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Updated: Jan 17, 2026

Structure and Coordination Determination of Peptide-metal Complexes Using 1D and 2D 1H NMR
Published on: December 16, 2013
Copper(II) Complexes with Schiff Bases Derived from 2-Pyridinecarbaldehyde N-Oxide and Amino Acids: Studies on DNA,
Jindra Valentová1, Adrian Humboldt2,3, Lucia Lintnerová1
1Department of Chemical Theory of Drugs, Faculty of Pharmacy, Comenius University in Bratislava, Odbojárov 10, 832 32, Bratislava, Slovakia.
Abstract:
Synthesis of the first example of metal complexes containing Schiff-base ligands derived from amino acids and aldehyde with N-oxide functionality is presented. Five copper(II) complexes with the compositions [Cu(L1)(H2O)(OAc)]⋅H2O (1), [Cu3(L2)2Cl4(H2O)2] (2), [Cu4(L2)2Cl6(MeOH)2] (3), [Cu2(L3)Cl3(H2O)] (4), and [Cu3(L3)2Cl3(H2O)3]Cl (5) (where anionic ligands L1 - L3 are Schiff bases obtained by condensation of 2-pyridinecarbaldehyde N-oxide with 2-aminoisobutyric acid (HL1), β-alanine (HL2), and 3-aminobutanoic acid (HL3)) were prepared by template synthesis and fully crystallographically characterized. Complexes 1 - 4 were examined for DNA interactions, competitive studies with EB-DNA, viscosity measurements, DNA cleavage studies, cytotoxicity studies, interactions with bovine serum albumin (BSA), and theoretical docking studies. The studied complexes bind to the helix through a nonintercalative binding mode; the interaction of complexes with ctDNA is predominantly via intercalation, while viscosity measurements indicate mostly groove binding. DNA cleavage studies revealed the highest cleavage activity for complex 1. The MTT assay on three human cell lines shows the highest cytotoxic effect for complex 1 against HepG2 (human liver cancer cell line). Experimental interaction of studied complexes with BSA indicates an intermediate binding strength between complexes and albumin, while theoretical docking studies identify possible binding sites of complexes within the BSA.
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