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The hemoglobin in the blood, the chlorophyll in green plants, vitamin B-12, and the catalyst used in the manufacture of polyethylene all contain coordination compounds. Ions of the metals, especially the transition metals, are likely to form complexes.
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Chemical bonding in a linear chromium metal string complex.

Lai-Chin Wu1, Maja K Thomsen, Solveig R Madsen

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This study reveals localized Cr-Cr bonding in a chromium metal wire using electron density analysis. The findings shed light on the electronic structure of short metal chains.

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Area of Science:

  • Inorganic Chemistry
  • Solid-State Chemistry
  • Quantum Chemistry

Background:

  • The electronic structure and bonding in metal-metal bonds are crucial for understanding materials properties.
  • Short metal chains, like trichromium wires, offer a unique platform to study fundamental bonding interactions.

Purpose of the Study:

  • To investigate the electron density distribution and bonding characteristics of a linear trichromium metal wire.
  • To elucidate the nature of the Cr-Cr bonds and the electronic environment of the chromium atoms.

Main Methods:

  • High-resolution X-ray diffraction at 100 K and 15 K.
  • Experimental and theoretical electron density studies.
  • Topological analysis of electron density, delocalization indices, and natural bond orbital analysis.

Main Results:

  • Unequal Cr-Cr bond lengths observed at 100 K, becoming nearly equal at 15 K.
  • Electron density analysis reveals localized Cr-Cr bonding with partial covalent character.
  • The central Cr atom (Cr2) exhibits smaller atomic charge and volume compared to terminal atoms (Cr1 and Cr3).
  • High stabilization energy for Cr-Cr bonds (E(2) ~ 190 kcal mol(-1)) indicates strong interactions.

Conclusions:

  • The study confirms localized Cr-Cr bonding within the trichromium wire.
  • Electron density provides detailed insights into the electronic structure and bonding of short metal chains.
  • The findings contribute to the fundamental understanding of metal-metal interactions in low-dimensional materials.