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Related Concept Videos

Metallic Solids02:37

Metallic Solids

18.3K
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....
18.3K
Coordination Compounds and Nomenclature02:54

Coordination Compounds and Nomenclature

21.3K
In most main group element compounds, the valence electrons of the isolated atoms combine to form chemical bonds that satisfy the octet rule. For instance, the four valence electrons of carbon overlap with electrons from four hydrogen atoms to form CH4. The one valence electron leaves sodium and adds to the seven valence electrons of chlorine to form the ionic formula unit NaCl (Figure 1a). Transition metals do not normally bond in this fashion. They primarily form coordinate covalent bonds, a...
21.3K
Nitriles to Amines: LiAlH4 Reduction00:55

Nitriles to Amines: LiAlH4 Reduction

3.3K
Nitriles are reduced to amines in the presence of strong reducing agents like lithium aluminum hydride through a typical nucleophilic acyl substitution. The reaction requires two equivalents of the reducing agent. The reducing agent acts as a source of hydride ions.
As shown below, the mechanism involves three steps. Firstly, the hydride ion acting as a nucleophile attacks the nitrile carbon to form an anion. In the second step, a second equivalent of the hydride ion attacks the anion to...
3.3K
Ladder Diagrams: Complexation Equilibria01:07

Ladder Diagrams: Complexation Equilibria

335
Ladder diagrams are useful for evaluating equilibria involving metal-ligand complexes. The vertical scale of the ladder diagram represents the concentration of unreacted or free ligand, pL. The horizontal lines on the scale depict the log of stepwise formation constants for metal-ligand complexes and indicate the dominant species in all the regions.
The formation constant, K1, for the formation of Cd(NH3)2+ complex from cadmium and ammonia is 3.55 × 102. Log K1 (i.e. pNH3) is 2.55, and...
335
Electron Configuration of Multielectron Atoms03:26

Electron Configuration of Multielectron Atoms

39.7K
The alkali metal sodium (atomic number 11) has one more electron than the neon atom. This electron must go into the lowest-energy subshell available, the 3s orbital, giving a 1s22s22p63s1 configuration. The electrons occupying the outermost shell orbital(s) (highest value of n) are called valence electrons, and those occupying the inner shell orbitals are called core electrons. Since the core electron shells correspond to noble gas electron configurations, we can abbreviate electron...
39.7K
Other Nuclides: 31P, 19F, 15N NMR01:16

Other Nuclides: 31P, 19F, 15N NMR

372
Many organic, inorganic, and biological molecules contain spin-half nuclei such as nitrogen-15, fluorine-19, and phosphorus-31. As a result, NMR studies of these nuclei have found extensive applications in chemical and biological research.
While fluorine-19 and phosphorous-31 have high natural abundances (100%) and positive gyromagnetic ratios, nitrogen-15 has a low natural abundance and a negative gyromagnetic ratio. However, nitrogen-15 is still preferred over nitrogen-14 (which has a...
372

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"Mn3AlN" is Really Mn4N.

Shaun O'Donnell1,2, Sharad Mahatara2, Stephan Lany2

  • 1Department of Chemistry, Colorado State University, Fort Collins, Colorado 80523-1877, United States.

Inorganic Chemistry
|August 14, 2024
PubMed
Summary
This summary is machine-generated.

Researchers investigated the synthesis of antiperovskite manganese aluminum nitride (Mn3AlN). Experiments and calculations reveal that the synthesized material is actually Mn4N, not Mn3AlN, with differing magnetic properties.

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Area of Science:

  • Materials Science
  • Solid-State Chemistry
  • Magnetism

Background:

  • The synthesis of antiperovskite manganese aluminum nitride (Mn3AlN) has been previously reported.
  • Understanding the properties of novel nitride materials is crucial for potential applications.

Purpose of the Study:

  • To investigate the synthesis of antiperovskite Mn3AlN.
  • To clarify the identity and magnetic properties of the synthesized manganese aluminum nitride phases.
  • To reconcile discrepancies with previously published findings.

Main Methods:

  • Synthesis attempts using published and novel reaction pathways.
  • Characterization via synchrotron powder X-ray diffraction (SPXRD).
  • X-ray absorption spectroscopy (XAS) and magnetometry.
  • Thermochemical calculations using density functional theory (DFT).

Main Results:

  • Synthesis attempts consistently yielded Mn4N and Mn5Al8, not Mn3AlN.
  • SPXRD, XAS, and magnetometry confirmed the presence of Mn4N.
  • DFT calculations indicated Mn3AlN is metastable and predicted an antiferromagnetic ground state.
  • Observed magnetic behavior aligns with ferrimagnetic Mn4N, contradicting prior reports.

Conclusions:

  • The compound previously reported as Mn3AlN is identified as Mn4N.
  • The magnetic properties of the synthesized material are consistent with Mn4N.
  • Experimental and computational evidence challenges previous claims regarding Mn3AlN synthesis and properties.