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2 Polish Journal of Chemistry

2 2005

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Ability of 2,4D and 2,4DP Herbicides to Combine with Metal Ionsof Biological Interst (Part 3): Manganese(II) Complexes

100%

Zwolińska A. , Ptaszyński B. , Wrzeszcz G.

2005

tom Vol. 79 / nr 10

1585-1595

The synthesis and properties of manganese(II) complexes with the commercial auxin herbicides: 2,4-dichlorophenoxyacetic acid (2,4D; C8H6O3Cl2) and 2-(2,4-dichlorophenoxy)- propionic acid (2,4DP; C9H8O3Cl2) are reported. On the basis of the results of elemental analysis and Mn(II) determination, the following molecular formulae were proposed for the obtained compounds: Mn(C8H5O3Cl2)2.2H2O (Mn-2,4D) and Mn(C9H7O3Cl2)2.2H2O (Mn-2,4DP). X-ray powder analysis was carried out. The water solubility of the synthesized complexes at room temperature was determined. The IR spectra, conductivity data (in methanol and dimethylformamide), variable temperature magnetic susceptibility and the way of Mn-herbicide coordination are discussed. Thermal decomposition of these complexes in air was studied by TG, DTG, DTAand TG/MS methods with simultaneous analysis of the solid and gaseous products of pyrolysis.

Ability of 2,4D and 2,4DP Herbicides to Combine with Metal Ions of biological Interest (Part 2): Zine(II) Complexes

100%

Zwolińska A. , Ptaszyński B.

2005

tom Vol. 79 / nr 4

645-654

Zinc(II) complexes with the commercial auxin herbicides 2,4-dichlorophenoxyacetic acid (2,4D; C8H6O3Cl2) and 2-(2,4-dichlorophenoxy)-propionic acid (2,4DP; C9H8O3Cl2) were prepared and characterized. The formulae of the solid complexes Zn2(C8H5O3Cl2)3_5H2O (Zn-2,4D) and Zn(C9H7O3Cl2)2_1.5H2O (Zn-2,4DP) were established on the basis of the results of elemental analysis and Zn(II) determination.Water solubility of synthesized complexes at room temperature was examined. X-ray powder analysis was carried out. The discussion of IR spectra and conductivity data is presented. Thermal decomposition of these complexes in air was studied by TG, DTG, DTA and TG/MS methods with simultaneous analysis of the solid and gaseous products. The formation of complexes Zn-herbicide in the water solution by potentiometric pH titration was also investigated. The dissociation constants (pK) of 2,4D and 2,4DP were determined at 25°C and I = 0.1 (KNO3).