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Structural confinement in crystals enables selective carbon dioxide (CO2) insertion into copper hydride complexes. This study reveals how crystal lattice effects, like site asymmetry, control CO2 reactivity for potential fuel synthesis.

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Area of Science:

  • * Inorganic Chemistry
  • * Materials Science
  • * Computational Chemistry

Background:

  • * Carbon dioxide (CO2) is a crucial C1 feedstock for synthesizing fuels and chemicals.
  • * Previous work showed CO2 insertion into a [Cu2H2] core via solid-gas reaction, forming unstable formate species.
  • * Understanding crystal lattice effects on reactivity is key for designing new catalytic processes.

Purpose of the Study:

  • * To elucidate the mechanism by which structural confinement enables selective CO2 insertion into a [Cu2H2] core.
  • * To investigate the role of co-crystallized solvent molecules (tetrahydrofuran) in modulating reactivity.
  • * To provide a computational framework for understanding crystal- vs. solution-phase reactivity differences.

Main Methods:

  • * Multiscale computational approach combining molecular mechanics (MM) and hybrid quantum mechanics/molecular mechanics (QM/MM) molecular dynamics.
  • * Enhanced-sampling free energy calculations to determine CO2 binding affinities and reaction pathways.
  • * Analysis of site asymmetry induced by co-crystallized molecules.

Main Results:

  • * Co-crystallized tetrahydrofuran induces site asymmetry around the [Cu2H2] core, affecting electronic environment and CO2 diffusion.
  • * Site asymmetry significantly modulates CO2 binding affinities and dictates reaction pathways.
  • * Demonstrated key differences between crystal- and solution-phase CO2 insertion and hydride transfer mechanisms.

Conclusions:

  • * Crystal lattice confinement, specifically site asymmetry, is crucial for enabling selective CO2 insertion and stabilizing reactive intermediates.
  • * The findings offer a generalizable framework for understanding how solid-state environments influence chemical reactivity.
  • * This work provides mechanistic insights for designing catalysts that leverage lattice confinement for efficient CO2 utilization.