The Preparation And Application Of Rare Earth Diphenyl Carboxylic Acid Bacteriostatic Agent

In recent years, the diseases and pests of plant appeared different degree drug resistance for common bactericides in agriculture, the effect of prevention and cure is obviously fall. So it is very essential to synthesis the new type high efficiency, low toxicity bacteriostatic agent in order to prevent and control of plant diseases and pests.Based on the antibacterial activity of rare earth and two benzene carboxylic acid ligand. The seven complexes were prepared by hydrothermal and solution reactions. The complexes 1,2 possess chemcial structure [Dy2(SDBA)3(H2O)3(DMF)2] and [Tm2(SDBA)3(H2O)5], which were characterized by X-ray single crystal diffraction.The results show that H2SDBA has four coordination modes in complexes: single(chelating bidentate), bis(chelating bidentate), bis (bridging bidentate), tridentate. The complexes 1-7 were also characterized by infrared spectra, UV spectra, element analysis, molar conductivity methods, thermogravimetric analysis. We inferred that the complexes 3-7 possess chemcial structure [RE2(SDBA)3(H2O)5], (RE=Pr3+, Sm3+, Eu3+, Tb3+, Er3+), the complexes 2-7 are isostructural.The calorimetry are used to monistor the bacteriostasis of the complexes which we have synthesised. All of the complexes have better antibacterial relatively. Take complex 1 for example, we add the pesticide emulsifier 700, the sodium ligninsulfonate, the sodium dodecyl sulfate, the organosilicon additives to form based formula of the bacteriostatic agent. Then, we test the growth curve of add formula gambogic micrococcus. The results demonstrated that the bacteriostatic effect is better. It will provide hermodynamics basis and theoretical basis for these complexes, and can afford a new thought for functional complexes pesticide research.