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

Zwolińska A., Ptaszyński B.

Polish Journal of Chemistry

2005

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).

Syntheses and Crystal Structures of Zinc(II) Complexes with Two Kinds of Benzoate Derivatives

Zhao Q., Li H.-F., Ma Y. -P., Fang R. -B.

Polish Journal of Chemistry

2002

Vol. 76 / nr 4

497-502

Two novel zinc(II) complexes of [Zn(L1)2(phen)]_5H2O 1 (L1 = 4-aminobenzoic acid, phen = 1,10-phenanthroline) and [Zn(L2)2(en)] 2 (L2 = 4-methoxybenzoic acid, en = ethylenediamine) have been prepared and characterized by X-ray single crystal structural analysis. Complex 1 crystallizes in the tetragonal system, space group I41/a. The zinc atom of the central ZnO3N2 system is pentahedral coordinated by two N atoms of phen and three O atoms of 4-aminobenzoic acid. Complex 2 belongs to orthorhombic system, space group Pbcn. The zinc atom of the central ZnO2N2 system lies on a twofold symmetry axis and is tetrahedrally coordinated by two N atoms of en and two O atoms of 4-methoxybenzoic acid.