Sparkle model for the AM1 calculation of dysprosium (III) complexes

The Sparkle/AM1 model, recently defined for Eu(III), Gd(III) and Tb(III) [R.O. Freire, G.B. Rocha, A.M. Simas, Inorg. Chem. 44 (2005) 3299] is extended to Dy(III) complexes, using the same parameterization scheme. Thus, a set of fifteen complexes, with various representative ligands of high crystallographic quality (R-factor < 0.05 Å) and which possess oxygen and/or nitrogen as coordinating atoms, was used as the training set. For the thirty complexes of the test set, the Sparkle/AM1 unsigned mean error, for all interatomic distances between the Dy(III) ion and the oxygen or nitrogen ligand atoms of the first sphere of coordination, is 0.07 Å, a level of accuracy useful for luminescent complex design.