Structural variety, fluorescence and photocatalytic activity of dissymmetric thiosemicarbazone complexes

A new dissymmetric bis(thiosemicarbazone) ligand, H2L2, containing a 4-(1-naphthyl)-3-thiosemicarbazone branch has been easily prepared and characterized. The reactivity of this ligand the hybrid isopropylthiosemicarbazone/naphtoylhydrazone, H2L1, with zinc(II), copper(II) nickel(II) nitrates in presence different amounts lithium hydroxide explored. results show that although both ligands present two acidic protons, degree deprotonation cannot be selectively controlled, since almost all reactions carried out without base is at least singly deprotonated. Nevertheless, an interesting structural diversity found, also influenced by metal preferences, leading to formation monomeric (1–5, 8 9), dimeric (6) polymeric (7) species. ligands, together or absence nitrate ions solvent molecules, lead supramolecular architectures based on hydrogen bond arrays. Fluorescence spectroscopy solid state for complexes was performed whereas H2L1 fluorescent, H2L2 no fluorescence emission detected. Complexation leads, general, quench emission, except complex [ZnL1(EtOH)] 2, which much more fluorescent than free ligand. Conversely, complexation zinc(II) causes emission. Photocatalytic experiments nickel copper shows four can effectively degrade methyl orange under UV–vis irradiation.