Lateral macrobicyclic tricompartmental ligands: synthetic, spectral, magnetic, electrochemical and kinetic aspects of binuclear copper(II) complexes

Biological evaluation of dinuclear copper complex/dichloroacetic acid cocrystal against human breast cancer: design, synthesis, characterization, DFT studies and cytotoxicity assays

Binuclear copper(ii) cocrystal “[Cu₂(valdien)₂⋯2Cl₂CHCOOH],” 1 was synthesized from H₂valdien scaffold and anticancer drug pharmacophore “dichloroacetic acid” embedded with two Cu(ii) connected via a hydrogen bonded network.

Binuclear copper complexes: synthesis, X-ray structure and interaction study with nucleotide/protein by in vitro biochemical and electrochemical analysis

Two new, binuclear copper(II) hydrazone complexes have been synthesized and characterized by various physico-chemical techniques including single crystal X-ray diffraction. Interaction of these complexes with nucleotide and protein were analyzed by in vitro biochemical and electrochemical analysis. Both the complexes exhibited intercalative mode of binding with DNA. Further, gel electrophoresis assay demonstrated the ability of the complexes to cleave the supercoiled pBR322 plasmid DNA to nicked circular DNA form. Cytotoxicity of the complexes performed against a panel of cancer cell lines and a normal cell line proved that these complexes are potentially cytotoxic against the cancerous cell lines, particularly with IC50 as low as 0.7 μM against HeLa cell line.

Zn(3), Ni(3), and Cu(3) complexes of a novel tricompartmental acyclic ligand

A new tricompartmental acyclic ligand (H(4)L) was prepared and fully characterized. It reacts with zinc, nickel, and copper(II) acetate to yield [Zn(3)L(OAc)(2)].H(2)O (1.H(2)O), [Ni(3)L(OAc)(2)(MeOH)(2)].2MeCN.2MeOH (2.2MeCN.2MeOH), and [Cu(3)L(OAc)(2)].3H(2)O (3.3H(2)O), respectively. 2.2MeCN.2MeOH precipitates as single crystals, which lose the solvates upon drying to give 2. The reactivity of the acetate complexes in a methanol/acetonitrile basic medium in air was investigated. Thus, 1.H(2)O and 2 are unstable in this medium, both suffering partial hydrolysis to produce single crystals of [Zn(3)L(3-Br-5-Cl-Sal)(2)].2MeCN (4.2MeCN; 3-Br-5-Cl-Sal(-) = 3-bromo-5-chlorosalicylaldehydate) and [Ni(3)L(3-Br-5-Cl-Sal)(2)].2MeCN (5.2MeCN) as one of the reaction byproducts, while 3.3H(2)O gives rise to a reaction of ligand displacement, generating crystals of [Cu(3)L(OMe)(2)].MeOH (6.MeOH). Complexes 2.2MeCN.2MeOH, 4.2MeCN, 5.2MeCN, and 6.MeOH were crystallographically characterized, and these studies demonstrate not only the trinucleating ability of the fully deprotonated L(4-) ligand but also its tendency to induce chirality in the isolated compounds. The magnetic characterization of 2, 3.3H(2)O and 6.MeOH shows that the magnetic coupling between adjacent metal ions is weak, with 2 being ferromagnetic and 3.3H(2)O and 6.MeOH antiferromagnetic.