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Graph-Theoretical Modelling of Stability Constants of Copper(II) Complexes with Tripeptides Containing Glycine, Glutamic acid, and Histidine

Logarithms of stability constants, log¢, of copper(II) complexes with tripeptides containing glycine, glutamic acid, and histidine were modelled with 3»v connectivity index. The model developed on complexes with tripeptides formed of Gly and Glu yielded S.E. = 0.47, 0.38, and 0.55, depending on whether CuL, CuH¹1L, or CuH¹2L complexes were taken as referent. The model was also applied to complexes with tripeptides containing His, S.E. = 1.47, 1.39, and 1.80. Although a somewhat worse result for G/E/H tripeptide complexes, much bigger range of their log¢’s (29.648), in contrast to 16.671 for G/E tripeptide complexes, has to be borne in mind.

Coordination compounds; Peptides; Stability constants; Topological indices

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