%A %T Synthesis, Structural, Spectroscopic Characterization and Biological Properties of the Zn(Ⅱ), Cu(Ⅱ), Ni(Ⅱ), Co(Ⅱ), and Mn(Ⅱ) Complexes With the Widely Used Herbicide 2,4-Dichlorophenoxyacetic Acid %0 Journal Article %D 2021 %J SPECTROSCOPY AND SPECTRAL ANALYSIS %R 10.3964/j.issn.1000-0593(2021)06-1982-06 %P 1982-1987 %V 41 %N 06 %U {https://www.gpxygpfx.com/CN/abstract/article_12085.shtml} %8 2021-06-01 %X 2,4-Dichlorophenoxyacetic acid (2,4-D) is a board-leaf selective herbicide and globally used in agricultural activities. Complexation mode, spectroscopic investigations and biological properties of complexes formed between 2,4-D (C6H3Cl2OCH2·COOH; HL) with Zn(Ⅱ), Cu(Ⅱ), Ni(Ⅱ), Co(Ⅱ), and Mn(Ⅱ) metal ions were investigated. To characterize the binding mode between 2,4-D and the metal ions, many physicochemical approaches were employed. The complexes obtained are characterized quantitatively and qualitatively by using micro elemental analysis, FTIR spectroscopy, UV-Vis spectroscopy, 1H-NMR, and magnetic susceptibility measurements. Results of these approaches suggested that the gross formula of the complexes obtained with the metal ions were [ZnL2](2H2O (1), [CuL2(H2O)2] (2), [NiL2](3H2O (3), [CoL2(H2O)2] (4), and [MnL2(H2O)2] (5). In all complexes, two L- anion were coordinated the metal ion by their bidentate carboxylate groups. From the spectral study, all the complexes obtained as monomeric structure and the metals center moieties are six-coordinated with octahedral geometry except Ni(Ⅱ) and Zn(Ⅱ) complexes which existed as a tetrahedral and square pyramidal geometry respectively. The complexes were screened in vitro against several microbes (fungi and bacteria) using Kirby-Bauer disc diffusion method, and data has demonstrated that complex 3 showed excellent antifungal activity.