Study On The Photoluminescent And Thermal Properties Of Zinc Complexes With A N6o4 Macrocyclic Ligand

Reactions between a N6O4 macrocyclic ligand (L-1) and several Zn(II) salts (trifluoromethane sulfonate, p-toluenesulfonate, acetate, benzoate, o-, m- or p-hydroxybenzoate) led to the formation of seven complexes, [Zn2L1 (DMSO)(4)](OSO2CF3)(4) (1), [Zn-2(p-OSO2PhCH3)(4)L-1] (2), [Zn-2(OCOCH3)(4)L-1] (3), [Zn-2(OCOPh)(4)L-1] (4), [Zn-2(o-OCOPhOH)(4)L-1] (5), [Zn-2(m-OCOPhOH)(4) L-1] (6) and [Zn-2(p-OCOPhOH)(4) L-1] (7), which were characterized by elemental analysis, H-1-NMR, C-13-NMR, IR, fluorescence spectroscopies and single crystal X-ray diffraction. In 1, the Zn atom is pentacoordinated with a N3O2 irregular trigonal bipyramidal coordination environment, like the geometries in compounds 3-7, whereas in structure 2 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.