In this study, four new mixed-ligand saccharin complexes with 2-[[(2-Aminophenyl)imino]methyl]-6-methoxy phenol Schiff base and metal saccharinates (nickel, copper, zinc and cadmium) have been prepared and characterized with various methods including elemental analysis, FT-IR spectroscopy, UV-visible absorption spectroscopy, NMR spectroscopy, QTOF-LC/MS spectroscopy. All methods have confirmed the inclusion of the Schiff base obtained by condensation of o-phenylendiamine and o-vanillin into the metal saccharinates. Besides, DPPH scavenging activities and metal chelating abilities of all complexes have been determined and compared to well-known antioxidant standards (Butylated hydroxyanisole, Butylated hydroxytoluene and α-Tocopherol) along with starting metal saccharinates. According to the results, nickel complex has exhibited the best DPPH scavenging activity, while copper complex has the highest ferrous ion chelating ability.

中文翻译：

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具有邻苯二胺席夫碱的新型混合配体糖精复合物和抗氧化剂的研究

在这项研究中，制备了四个新的具有2-[[[（（2-氨基苯基）亚氨基]甲基] -6-甲氧基苯酚席夫碱和金属糖精（镍，铜，锌和镉）的混合配体糖精配合物，并进行了表征。各种方法，包括元素分析，FT-IR光谱，UV-可见吸收光谱，NMR光谱，QTOF-LC / MS光谱。所有方法都证实了将邻苯二胺和邻香兰素缩合到糖精金属中获得的席夫碱。此外，已测定了所有配合物的DPPH清除活性和金属螯合能力，并将其与众所周知的抗氧化剂标准品（丁基化羟基茴香醚，丁基化羟基甲苯和α-生育酚）以及起始金属糖精进行了比较。根据结果​​，