Design, synthesis, characterization and antibacterial properties of copper(II) complexes with chromone-derived compounds

New Copper(I) Complex with a Coumarin as Ligand with Antibacterial Activity against Flavobacterium psychrophilum

A new copper (I) complex, [Cu(NN₁)₂](ClO₄)_, was synthesized, where NN₁ was a imine ligand 6-((quinolin-2-ylmethylene)amino)-2H-chromen-2-one obtained by a derivatization of natural compound coumarin. The structural characterization in solution was done by NMR techniques, UV-Vis and cyclic voltammetry. The potential antibacterial effect of [Cu(NN₁)₂](ClO₄)_, was assessed for F. psychrophilum isolated 10094. F. psychrophilum is a Gram-negative bacterium which causes diseases such as bacterial cold-water disease and rainbow trout fry syndrome, causing large economic losses in the freshwater salmonid aquaculture industry. This complex show to have antibacterial activity against F. psychrophilum 10094 at non-cytotoxic concentration in cell line derived from trout (F. psychrophilum 10094 IC₅₀ 16.0 ± 0.9; RT-GUT IC₅₀ 53.0 ± 3.1 µg/mL).

Antibacterial, Cytotoxic Studies and Characterization of Some Newly Synthesized SymmetricalN3,N3′-Bis(disubstituted)isophthalyl-bis(thioureas) and Their Cu(II) and Ni(II) Complexes

A series of some novelN3,N3′-bis(disubstituted)isophthalyl-bis(thioureas) compounds with general formula [C6H4·{CONHCSNHR}2], where R = 2-ClC6H4S (L1), 3,5-(Cl)2C6H3(L2), 2,4-(Cl)2C6H3(L3), 2,5-(Cl)2C6H3(L4), and 2-NH2C6H4(L5), and their Cu(II) and Ni(II) complexes (C1–C10) have been synthesized. These compounds (L1–L5) and their metal(II) complexes (C1–C10) have been characterized by elemental analysis, infrared spectroscopy,1H NMR and13C NMR spectroscopy, magnetic moments, and electronic spectral measurements. The ligands are coordinated to metal atom in a bidentate pattern producing a neutral complex of the type [ML]2. These compounds (L1–L5) and their metal(II) complexes (C1–C10) were also screened for their antibacterial and cytotoxic activities.