Modeling lanthanide complexes: sparkle/AM1 parameters for ytterbium (III).

Area of Science:

• Computational Chemistry
• Inorganic Chemistry
• Materials Science

Background:

• Accurate prediction of metal-ligand interactions is crucial for designing functional inorganic complexes.
• Existing computational methods for predicting ytterbium (III) complex geometries can be computationally expensive.
• The Sparkle/AM1 model has shown promise for other metal ions but required extension to ytterbium (III).

Purpose of the Study:

• To extend the Sparkle/AM1 model for accurate geometric predictions of ytterbium (III) complexes.
• To validate the model's performance using a diverse set of high-quality crystallographic data.
• To assess the potential of the model for accelerating the design of luminescent ytterbium (III) materials.

Main Methods:

• A training set of 15 ytterbium (III) complexes with oxygen and/or nitrogen coordinating atoms was selected from the Cambridge Crystallographic Database.
• The Sparkle/AM1 model was applied to predict interatomic distances between the Yb(III) ion and its first coordination sphere ligands.
• A validation set of 32 additional high-quality crystallographic structures was used to assess the model's accuracy.

Main Results:

• The extended Sparkle/AM1 model achieved an unsigned mean error of 0.07 Å for Yb(III)-ligand distances across 47 complexes.
• This accuracy is comparable to current ab initio/ECP methods for geometry prediction.
• The Sparkle/AM1 model demonstrated a significant speed advantage, being hundreds of times faster than traditional methods.

Conclusions:

• The Sparkle/AM1 model is successfully extended and validated for predicting ytterbium (III) complex geometries.
• This computationally efficient method provides a valuable tool for the rational design of novel luminescent ytterbium (III) complexes.
• The model's speed and accuracy facilitate rapid exploration of chemical space for materials discovery.