Study on the Photoluminescent and Thermal Properties of Zinc Complexes with a N₆O₄ Macrocyclic Ligand.

Reactions between a N₆O₄ macrocyclic ligand (L¹) and several Zn(II) salts (trifluoromethane sulfonate, -toluenesulfonate, acetate, benzoate, -, - or -hydroxybenzoate) led to the formation of seven complexes, Zn₂L¹ (DMSO)₄₄ (), [Zn₂(-OSO₂PhCH₃)₄L¹] (), [Zn₂(OCOCH₃)₄L¹] (), [Zn₂(OCOPh)₄L¹] (), [Zn₂(-OCOPhOH)₄L¹] (), [Zn₂(-OCOPhOH)₄ L¹] () and [Zn₂(-OCOPhOH)₄ L¹] (), which were characterized by elemental analysis, ¹H-NMR, C-NMR, IR, fluorescence spectroscopies and single crystal X-ray diffraction. In , the Zn atom is pentacoordinated with a N₃O₂ irregular trigonal bipyramidal coordination environment, like the geometries in compounds ⁻, whereas in structure the metal atom is envisaged as possessing a distorted N₃O₃ octahedronal environment. All the compounds show interesting photoluminescent properties in solid states and solutions in DMF and DMSO, which are reported along with their TG-DTA thermal decomposition processes, UV-vis absorption spectroscopy and fluorescence quantum yields in DMF and DMSO.