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Crystal Field Theory - Octahedral Complexes02:58

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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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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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Tetrahedral Complexes
Crystal field theory (CFT) is applicable to molecules in geometries other than octahedral. In octahedral complexes, the lobes of the dx2−y2 and dz2 orbitals point directly at the ligands. For tetrahedral complexes, the d orbitals remain in place, but with only four ligands located between the axes. None of the orbitals points directly at the tetrahedral ligands. However, the dx2−y2 and dz2 orbitals (along the Cartesian axes) overlap with the ligands less than the dxy,...
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An ionic compound is stable because of the electrostatic attraction between its positive and negative ions. The lattice energy of a compound is a measure of the strength of this attraction. The lattice energy (ΔHlattice) of an ionic compound is defined as the energy required to separate one mole of the solid into its component gaseous ions. For the ionic solid sodium chloride, the lattice energy is the enthalpy change of the process:
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In an atom, the negatively charged electrons are attracted to the positively charged nucleus. In a multielectron atom, electron-electron repulsions are also observed. The attractive and repulsive forces are dependent on the distance between the particles, as well as the sign and magnitude of the charges on the individual particles. When the charges on the particles are opposite, they attract each other. If both particles have the same charge, they repel each other.
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An applied magnetic field causes the electrons present in the molecule to circulate, setting up a local diamagnetic current within the molecule. The local diamagnetic current arising from circulating sigma-bonding electrons induces a magnetic field, Blocal that opposes the applied magnetic field, B0. The effective magnetic field experienced by these nuclei is given by the difference between the applied and local magnetic fields in a phenomenon called local diamagnetic shielding. Essentially,...
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Inverting Asymmetric Confinement Potentials in Core/Thick-Shell Nanocrystals.

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    We studied CdSe/ZnSe giant-nanocrystal quantum dots (g-NQDs) and found their quantum yield for biexcitons is comparable to CdSe/CdS g-NQDs. Hole charging in CdSe/ZnSe g-NQDs causes intensity fluctuations.

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    Area of Science:

    • Materials Science
    • Quantum Dots
    • Nanotechnology

    Background:

    • Investigating CdSe/ZnSe core/thick-shell nanocrystals (giant-nanocrystal quantum dots, g-NQDs) with asymmetric electron/hole confinement.
    • Comparing their photoluminescence (PL) properties to CdSe/CdS g-NQDs.

    Discussion:

    • Analyzing photon streams across five PL intensity levels using second-order photon correlation (g((2))) traces.
    • Decoupling exciton charging effects from g((2)) experiments.
    • Evaluating Auger recombination rates for positive and negative trion states.

    Key Insights:

    • Determined quantum yield of neutral biexciton states in CdSe/ZnSe g-NQDs is ~20-50%, similar to CdSe/CdS g-NQDs.
    • Observed suppressed Auger recombination for positive trions compared to negative trions.
    • Identified heavy hole effective mass and more facile hole charging as causes for PL fluctuations in CdSe/ZnSe g-NQDs.

    Outlook:

    • Understanding charge carrier dynamics in core/shell quantum dots.
    • Potential for tuning optical properties of g-NQDs by controlling shell composition and asymmetry.
    • Implications for applications requiring stable light emission from quantum dots.