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Related Concept Videos

Metallic Solids02:37

Metallic Solids

21.1K
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....
21.1K
¹H NMR: Interpreting Distorted and Overlapping Signals01:02

¹H NMR: Interpreting Distorted and Overlapping Signals

1.6K
Spin systems where the difference in chemical shifts of the coupled nuclei is greater than ten times J are called first-order spin systems. These nuclei are weakly coupled, and their chemical shifts and coupling constant can generally be estimated from the well-separated signals in the spectrum.
As Δν decreases and the signals move closer, the doublets appear increasingly distorted. The intensities of the inner lines increase at the cost of those of the outer lines as the signals are...
1.6K
¹H NMR: Long-Range Coupling01:27

¹H NMR: Long-Range Coupling

2.8K
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.
In alkenes, spin information is communicated via σ–π overlap, as seen in allylic (four-bond) and homoallylic (five-bond) couplings. These coupling interactions are stronger when the σ bond is parallel to the alkene...
2.8K
NMR Spectroscopy and Mass Spectrometry of Aldehydes and Ketones01:15

NMR Spectroscopy and Mass Spectrometry of Aldehydes and Ketones

5.7K
In aldehydes, the hydrogen atom connected to the carbonyl carbon helps distinguish aldehydes from other carbonyl compounds using ¹H NMR spectroscopy. The closeness of aldehydic hydrogen to the electrophilic carbonyl carbon highly deshields the hydrogen atom causing its signal to appear around 10 ppm in the ¹H NMR spectra. α hydrogens split the aldehydic proton signal, which helps identify the number of α hydrogens in the molecule. For instance, one α hydrogen creates a...
5.7K
Molecular and Ionic Solids02:54

Molecular and Ionic Solids

20.5K
Crystalline solids are divided into four types: molecular, ionic, metallic, and covalent network based on the type of constituent units and their interparticle interactions.
Molecular Solids
Molecular crystalline solids, such as ice, sucrose (table sugar), and iodine, are solids that are composed of neutral molecules as their constituent units. These molecules are held together by weak intermolecular forces such as London dispersion forces, dipole-dipole interactions, or hydrogen bonds, which...
20.5K
¹H NMR: Complex Splitting01:13

¹H NMR: Complex Splitting

2.0K
A proton M that is coupled to a proton X results in doublet signals for M. However, NMR-active nuclei can be simultaneously coupled to more than one nonequivalent nucleus. When M is coupled to a second proton A, such as in styrene oxide, each peak in the doublet is split into another doublet.
Splitting diagrams or splitting tree diagrams are routinely used to depict such complex couplings. While drawing splitting diagrams, the splitting with the larger coupling constant is usually applied...
2.0K

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Methods of Ex Situ and In Situ Investigations of Structural Transformations: The Case of Crystallization of Metallic Glasses
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Methods of Ex Situ and In Situ Investigations of Structural Transformations: The Case of Crystallization of Metallic Glasses

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Structural Characterization of Intermetallic Compounds by 27Al Solid State NMR Spectroscopy.

Christopher Benndorf1,2,3, Hellmut Eckert2,4, Oliver Janka1,5

  • 1Institut für Anorganische und Analytische Chemie, Westfälische Wilhelms-Universität Münster , Corrensstraße 28/30, 48149 Münster, Germany.

Accounts of Chemical Research
|June 8, 2017
PubMed
Summary

High-resolution 27Al NMR spectroscopy is a powerful tool for characterizing intermetallic aluminum compounds. This method provides detailed structural insights, including validation, disorder analysis, and electronic structure determination.

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Atomic Scale Structural Studies of Macromolecular Assemblies by Solid-state Nuclear Magnetic Resonance Spectroscopy
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High-Sensitivity Nuclear Magnetic Resonance at Giga-Pascal Pressures: A New Tool for Probing Electronic and Chemical Properties of Condensed Matter under Extreme Conditions
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Area of Science:

  • Solid State Chemistry
  • Materials Science
  • Condensed Matter Physics
  • Spectroscopy

Background:

  • Intermetallic compounds possess intriguing crystal chemistry and physical properties, driving interest across multiple scientific disciplines.
  • Structural information, especially from X-ray diffraction, is crucial for understanding intermetallic compounds.
  • Complementary methods are valuable for analyzing complex structures, including those with site occupancies or unknown types.

Purpose of the Study:

  • To summarize the state-of-the-art of high-resolution 27Al NMR spectroscopy in intermetallic compounds.
  • To showcase recent research efforts in applying 27Al NMR for structural characterization.
  • To interpret NMR parameters in relation to the structural details of investigated compounds.

Main Methods:

  • Utilized high-resolution 27Al NMR spectroscopy under magic-angle spinning conditions.
  • Applied NMR for crystal structure validation, analysis of structural disorder, and mixed site occupancies.
  • Investigated electronic structure through 27Al magnetic shielding and nuclear electric quadrupolar interactions.

Main Results:

  • Demonstrated the utility of 27Al NMR for validating structures of ternary equiatomic compounds (e.g., CaAuAl, BaAuAl).
  • Probed structural disorder and mixed site occupancies in various intermetallic series (e.g., ScTAl, Na2Au3Al, Heusler compounds).
  • Correlated 27Al magnetic shielding with electronic structure in RET5Al2, RE10TAl3, and Heusler compound series.

Conclusions:

  • High-resolution 27Al NMR is an effective, element-selective tool for detailed structural characterization of intermetallic compounds.
  • NMR parameters provide valuable insights into crystal structure validation, disorder, and electronic properties.
  • This spectroscopic approach complements traditional methods, particularly for complex or novel intermetallic systems.