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Complexes of dicamba with cadmium(II), copper(II), mercury(II), lead(II) and zinc(II)

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Abstract

New solid complexes of a herbicide known as dicamba (3,6-dichloro-2-methoxybenzoic acid) with Pb(II), Cd(II), Cu(II) and Hg(II) of the general formula M(dicamba)2·xH2O (M=metal, x=0-2) and Zn2(OH)(dicamba)3·2H2O have been prepared and studied. The complexes have different crystal structures. The carboxylate groups in the lead, cadmium and copper complexes are bidentate, chelating, symmetrical, in Hg(dicamba)2·2H2O - unidentate, and in the zinc salt - bidentate, bridging, symmetrical. The anhydrous compounds decompose in three stages, except for the lead salt whose decomposition proceeds in four stages. The main gaseous decomposition products are CO2, CH3OH, HCl and H2O. Trace amounts of compounds containing an aromatic ring were also detected. The final solid decomposition products are oxychlorides of metals and CuO.

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Turek, A., Kobyłecka, J. & Ptaszyński, B. Complexes of dicamba with cadmium(II), copper(II), mercury(II), lead(II) and zinc(II). Journal of Thermal Analysis and Calorimetry 78, 513–524 (2004). https://doi.org/10.1023/B:JTAN.0000046115.64116.95

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  • DOI: https://doi.org/10.1023/B:JTAN.0000046115.64116.95

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