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Related Concept Videos

Crystal Field Theory - Octahedral Complexes02:58

Crystal Field Theory - Octahedral 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.
CFT focuses on...
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Resonance and Hybrid Structures02:16

Resonance and Hybrid Structures

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According to the theory of resonance, if two or more Lewis structures with the same arrangement of atoms can be written for a molecule, ion, or radical, the actual distribution of electrons is an average of that shown by the various Lewis structures.
Resonance Structures and Resonance Hybrids
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Crystal Field Theory - Tetrahedral and Square Planar Complexes02:46

Crystal Field Theory - Tetrahedral and Square Planar Complexes

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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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Ionic Crystal Structures02:42

Ionic Crystal Structures

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Ionic crystals consist of two or more different kinds of ions that usually have different sizes. The packing of these ions into a crystal structure is more complex than the packing of metal atoms that are the same size.
Most monatomic ions behave as charged spheres, and their attraction for ions of opposite charge is the same in every direction. Consequently, stable structures for ionic compounds result (1) when ions of one charge are surrounded by as many ions as possible of the opposite...
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Metallic Solids

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Metallic solids such as crystals of copper, aluminum, and iron are formed by metal atoms. The structure of metallic crystals is often described as a uniform distribution of atomic nuclei within a “sea” of delocalized electrons. The atoms within such a metallic solid are held together by a unique force known as metallic bonding that gives rise to many useful and varied bulk properties.
All metallic solids exhibit high thermal and electrical conductivity, metallic luster, and malleability....
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Resonance02:52

Resonance

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The Lewis structure of a nitrite anion (NO2−) may actually be drawn in two different ways, distinguished by the locations of the N-O and N=O bonds.
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Mie-Resonant Three-Dimensional Metacrystals.

Seokhyoung Kim, Cindy Y Zheng, George C Schatz

  • 1Department of Physics, Chungbuk National University, Cheongju 28644, Republic of Korea.

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|October 15, 2020
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Researchers developed 3D optical metamaterials using DNA-engineered gold nanocubes. These structures exhibit high refractive indices and unique light interactions, paving the way for advanced optical devices.

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Area of Science:

  • Materials Science
  • Optics
  • Nanotechnology

Background:

  • Optical metamaterials offer unique electromagnetic properties beyond natural materials.
  • Two-dimensional metasurfaces face limitations in angular and polarization sensitivity.
  • Fabrication of three-dimensional (3D) metamaterials remains a significant challenge.

Purpose of the Study:

  • To develop a method for fabricating isotropic 3D optical metacrystals.
  • To characterize the optical properties of these 3D metacrystals.
  • To explore potential applications in optical computing and cloaking.

Main Methods:

  • Utilized colloidal crystal engineering with DNA to assemble gold (Au) nanocubes.
  • Prepared isotropic 3D metacrystals.
  • Measured optical properties using synchrotron infrared microspectroscopy.

Main Results:

  • Achieved high refractive indices (up to ~8) in the mid-infrared spectrum.
  • Observed multipolar Mie resonances in submicrometer metacrystals.
  • Predicted negative refraction in arrays of metacrystals.

Conclusions:

  • DNA-engineered colloidal crystals provide a viable route to 3D optical metamaterials.
  • These 3D metacrystals demonstrate superior optical properties compared to conventional dielectrics.
  • The findings offer a promising platform for novel optical devices with engineered electromagnetic responses.