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Electronic Structure of Atoms02:28

Electronic Structure of Atoms


An atom comprises protons and neutrons, which are contained inside the dense, central core called the nucleus, with electrons present around the nucleus. Taking into account the wave–particle duality of electrons and the uncertainty in position around the nucleus, quantum mechanics provides a more accurate model for the atomic structure. It describes atomic orbitals as the regions around the nucleus where electrons of discrete energy exist, characterized by four quantum numbers:  n, l, ml, and...
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Valence Bond Theory

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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Color in Coordination Complexes
When atoms or molecules absorb light at the proper frequency, their electrons are excited to higher-energy orbitals. For many main group atoms and molecules, the absorbed photons are in the ultraviolet range of the electromagnetic spectrum, which cannot be detected by the human eye. For coordination compounds, the energy difference between the d orbitals often allows photons in the visible range to be absorbed and emitted, which is seen as colors by the human eye.
Spin–Spin Coupling: One-Bond Coupling01:17

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Coupling interactions are strongest between NMR-active nuclei bonded to each other, where spin information can be transmitted directly through the pair of bonding electrons. While nuclei polarize their electrons to the opposite spins, the bonding electron pair has opposite spins. Configurations with antiparallel nuclear spins are expected to be lower in energy. When coupling makes antiparallel states more favorable, J is considered to have a positive value. The one-bond coupling constant, 1J,...

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Triple-stranded metallo-helicates addressable as Lloyd's electron spin qubits.

Yasushi Morita1, Yumi Yakiyama, Shigeaki Nakazawa

  • 1Department of Chemistry, Graduate School of Science, Osaka University, Toyonaka, Osaka 560-0043, Japan. morita@chem.sci.osaka-u.ac.jp

Journal of the American Chemical Society
|May 4, 2010
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Researchers synthesized stable triple-stranded metallo-helicates using quaterimidazole and metal ions, creating a foundation for synthetic electron spin qubits. This breakthrough offers a practical path toward scalable quantum computers and quantum information processing systems.

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Area of Science:

  • Supramolecular Chemistry
  • Quantum Computing
  • Materials Science

Background:

  • Metallo-helicates are crucial for developing quantum information processing systems.
  • Existing metallo-helicates often lack stability in solution.
  • Synthetic electron spin qubits require robust molecular scaffolds.

Purpose of the Study:

  • To synthesize novel triple-stranded metallo-helicates with enhanced stability.
  • To explore the potential of these helicates as synthetic electron spin qubits.
  • To investigate their application in scalable quantum computing architectures.

Main Methods:

  • Synthesis of triple-stranded metallo-helicates using 4,4':2',2'':4'',4'''-quaterimidazole (Qim) and Mn(II)/Zn(II) ions.
  • Crystal structure analysis to elucidate hydrogen-bonding networks.
  • Preparation of magnetically diluted single crystals by varying Mn(II)/Zn(II) ratios.
  • Characterization of g-tensors for g-engineering applications.

Main Results:

  • Achieved first synthesis of stable triple-stranded Qim-based metallo-helicates.
  • Demonstrated high stability in solution at room temperature.
  • Successfully created magnetically diluted crystals for prototype electron-spin qubits.
  • Confirmed the utility of Qim helicates in Lloyd's one-dimensional periodic system with g-engineering.

Conclusions:

  • Qim-based triple helicates offer a stable and versatile platform for synthetic electron spin qubits.
  • These findings provide a practical approach to scalable quantum computers and quantum information processing.
  • The study links supramolecular chemistry directly to advancements in quantum computing.