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Nuclear Overhauser Enhancement (NOE)01:07

Nuclear Overhauser Enhancement (NOE)

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Irradiation of a spin-active nucleus causes an increase or decrease in the signal intensity of neighboring nuclei that are not necessarily chemically bonded or involved in J-coupling.  This phenomenon, called the Nuclear Overhauser Enhancement (NOE), results from through-space interactions between the nuclear spins. The NOE effect decreases with increasing internuclear distance and is generally not observed beyond 4 angstroms. In NOE, dipole-dipole interactions between neighboring...
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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.
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The structure of a crystalline solid, whether a metal or not, is best described by considering its simplest repeating unit, which is referred to as its unit cell. The unit cell consists of lattice points that represent the locations of atoms or ions. The entire structure then consists of this unit cell repeating in three dimensions. The three different types of unit cells present in the cubic lattice are illustrated in Figure 1.
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Surface-like NOx Reduction at an Atomically-Precise Tricopper Cluster.

Andrew W Beamer1, Joshua A Buss1

  • 1Willard Henry Dow Laboratory, Department of Chemistry, University of Michigan, 930 N. University Avenue, Ann Arbor, MI, 48109, USA.

Angewandte Chemie (International Ed. in English)
|February 7, 2025
PubMed
Summary
This summary is machine-generated.

Researchers developed a novel copper catalyst cluster for nitrogen oxide (NOx) remediation. This cluster efficiently converts NOx pollutants into nitrogen gas (N2), offering a promising solution for environmental cleanup.

Keywords:
NOxRRcatalysiscoppernitrate reductionoxygen atom transfer (OAT)

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Area of Science:

  • Catalysis
  • Environmental Chemistry
  • Materials Science

Background:

  • Combustion and fertilizers increase environmental nitrogen oxides (NOx).
  • Copper catalysts are promising for NOx remediation, but reaction mechanisms remain unclear.
  • Understanding elementary steps is crucial for designing efficient catalysts.

Purpose of the Study:

  • To prepare and characterize a novel copper cluster for NOx reduction.
  • To elucidate the catalytic mechanism of nitrogen oxide conversion to nitrogen gas.
  • To map the complete denitrification cycle at a molecular level.

Main Methods:

  • Synthesis of a molecular tricuprous μ3-oxo complex.
  • Preparation of a reduced, surface-like copper cluster.
  • Characterization using spectroscopy and electronic structure calculations.
  • Catalytic studies for NOx reductive coupling and reduction of nitrate/nitrite.

Main Results:

  • A highly reactive, surface-like copper cluster (2) with σ-aromaticity was synthesized.
  • Cluster 2 effectively catalyzes the reductive coupling of NO to N2, via N2O.
  • Sequential oxygen atom transfer steps were identified as the key mechanism.
  • Complete denitrification cycle was mapped, including stoichiometric reduction of NO3- and NO2-.

Conclusions:

  • The novel copper cluster provides insights into NOx remediation mechanisms.
  • σ-aromaticity in the copper core facilitates two-electron chemistry for denitrification.
  • This atomically-precise cluster enables a comprehensive understanding of the catalytic cycle.