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Valence Bond Theory02:42

Valence Bond Theory

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Coordination compounds and complexes exhibit different colors, geometries, and magnetic behavior, depending on the metal atom/ion and ligands from which they are composed. In an attempt to explain the bonding and structure of coordination complexes, Linus Pauling proposed the valence bond theory, or VBT, using the concepts of hybridization and the overlapping of the atomic orbitals. According to VBT, the central metal atom or ion (Lewis acid) hybridizes to provide empty orbitals of suitable...
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Overview of Valence Bond Theory
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Electrons are negatively charged subatomic particles that are attracted to an orbit around the positively-charged nucleus of an atom. They reside in locations that are associated with energy levels called shells and are further organized into sub-shells and orbitals within each shell.
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The mitochondrial electron transport chain (ETC) is the main energy generation system in the eukaryotic cells. However, mitochondria also produce cytotoxic reactive oxygen species (ROS) due to the large electron flow during oxidative phosphorylation. While Complex I is one of the primary sources of superoxide radicals, ROS production by Complex II is uncommon and may only be observed in cancer cells with mutated complexes.
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Crystal Field Theory
To explain the observed behavior of transition metal complexes (such as colors), a model involving electrostatic interactions between the electrons from the ligands and the electrons in the unhybridized d orbitals of the central metal atom has been developed. This electrostatic model is crystal field theory (CFT). It helps to understand, interpret, and predict the colors, magnetic behavior, and some structures of coordination compounds of transition metals.
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The alkali metal sodium (atomic number 11) has one more electron than the neon atom. This electron must go into the lowest-energy subshell available, the 3s orbital, giving a 1s22s22p63s1 configuration. The electrons occupying the outermost shell orbital(s) (highest value of n) are called valence electrons, and those occupying the inner shell orbitals are called core electrons. Since the core electron shells correspond to noble gas electron configurations, we can abbreviate electron...
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Electron localization in a mixed-valence diniobium benzene complex.

Thomas L Gianetti1, Grégory Nocton2, Stefan G Minasian3,4

  • 1Department of Chemistry , University of California , Berkeley , CA 94720 , USA . Email: arnold@berkeley.edu ;

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Oxidation of a diniobium benzene complex yields an asymmetric cationic species with one unpaired electron. This diniobium complex exhibits new reactivity, enabling metal-based chemistry with various substrates.

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Area of Science:

  • Organometallic Chemistry
  • Coordination Chemistry
  • Materials Science

Background:

  • Diniobium complexes offer unique electronic properties.
  • Arene ligands play a crucial role in stabilizing metal centers.
  • Understanding electron transfer in metal-metal bonded systems is key.

Purpose of the Study:

  • To investigate the electronic and structural consequences of single-electron oxidation of a neutral diniobium benzene complex.
  • To characterize the resulting cationic diniobium arene complex.
  • To explore the reactivity of the oxidized species.

Main Methods:

  • Single-crystal X-ray diffraction
  • Cyclic voltammetry
  • Magnetic susceptibility measurements
  • Multinuclear NMR spectroscopy
  • Density functional theory (DFT) calculations
  • UV-visible spectroscopy
  • Nb L3,2-edge X-ray absorption near-edge structure (XANES)
  • Electron paramagnetic resonance (EPR) spectroscopy

Main Results:

  • Single-electron oxidation of {[Nb(BDI)NBu]2(μ-C6H6)} to {[Nb(BDI)NBu]2(μ-C6H6)}{B(C6F5)4} was achieved.
  • The oxidized product is an asymmetric diniobium complex with two inequivalent Nb atoms.
  • One Nb atom carries a single unpaired electron, largely localized and not significantly delocalized onto the second Nb atom.
  • Oxidation destabilizes the molecule by removing an electron from the δ-bonding HOMO, leading to asymmetry.

Conclusions:

  • The study successfully synthesized and characterized an asymmetric cationic diniobium arene complex via single-electron oxidation.
  • The resulting complex exhibits unique electronic and structural features, with a localized unpaired electron.
  • The oxidized diniobium complex demonstrates enhanced reactivity towards substrates previously unreactive with the neutral precursor, opening avenues for new metal-based chemistry.