Synthesis and characterization of novel square planar copper(II)–dipeptide–1,10-phenanthroline complexes: Investigation of their DNA binding and cleavage properties

Tetranuclear copper(ii) cubane complexes derived from self-assembled 1,3-dimethyl-5-(o-phenolate-azo)-6-aminouracil: structures, non-covalent interactions and magnetic property

A new doubly opened 4 + 2 Cu₄O₄ cubane cluster exhibits strong antiferromagnetic exchange coupling with J₁ = −110.1 cm⁻¹, and J₂ = −27.1 cm⁻¹.

The water soluble peripherally tetra-substituted zinc(ii), manganese(iii) and copper(ii) phthalocyanines as new potential anticancer agents

In this study, [2-(2-morpholin-4-ylethoxy)ethoxy] group substituted zinc(ii), manganese(iii) and copper(ii) phthalocyanines 2–4 and their water soluble derivatives 2a, 3a and 4a were synthesized and the interactions of compounds 2a, 3a and 4a with CT-DNA and supercoiled pBR322 plasmid DNA were investigated.

DNA binding, photo-induced DNA cleavage and cytotoxicity studies of lomefloxacin and its transition metal complexes

This work was focused on a study of the DNA binding and cleavage properties of lomefloxacin (LMF) and its ternary transition metal complexes with glycine. The nature of the binding interactions between compounds and calf thymus DNA (CT-DNA) was studied by electronic absorption spectra, fluorescence spectra and thermal denaturation experiments. The obtained results revealed that LMF and its complexes could interact with CT-DNA via partial/moderate intercalative mode. Furthermore, the DNA cleavage activities of the compounds were investigated by gel electrophoresis. Mechanistic studies of DNA cleavage suggest that singlet oxygen ((1)O2) is likely to be the cleaving agent via an oxidative pathway, except for Cu(II) complex which proceeds via both oxidative and hydrolytic pathways. Antimicrobial and antitumor activities of the compounds were also studied against some kinds of bacteria, fungi and human cell lines.

Mononuclear Cu(ii) and Zn(ii) complexes with a simple diamine ligand: synthesis, structure, phosphodiester binding and DNA cleavage studies

Mononuclear Cu(ii) and Zn(ii) complexes with simple 1,2-diaminocylohexane were synthesized. They interact with phosphodiesters and CT-DNA. Cu(ii) complex with ascorbate efficiently cleaves supercoiled DNA up to Form III at 25 µM under oxidative pathway.

Cu(II)-dipeptide complexes of 2-(4'-thiazolyl)benzimidazole: synthesis, DNA oxidative damage, antioxidant and in vitro antitumor activity

Two new Cu(II)-dipeptide complexes of 2-(4'-thiazolyl)benzimidazole, [Cu(Gly-Gly)(TBZ)(Cl)]·4H2O (1) and [Cu(Gly-l-Leu)(TBZ)(Cl)]·H2O (2) (Gly-Gly=glycyl-glycine anion, Gly-l-Leu=glycyl-l-leucine anion and TBZ=2-(4'-thiazolyl)benzimidazole) have been synthesized and characterized by elemental analyses, molar conductance measurements and spectroscopy methods (IR, UV-visible, electrospray ionization mass spectra (ESI-MS) and EPR). The DNA binding and cleavage properties of the complexes monitored by multi-spectroscopic techniques (UV absorption, fluorescence and circular dichroism), viscosity determination and agarose gel electrophoresis indicated that the complexes bound to calf thymus (CT)-DNA via a partial intercalative mode with considerable intrinsic binding constants (Kb=1.64×10(5)M(-1) for 1 and 2.59×10(5)M(-1) for 2), and cleaved pBR322 DNA efficiently in the mediation of ascorbic acid (AA), probably via an oxidative damage mechanism induced by OH. The antioxidant activities of the complexes have been evaluated by means of modified nitroblue tetrazolium (NBT) photoreduction and cellular antioxidant activity (CAA) assays using HepG2 cells as a model, and it was found that IC50 values of 1 and 2 for dismutation of O2(-) were 0.172 and 0.247μM, respectively, and the CAA50 values were 10.57 and 10.74μM. In addition, the complexes were subjected to in vitro cytotoxicity against three human carcinoma cell lines (HeLa, A549 and HepG2), which revealed that the complexes exhibited effective cytotoxicity (IC50 values varying from 33.17 to 100μM) and selective inhibition toward HeLa cell lines. These findings indicate that the complexes have the potential to act as effective metallopeptide chemotherapeutic agents.

Anticancer metallodrugs of glutamic acid sulphonamides: in silico, DNA binding, hemolysis and anticancer studies

In response to an increased demand for effective anticancer drugs, a series of disodium sulphonamides ofl-glutamic acid (L1–L3) was synthesized. Sulphonamides were complexed with copper(ii), nickel(ii) and ruthenium(iii) ions, separately and respectively.

Behaviour of zinc complexes and zinc sulphide nanoparticles revealed by using screen printed electrodes and spectrometry

In this study, we focused on microfluidic electrochemical analysis of zinc complexes (Zn(phen)(his)Cl₂, Zn(his)Cl₂) and ZnS quantum dots (QDs) using printed electrodes. This method was chosen due to the simple (easy to use) instrumentation and variable setting of flows. Reduction signals of zinc under the strictly defined and controlled conditions (pH, temperature, flow rate, accumulation time and applied potential) were studied. We showed that the increasing concentration of the complexes (Zn(phen)(his)Cl₂, Zn(his)Cl₂) led to a decrease in the electrochemical signal and a significant shift of the potential to more positive values. The most likely explanation of this result is that zinc is strongly bound in the complex and its distribution on the electrode is very limited. Changing the pH from 3.5 to 5.5 resulted in a significant intensification of the Zn(II) reduction signal. The complexes were also characterized by UV/VIS spectrophotometry, chromatography, and ESI-QTOF mass spectrometry.