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A QM/MM program using frozen localized orbitals and the Huzinaga equation

  • Bence Hégely
  • Ferenc Bogár
  • György G. FerenczyEmail author
  • Mihály Kállay
Chapter
Part of the Highlights in Theoretical Chemistry book series (HITC, volume 12)

Abstract

A mixed QM/MM computer program coupling Amber and MRCC is presented. This is the first implementation of the Huzinaga equation-based local self-consistent field (HLSCF) method that makes it possible to calculate ab initio wave functions without orthogonalizing the basis set to the frozen orbitals separating the QM and MM subsystems. A significant novelty of the program is that it includes an automatic generation of the frozen localized orbitals obtained from calculations performed for model molecules cut out of the system. The AmberMrcc code also allows the use of the link atom (LA) approach. Sample calculations were performed to check the performance of both the HLSCF and the LA approaches by describing the interactions between the QM and MM subsystems with electrostatic embedding. It was found that the conceptually appealing HLSCF method is a competitive alternative to the LA method.

Keywords

Mixed quantum mechanics/molecular mechanics Huzinaga equation-based local self-consistent field (HLSCF) Frozen strictly localized molecular orbital Link atom 

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Copyright information

© Springer-Verlag Berlin Heidelberg 2016

Authors and Affiliations

  • Bence Hégely
    • 1
  • Ferenc Bogár
    • 2
  • György G. Ferenczy
    • 3
    Email author
  • Mihály Kállay
    • 1
  1. 1.MTA-BME Lendület Quantum Chemistry Research Group, Department of Physical Chemistry and Materials ScienceBudapest University of Technology and EconomicsBudapestHungary
  2. 2.MTA-SZTE Supramolecular and Nanostructured Materials Research GroupUniversity of SzegedSzegedHungary
  3. 3.Medicinal Chemistry Research Group, Research Centre for Natural SciencesHungarian Academy of SciencesBudapestHungary

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