materials with tailored electronic properties.