Our two original approaches, the first based on the topological (connectivity) index3χvand the second based on the model of overlapping spheres (OS), were applied for the estimation of stability constants of copper(II) complexes (CuL) with ethylenediamines (N = 14) and diethylenetriamines (N = 8), and mixed complexes (CuLA) of amino acids and diethylenetriamines (N = 18). The stability constants of the ethylenediamine complexes were predicted "indirectly" from calibration models developed on diethylenetriamines and vice versa, and also by a more direct method using the leave-one-out procedure of cross validation (cv). By averaging all the estimates, stability constants were reproduced with a rms error of 0.56 and 0.43 log K units for diethylenetriamines and ethylenediamines, respectively. Stability constants of the mixed complexes (CuLA) were estimated with S.E.cv= 0.69 log K units (the best linear regression) and S.E.cv= 0.53 log K units (the best binomial regression). The best bivariate regression with the indicator variable, In = 1 for CuLA, In = 0 for CuL, combining stability constants of CuL and CuLA, gave S.E.cv= 0.67 log K units. © 2007 Elsevier Ltd. All rights reserved.
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