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Systematic theoretical investigation of the zero-field splitting in Gd(III) complexes: wave function and density
Shehryar Khan1, Aleksandra Kubica-Misztal2, Danuta Kruk3
1Department of Physics, Stockholm University, AlbaNova University Center, S-106 91 Stockholm, Sweden.
The Journal of Chemical Physics
|January 24, 2015
Summary
Multiconfigurational methods accurately predict zero-field splitting (ZFS) in gadolinium(III) complexes, unlike density functional theory approximations. This advancement aids understanding of paramagnetic ion structures for diverse applications.
Area of Science:
- Physical Chemistry
- Computational Chemistry
- Materials Science
Background:
- Zero-field splitting (ZFS) in paramagnetic ions is crucial for understanding electronic and molecular structure.
- ZFS variations impact fields from fundamental physical chemistry to medical applications.
Purpose of the Study:
- To assess the accuracy of computational methods for ZFS calculations in Gd(III) complexes.
- To compare multiconfigurational complete-active-space self-consistent field (CASSCF) wave functions with density functional theory (DFT) calculations.
Main Methods:
- Detailed analysis of ZFS in symmetric Gd(III) complexes.
- Application of CASSCF and DFT computational schemes to various Gd(III) complexes, including Gd(III)DOTA(H2O)(-), Gd(III)DTPA(H2O)(2-), and Gd(III)(H2O)8(3+).
Main Results:
- Multiconfigurational methods provided ZFS results on the correct order of magnitude for Gd(III) complexes.
- DFT approximations failed to accurately predict the ZFS of Gd(III) complexes.
Conclusions:
- Multiconfigurational methods are more reliable for calculating ZFS in Gd(III) complexes compared to DFT.
- Accurate ZFS prediction is vital for leveraging paramagnetic ions in diverse scientific and medical fields.
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