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Heterogeneous Catalysis01:22

Heterogeneous Catalysis

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Heterogeneous catalysis involves a catalyst in a different phase from the reactants. It is a process where the catalyst and the reactants are in distinct phases, typically solid and gas or liquid.Most heterogeneous catalysts are metals, metal oxides, or acids. The list includes transition metals like iron (Fe), cobalt (Co), nickel (Ni), palladium (Pd), platinum (Pt), chromium (Cr), manganese (Mn), tungsten (W), silver (Ag), and copper (Cu). These metals possess partially vacant d orbitals that...
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Thermal cycloadditions are reactions where the source of activation energy needed to initiate the reaction is provided in the form of heat. A typical example of a thermally-allowed cycloaddition is the Diels–Alder reaction, which is a [4 + 2] cycloaddition. In contrast, a [2 + 2] cycloaddition is thermally forbidden.
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Cellular processes such as building and breaking down complex molecules occur through stepwise chemical reactions. Some of these chemical reactions are spontaneous and release energy, whereas others require energy to proceed. Cells often couple the energy-releasing reaction with the energy-requiring one to carry out important cell functions. 
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Spin–Spin Coupling: Three-Bond Coupling (Vicinal Coupling)01:22

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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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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.
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Surface-Activated Coupling Reactions Confined on a Surface.

Lei Dong1, Pei Nian Liu2, Nian Lin1

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Surface-confined coupling reactions utilize solid surfaces to enable efficient chemical transformations. Advanced surface science techniques and theoretical modeling reveal reaction mechanisms and surface activation effects.

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Area of Science:

  • Surface Chemistry and Catalysis
  • Materials Science
  • Physical Chemistry

Background:

  • Chemical reactions occur in various phases, including gas, liquid, and at interfaces.
  • Surface-confined coupling reactions, where reactions occur on solid surfaces, are a rapidly growing research area.
  • These reactions leverage the unique properties of surfaces to facilitate transformations not feasible in bulk phases.

Purpose of the Study:

  • To elucidate the mechanisms of surface-confined coupling reactions, with a focus on surface activation.
  • To investigate how different metal surfaces influence reaction pathways, product morphology, and selectivity.
  • To explore the synergy between experimental surface science techniques and theoretical modeling for understanding these reactions.

Main Methods:

  • Utilized advanced surface science techniques, primarily scanning tunneling microscopy (STM) and X-ray photoelectron spectroscopy (XPS).
  • Employed theoretical modeling, specifically density-functional theory (DFT) transition-state calculations.
  • Studied well-established coupling reactions like aryl-aryl (Ullmann-type) and alkyne-alkyne (Glaser-type) on various metal surfaces.

Main Results:

  • Demonstrated that surfaces significantly lower reaction barriers and dictate reaction pathways.
  • Showed that different metal surfaces control product morphology and influence product selectivity.
  • Combined experimental and theoretical data provided unprecedented spatial and temporal insights into reaction mechanisms.

Conclusions:

  • Surface-confined coupling reactions offer efficient pathways for chemical synthesis, driven by surface activation.
  • Surface properties play a crucial role in controlling reaction outcomes, including yield and product type.
  • Further research is needed to fully understand and harness these reactions for targeted synthesis.