The title compound was studied. Its solubility in water at 293 K was determined (4 Á 10 À4 mol Á dm À3 ). The IR spectrum of the prepared complex was recorded, and its thermal decomposition in air was investigated. The trihydrated complex starts to lose its crystallization water at 343 K; it then decomposes either to CuO (5 K min heating rate) or to gaseous products (10 K min heating rate). [Cu(C 7 H 3 Cl 2 O 2 ) 2 Á (H 2 O) 3 ] crystallizes in the monoclinic system (space group P2 1 n (No. 14)); cell parameters: a 16.854(3) A Ê , b 8.330(2) A Ê , c 13.655(3) A Ê , 104.20(3) , V 1858(5) A Ê 3 , Z 4, D C 1.778 g/cm 3 , D m 1.78 g/cm 3 .
The conditions and products of thermal decomposition ofcopper(II) benzenedicarboxylates in air atmosphere were studied at heating rates of 10 and 5 deg. min-1. At a heating rate of 10 deg-min-1, the o-and p-phthalate of copper(l I) lose the crystallization water in two steps and the anhydrous complexes then decompose directly to CuO. Copper(ll) m-phthalate loses crystallization water in one step to give the dihydrate, which then decomposes directly to CuO. When heated at 5 dog. min -1, the m-and p-phthalates ofcopper(ll) decompose in the same way, whereas the anhydrous o-phthalate decomposes to CuO through Cu20.
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