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Colors and Magnetism03:02

Colors and Magnetism

Color in Coordination Complexes
When atoms or molecules absorb light at the proper frequency, their electrons are excited to higher-energy orbitals. For many main group atoms and molecules, the absorbed photons are in the ultraviolet range of the electromagnetic spectrum, which cannot be detected by the human eye. For coordination compounds, the energy difference between the d orbitals often allows photons in the visible range to be absorbed and emitted, which is seen as colors by the human eye.
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An applied magnetic field causes loosely bound π-electrons in organic molecules to circulate, producing a local or induced diamagnetic field over a large spatial volume. As the molecules tumble in solution, the field generated by π-electrons in spherical substituents results in a zero net field. However, the net field generated by π-electrons in non-spherical substituents is not zero. The effect of this induced field depends on the orientation of the molecule with respect to B0, resulting in...
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Transition metals are defined as those elements that have partially filled d orbitals. As shown in Figure 1, the d-block elements in groups 3–12 are transition elements. The f-block elements, also called inner transition metals (the lanthanides and actinides), also meet this criterion because the d orbital is partially occupied before the f orbitals.
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All meta-directing substituents are deactivating groups. These substituents withdraw electrons from the aromatic ring, making the ring less reactive toward electrophilic substitution. For example, the nitration of nitrobenzene is 100,000 times slower than that of benzene because of the deactivating effect of the nitro group. The first step in an electrophilic aromatic substitution is the addition of an electrophile to form a resonance-stabilized carbocation. The energy diagrams for the...

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Structure Sensitivity in CH4 Oxidation: Switching C1 to C2 Selectivity on Mn Single Atoms Versus Nanoparticles.

Wenjun Yu1,2, Lulu Chen3,4, Geqian Fang5

  • 1CAS Key Laboratory of Science and Technology on Applied Catalysis, Dalian Institute of Chemical Physics, Chinese Academy of Sciences, Dalian 116023, China.

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Highly dispersed MnOx/ZSM-5 catalysts, as single atoms or nanoparticles, selectively oxidize methane to valuable oxygenates. Nanoparticles achieve high acetic acid selectivity, offering a noble-metal-free route for methane valorization.

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Area of Science:

  • Catalysis
  • Materials Science
  • Chemical Engineering

Background:

  • Direct selective oxidation of methane (DSOM) to high-value oxygenates under mild conditions is a significant catalytic challenge.
  • Existing methods often lack selectivity or require harsh conditions, limiting practical applications.
  • Developing efficient, noble-metal-free catalysts for methane valorization is crucial for sustainable chemistry.

Purpose of the Study:

  • To investigate the use of highly dispersed MnOx/ZSM-5 catalysts for the direct selective oxidation of methane (DSOM).
  • To understand the structure-dependent mechanisms of methane activation and oxygenate formation.
  • To achieve selective production of C1 and C2 oxygenates, particularly acetic acid, using a noble-metal-free system.

Main Methods:

  • Synthesis and characterization of MnOx/ZSM-5 catalysts with single-atom (SACs) and nanoparticle (NP) configurations.
  • Evaluation of catalytic performance in the direct selective oxidation of methane (DSOM) using CH4 and O2.
  • Utilized density functional theory (DFT) calculations and various characterization techniques to elucidate reaction mechanisms.

Main Results:

  • Mn single-atom catalysts (SACs) primarily yielded C1 oxygenates (formic acid, methanol) with ~78.8% selectivity.
  • Mn nanoparticle (NP) catalysts exclusively produced liquid oxygenates, achieving an outstanding 81.8% selectivity for acetic acid.
  • Distinct methane activation pathways were identified: Mn-O sites on SACs activate CH4 to *CH3 for C1 products, while NPs promote *CH2 formation leading to acetic acid via a non-classical pathway.

Conclusions:

  • Catalyst structure (single atoms vs. nanoparticles) dictates the methane activation mechanism and product distribution in DSOM.
  • MnOx/ZSM-5 nanoparticles provide a highly selective and stable route to acetic acid from methane, bypassing CO carbonylation.
  • This work offers fundamental insights into structure-sensitive methane activation and presents a practical, noble-metal-free strategy for methane valorization.