Abstract
Stability constants of the ternary palladium (II) complexes of triamines (diethylenetriamine(dien) and 2,2′:6′,2″-terpyridine(terpy) and nucleobases (1-methyl-cytosine(M e C), 9-methyladenine(M e A), 1-methyluracil(MeUH), 1-methylthymine(MeTH), 9-ethylguanine(EtGH), uridine, ioosine) or derivatives of amino acids (N-acetylhistamine(Ac-Hm), N-acetylhistidine(Ac-His) and N-acetyllysine(Ac-Lys)) were determined by pH-metric titrations. Binding sites of the ligands in the ternary complexes were elucidated by 1H-nuclear magnetic resonance spectroscopy. It was found that all ligands form stable adducts with [Pd(terpy)] 2+ and [Pd(dien)] 2+, except the [Pd(terpy)Cl] +/Ac-Lys system, where the formation of the mixed hydroxo complex tem, where the formation of the mixed hydroxo complex [Pd(terpy)(OH)] + predominates. The formation of dinuclear complexes of [Pd(terpy)] 2+ and [Pd(dien)] 2+ was identified with Ac-Hm and Ac-His (imidazole-N3 / N1) and inosine and EtGH (purine-N1 / N7). The [(Pd(terpy)) 2LH −1] 3+ dinuclear species were detected in slightly acidic media in the ternary systems containing MeC or MeA, in which one of the [Pd(terpy)] 2+ units is bonded to N3 of MeC or N1 of MeA, while the second palladium(II) is coordinated by the deprotonate exocyclic amino groups of the ligands.
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