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Related Concept Videos

Electron Configuration of Multielectron Atoms03:26

Electron Configuration of Multielectron Atoms

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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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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Electron configurations and orbital diagrams can be determined by applying the Aufbau principle (each added electron occupies the subshell of lowest energy available), Pauli exclusion principle (no two electrons can have the same set of four quantum numbers), and Hund’s rule of maximum multiplicity (whenever possible, electrons retain unpaired spins in degenerate orbitals).
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The periodic table arranges atoms based on increasing atomic number so that elements with the same chemical properties recur periodically. When their electron configurations are added to the table, a periodic recurrence of similar electron configurations in the outer shells of these elements is observed. Because they are in the outer shells of an atom, valence electrons play the most important role in chemical reactions. The outer electrons have the highest energy of the electrons in an atom...
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Visualizing Uniaxial-strain Manipulation of Antiferromagnetic Domains in Fe1+YTe Using a Spin-polarized Scanning Tunneling Microscope
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A five-coordinate [2Fe-2S] cluster.

Michael G G Fuchs1, Sebastian Dechert, Serhiy Demeshko

  • 1Institut für Anorganische Chemie, Georg-August-Universität, Tammannstrasse 4, 37077 Göttingen, Germany.

Inorganic Chemistry
|June 4, 2010
PubMed
Summary
This summary is machine-generated.

Researchers synthesized a novel [2Fe-2S] cluster with five-coordinate ferric ions. This unique iron-sulfur cluster features a tridentate capping ligand and distinct spectroscopic properties, differing from conventional clusters.

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Area of Science:

  • Bioinorganic Chemistry
  • Coordination Chemistry
  • Spectroscopy

Background:

  • Iron-sulfur clusters are crucial in biological systems.
  • Understanding their structure-property relationships is vital.
  • Novel synthetic clusters offer insights into fundamental chemistry.

Purpose of the Study:

  • To synthesize and characterize a unique [2Fe-2S] cluster.
  • To investigate the coordination mode of a novel capping ligand.
  • To explore the distinct spectroscopic and electronic properties of the new cluster.

Main Methods:

  • Single-crystal X-ray diffraction for structural analysis.
  • Nuclear Magnetic Resonance (NMR) spectroscopy for electronic structure.
  • Density Functional Theory (DFT) calculations for spin density.
  • Mössbauer, UV/vis spectroscopy, mass spectrometry, cyclic voltammetry, and magnetic susceptibility measurements for comprehensive characterization.

Main Results:

  • A unique [2Fe-2S] cluster with five-coordinate ferric ions was successfully synthesized.
  • The crystal structure and NMR data confirmed 2,6-bis(imidazol-2-yl)pyridine as a tridentate capping ligand.
  • DFT calculations supported the coordination mode by showing spin density on coordinating atoms.
  • The cluster exhibited distinct spectroscopic properties, including a small quadrupole splitting (0.43 mm/s), differentiating it from conventional [2Fe-2S] clusters.

Conclusions:

  • The study presents a novel [2Fe-2S] cluster with unique structural and electronic features.
  • The findings highlight the versatility of imidazole-based ligands in coordinating iron-sulfur cores.
  • The distinct spectroscopic signature provides a benchmark for future studies of related bioinorganic systems.