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Crystal Field Theory - Tetrahedral and Square Planar Complexes02:46

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Crystal field theory (CFT) is applicable to molecules in geometries other than octahedral. In octahedral complexes, the lobes of the dx2−y2 and dz2 orbitals point directly at the ligands. For tetrahedral complexes, the d orbitals remain in place, but with only four ligands located between the axes. None of the orbitals points directly at the tetrahedral ligands. However, the dx2−y2 and dz2 orbitals (along the Cartesian axes) overlap with the ligands less than the dxy,...
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To explain the observed behavior of transition metal complexes (such as colors), a model involving electrostatic interactions between the electrons from the ligands and the electrons in the unhybridized d orbitals of the central metal atom has been developed. This electrostatic model is crystal field theory (CFT). It helps to understand, interpret, and predict the colors, magnetic behavior, and some structures of coordination compounds of transition metals.
CFT focuses on...
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Developing multisite empirical force field models for Pt(II) and cisplatin.

John P Cvitkovic1, George A Kaminski1

  • 1Department of Chemistry and Biochemistry, Worcester Polytechnic Institute, 100 Institute Rd, Worcester, Massachusetts, 01609.

Journal of Computational Chemistry
|November 19, 2016
PubMed
Summary

Researchers developed new force field parameters for platinum(II) and cisplatin, enabling accurate simulations of protein-metal interactions. The POSSIM model showed superior accuracy for platinum(II) compared to OPLS-AA.

Keywords:
OPLS-AAPOSSIMPt(II)cisplatinempirical force fieldspolarizable force field

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Area of Science:

  • Computational Chemistry
  • Biophysical Chemistry
  • Materials Science

Background:

  • Accurate molecular simulations require reliable force fields for metal ions.
  • Platinum(II) and cisplatin are crucial in biological and medicinal chemistry.
  • Existing force fields often lack sufficient accuracy for platinum coordination complexes.

Purpose of the Study:

  • To develop and validate empirical force field parameters for platinum(II) and cisplatin.
  • To create transferable parameter sets compatible with protein and organic compound force fields.
  • To assess the performance of modified OPLS-AA and second-order polarizable POSSIM frameworks.

Main Methods:

  • Development of a seven-site model for the Pt(II) ion.
  • Parameterization using modified OPLS-AA and POSSIM force field frameworks.
  • Evaluation of properties including complex geometries, energies, hydration free energy, and radial distribution functions.

Main Results:

  • Both OPLS-AA and POSSIM frameworks reproduced key properties of Pt(II) and cisplatin systems.
  • The POSSIM formalism yielded more accurate quantitative results, with a 6.2% error in cisplatin formation energy versus 9.9% for OPLS-AA.
  • Developed parameter sets demonstrated transferability for protein-metal binding simulations.

Conclusions:

  • The developed force field parameters are suitable for simulating platinum(II) and cisplatin in biological contexts.
  • The second-order polarizable POSSIM model offers enhanced accuracy for platinum coordination chemistry.
  • These parameters facilitate unconstrained protein-metal binding simulations.