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Related Concept Videos

Spin–Spin Coupling: Two-Bond Coupling (Geminal Coupling)01:20

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Two NMR-active nuclei bonded to a central atom can be involved in geminal or two-bond coupling. Geminal coupling is commonly seen between diastereotopic protons in chiral molecules and unsymmetrical alkenes, among others.
The central atom need not be NMR-active because its electrons are affected by the electron polarization of the spin-active atoms. However, spin information is transmitted less effectively than in one-bond coupling, and 2J values are usually weaker than 1J values. The energy of...
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Vicinal or three-bond coupling is commonly observed between protons attached to adjacent carbons. Here, nuclear spin information is primarily transferred via electron spin interactions between adjacent C‑H bond orbitals. This generally favors the antiparallel arrangement of spins, so 3J values are usually positive.
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¹H NMR: Long-Range Coupling01:27

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The coupling interactions of nuclei across four or more bonds are usually weak, with J values less than 1 Hz. While these are usually not observed in spectra, the presence of multiple bonds along the coupling pathway can result in observable long-range coupling.
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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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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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Synthesis, Characterization, and Functionalization of Hybrid Au/CdS and Au/ZnS Core/Shell Nanoparticles
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Coupling modes of gold trimer superstructures.

Alison M Funston1, Timothy J Davis, Carolina Novo

  • 1School of Chemistry and Bio21 Institute, University of Melbourne, Parkville, Victoria, VIC 3010, Australia. alison.funston@monash.edu

Philosophical Transactions. Series A, Mathematical, Physical, and Engineering Sciences
|August 3, 2011
PubMed
Summary
This summary is machine-generated.

Researchers studied coupling modes in gold nanorod trimers. An electrostatic eigenmode method accurately reproduced experimental spectra, revealing the nature of these plasmonic interactions.

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Area of Science:

  • Plasmonics
  • Nanophotonics
  • Optical metamaterials

Background:

  • Gold nanostructures exhibit unique optical properties due to surface plasmon resonances.
  • Understanding coupling modes in complex nanostructures is crucial for advanced optical applications.

Purpose of the Study:

  • To experimentally and theoretically investigate the coupling modes in gold nanorod trimers.
  • To elucidate the nature of plasmonic interactions within these superstructures.

Main Methods:

  • Experimental measurement of the optical spectrum of gold nanorod trimers.
  • Theoretical modeling using an electrostatic eigenmode method.
  • Analysis of evanescent electric field coupling.

Main Results:

  • The experimental spectrum of gold nanorod trimers was successfully obtained.
  • The electrostatic eigenmode method accurately reproduced the experimental spectrum.
  • The nature of the coupling modes and their interactions were identified.

Conclusions:

  • The electrostatic eigenmode method provides a reliable approach to understanding plasmonic coupling in nanorod trimers.
  • This study enhances the comprehension of light-matter interactions in complex plasmonic systems.