Journal of Molecular Modeling

, Volume 12, Issue 4, pp 373–389 | Cite as

Lanthanide complex coordination polyhedron geometry prediction accuracies of ab initio effective core potential calculations

  • Ricardo O. Freire
  • Gerd B. Rocha
  • Alfredo M. Simas
Original paper

Abstract

The ability to efficiently and accurately predict solid-state geometries of lanthanide coordination compounds efficiently and accurately is central for the design of new ligands capable of forming stable and highly luminescent complexes. Accordingly, we present in this paper a report on the capability of various ab initio effective core potential calculations in reproducing the coordination polyhedron geometries of lanthanide complexes. Starting with all combinations of HF, B3LYP and MP2(Full) with STO-3G, 3-21G, 6-31G, 6-31G* and 6-31+G basis sets for [Eu(H2O)9]3+ and closing with more manageable calculations for the larger complexes, we computed the fully predicted ab initio geometries for a total of 80 calculations on 52 complexes of Sm(III), Eu(III), Gd(III), Tb(III), Dy(III), Ho(III), Er(III) and Tm(III), the largest containing 164 atoms. Our results indicate that RHF/STO-3G/ECP appears to be the most efficient model chemistry in terms of coordination polyhedron crystallographic geometry predictions from isolated lanthanide complex ion calculations. Moreover, both augmenting the basis set and/or including electron correlation generally enlarged the deviations and aggravated the quality of the predicted coordination polyhedron crystallographic geometry. Our results further indicate that Cosentino et al.’s suggestion of using RHF/3-21G/ECP geometries appears to be indeed a more robust, but not necessarily, more accurate recommendation to be adopted for the general lanthanide complex case.

Figure

Graphical visualization of unsigned mean errors, UME(Eu-L)s, involving only the interatomic distances between the europium central ion and the oxygen atoms of the coordination polyhedron of the cation nona-aqua-europium(III) for various model chemistries, all compared to the “Cambridge Structural Database 2004” crystallographic geometry

Keywords

Lanthanide Rare-earth Ab initio ECP 

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Copyright information

© Springer-Verlag 2006

Authors and Affiliations

  • Ricardo O. Freire
    • 1
  • Gerd B. Rocha
    • 1
  • Alfredo M. Simas
    • 1
  1. 1.Departamento de Química FundamentalUniversidade Federal de PernambucoRecifeBrazil

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