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

Abstract

Reactions between a N6O4 macrocyclic ligand (L1) 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), [Zn2(p-OSO2PhCH3)4L1] (2), [Zn2(OCOCH3)4L1] (3), [Zn2(OCOPh)4L1] (4), [Zn2(o-OCOPhOH)4L1] (5), [Zn2(m-OCOPhOH)4 L1] (6) and [Zn2(p-OCOPhOH)4 L1] (7), which were characterized by elemental analysis, 1H-NMR, 13C-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.

Zinc(II) Terpyridine Complexes: Substituent Effect on Photoluminescence, Antiproliferative Activity, and DNA Interaction

“…Square planar and octahedral metal complexes with TPY ligands have been reported to be of great biological interest, and complexes exhibiting planar structures can easily insert themselves in DNA base pairs [29][30][31]. Zinc, being one of the most important trace metals for human being, appears as an attractive metal due to its importance in the regulation of the metabolism of cells, cytoprotective effect, and suppressing the apoptotic pathways [32][33][34][35][36]. Zinc TPY complexes are good candidates for photo-activated processes and they can be used in PDT [37][38][39].…”

Silver complexes with substituted terpyridines as promising anticancer metallodrugs and their crystal structure, photoluminescence, and DNA interactions

“…[15][16][17][18][19][20][21] With the emerging applications of DNA-targeting drugs in cancer and beyond, the further discovery and characterization of such compounds are of considerable interest. 22 Complexes of transition metal ions, such as platinum(II) and zinc(II) as metal based chemotherapeutic drugs, are of great interest for researchers since they are involved in many biological processes, [23][24][25][26][27][28][29][30][31][32] As outstanding representatives, several platinum-based metallodrugs (cisplatin, carboplatin, and oxaliplatin) have been clinically approved and used for many years for treating advanced cancers. [33][34][35] However, the side effects of platinum drugs, such as dose-limiting toxicity, nonselectivity, and intrinsic or acquired drug resistance, seriously limit their clinical application.…”

Zn(II) and Cd(II) monomer, dimer and polymer compounds coordinated by benzoic acid and 4-acetylpyridine: Synthesis and crystal structures

“…2a). This association is determined by weak C-H⋯π interactions [26,27] (C( 20)⋯Cg(1), 4.251 Å (work); C(4)⋯Cg(1), 5.044 Å [8b]; C(25)⋯Cg(1), 5.026 Å [8d]) between the meta-protons of the syn-anti Bz linkers and the syn-syn aromatic benzoate rings with the concomitant torsion of the synanti Bz rings (Table 1 and Fig. 2b).…”