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This study introduces a new method, SQE_AB, for calculating partial atomic charges in charged periodic frameworks like zeolites. It accurately captures chemical structure, improving simulations of guest-host interactions.

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Area of Science:

  • Materials Science
  • Computational Chemistry
  • Solid-State Physics

Background:

  • Periodic frameworks with net charges, such as zeolites, are crucial in various applications.
  • Accurate partial atomic charges are essential for simulating guest-host interactions within these materials.

Purpose of the Study:

  • To investigate and validate methods for generating partial atomic charges in charged periodic systems.
  • To address limitations of existing methods for handling net framework charges.

Main Methods:

  • Examined REPEAT electrostatic potential fitted charges using periodic electronic structure calculations with a neutralizing background charge.
  • Reformulated the split charge equilibration (SQE) method into SQE_AB (atomic basis) to handle non-neutral systems.
  • Validated SQE_AB against REPEAT charges and the original SQE model using metal-organic frameworks and zeolites.

Main Results:

  • The SQE_AB method provides results equivalent to the original SQE model for neutral systems.
  • SQE_AB successfully captures the chemical structure of charged frameworks.
  • The new SQE_AB method demonstrates improved accuracy compared to the standard charge equilibration model for charged systems.

Conclusions:

  • The reformulated SQE_AB method is a reliable approach for generating partial atomic charges in both neutral and charged periodic frameworks.
  • This advancement facilitates more accurate simulations of guest-host interactions in important materials like zeolites.