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Bond energy is the energy required to break a bond homolytically. These values are usually expressed in units of kcal/mol or kJ/mol and are referred to as bond dissociation energies when given for specific bonds or average bond energies when indicated for a given type of bond over many compounds. Firstly, the bond dissociation energy for a single bond is weaker than that of a double bond, which in turn is weaker than that of a triple bond. Secondly, hydrogen forms relatively strong bonds with...
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High Resolution Physical Characterization of Single Metallic Nanoparticles
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Local energy gap opening induced by hemin dimerization in aqueous solution.

Ronny Golnak1, Jie Xiao, Kaan Atak

  • 1Joint Ultrafast Dynamics Lab in Solutions and at Interfaces (JULiq), Institute of Methods for Material Development, Helmholtz-Zentrum Berlin für Materialien und Energie , Albert-Einstein-Strasse 15, D-12489 Berlin, Germany.

The Journal of Physical Chemistry. B
|January 17, 2015
PubMed
Summary

Hemin dimerization in water creates an energy gap at the iron (Fe) center. This gap arises from Fe 3d orbital localization, altering electronic structure compared to the monomer.

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Area of Science:

  • Biochemistry
  • Physical Chemistry
  • Spectroscopy

Background:

  • Hemin, an iron-containing porphyrin, plays crucial roles in biological systems.
  • Hemin can form dimers in aqueous solutions, influencing its properties.
  • Understanding the electronic structure of hemin is key to elucidating its function.

Purpose of the Study:

  • To investigate the local electronic structure of the hemin Fe center during dimerization in aqueous solution.
  • To compare the electronic properties of hemin dimers with hemin monomers.
  • To understand the impact of dimerization on the Fe electronic states.

Main Methods:

  • X-ray absorption spectroscopy (XAS) was employed to probe electronic transitions.
  • X-ray emission spectroscopy (XES) provided insights into valence electronic structure.
  • Spectra of hemin dimers in water were compared to hemin monomers in DMSO.

Main Results:

  • A local energy gap opening was observed at the Fe sites in hemin dimers.
  • Occupied valence states in hemin dimers shifted to lower binding energies.
  • Unoccupied valence states remained similar to those of the hemin monomer.

Conclusions:

  • Hemin dimerization in aqueous solution induces a local energy gap at the Fe center.
  • The observed gap opening is attributed to Fe 3d orbital localization.
  • Dimerization significantly alters the electronic structure of the hemin Fe center.