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Spin density accuracy and distribution in azido Cu(II) complexes: A source function analysis.

Giovanni Macetti1, Leonardo Lo Presti1, Carlo Gatti2

  • 1Department of Chemistry, Università degli Studi di Milano, via Golgi 19, Milano, I-20133, Italy.

Journal of Computational Chemistry
|January 10, 2018
PubMed
Summary
This summary is machine-generated.

Accurately determining spin density (SD) in magnetic molecules is challenging. The Source Function tool reveals that DFT methods overestimate spin delocalization in dicopper complexes, while CAS(10,10) calculations better match experimental data.

Keywords:
azido Cu dinuclear complexessource functionspin densityspin density accuracyspin information transmission

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Area of Science:

  • Quantum Chemistry
  • Magnetochemistry
  • Materials Science

Background:

  • Magnetic properties of open-shell systems are dictated by unpaired electron density distribution.
  • Accurate determination and interpretation of spin density (SD) from experimental (polarized neutron diffraction - PND) and theoretical (quantum chemical) methods remain challenging.
  • The Source Function is a valuable tool for analyzing and interpreting SD distributions.

Purpose of the Study:

  • To analyze and compare theoretical spin density distributions in weakly (end-end azido) and strongly (end-on) coupled dicopper complexes.
  • To evaluate the accuracy of different computational approaches (CASSCF, DFT, UHF) in describing spin density.
  • To utilize the Source Function to elucidate the origins of SD differences between complexes and methods.

Main Methods:

  • Application of the Source Function to analyze theoretical spin density (SD) distributions.
  • Comparison of SD from CASSCF, DFT, and UHF computational methods.
  • Utilizing partial Source Function reconstructions with subsets of atoms for detailed analysis.
  • Comparison of theoretical SD with experimental PND data.

Main Results:

  • The Source Function effectively highlights differences in SD between end-end and end-on dicopper complexes and across computational methods.
  • DFT methods were found to exaggerate electron sharing between copper and ligands, leading to overestimated spin delocalization and metal-ligand spin polarization.
  • CASSCF methods, particularly CAS(10,10), showed better agreement with PND experimental data compared to DFT and UHF, indicating more accurate spin information transmission between atoms.

Conclusions:

  • The Source Function provides crucial insights into the accuracy and origins of spin density calculations.
  • DFT overestimates spin delocalization in these dicopper systems, while CAS(10,10) offers a more reliable description of spin density compared to experimental PND data.
  • Accurate spin density determination is critical for understanding and predicting the magnetic properties of open-shell molecular systems.