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Related Concept Videos

Cycloaddition Reactions: MO Requirements for Photochemical Activation01:12

Cycloaddition Reactions: MO Requirements for Photochemical Activation

Some cycloaddition reactions are activated by heat, while others are initiated by light. For example, a [2 + 2] cycloaddition between two ethylene molecules occurs only in the presence of light. It is photochemically allowed but thermally forbidden.
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Photosystem I

Although structurally similar to photosystem II (PSII), photosystem I (PSI) is has a different electron supplier and electron acceptor.
Both these photosystems work in concert. An excited electron from PSII is relayed to PSI via an electron transport chain in the thylakoid membrane of the chloroplast, which is comprised of the carrier molecule plastoquinone, the dual-protein cytochrome complex, and plastocyanin. As electrons move between PSII and PSI, they lose energy and must be re-energized...
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Photosystem II

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Olefin Metathesis Polymerization: Acyclic Diene Metathesis (ADMET)00:53

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Acyclic diene metathesis polymerization or ADMET polymerization involves cross-metathesis of terminal dienes, such as 1,8-nonadiene, to give linear unsaturated polymer and ethylene. As ADMET is a reversible process, the formed ethylene gas must be removed from the reaction mixture to complete the polymerization process.
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The reaction of weakly electrophilic aryldiazonium (also called arenediazonium) salts with highly activated aromatic compounds leads to the formation of products with an —N=N— link, called an azo linkage. This reaction, presented in Figure 1, is known as diazo coupling and occurs without the loss of the nitrogen atoms of the aryldiazonium salt. Highly activated aromatic compounds such as phenols or arylamines favor the diazo coupling reaction. The coupling generally occurs at the para position.

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Area of Science:

  • Physical Chemistry
  • Computational Chemistry

Background:

  • Nonadiabatic deactivation is crucial for understanding excited-state dynamics.
  • Trans-azomethane's behavior in different environments is not fully understood.

Purpose of the Study:

  • To investigate the nonadiabatic deactivation pathways of trans-azomethane.
  • To elucidate the role of solvent effects on excited-state dynamics and dissociation.

Main Methods:

  • On-the-fly surface-hopping simulations.
  • Quantum mechanical/molecular mechanics (QM/MM) approach.
  • Generalized valence bond perfect-pairing complete active space calculations.

Main Results:

  • Nonadiabatic deactivation is dominated by CNNC torsion, hindered by solvent interactions.
  • Solvent electrostatic effects play a minor role in the deactivation process.
  • Lifetimes increase by ~20 fs in both polar and nonpolar solvents compared to the gas phase.

Conclusions:

  • Solvent mechanical interactions significantly influence trans-azomethane deactivation dynamics.
  • The solvent cage suppresses C-N bond dissociation, impacting excited-state lifetimes.
  • Computational methods provide insights into solvent effects on molecular excited states.