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3 Polish Journal of Chemistry

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Preparation, Structure and Thermal Decomposition of Zinc(II) Complex with 2,5-Dichlorobenzoic Acid

Wołodkiewicz W., Głowiak T.

Polish Journal of Chemistry

2001

Vol. 75, nr 2

299-306

Spectral and thermal studies of Co(II), Ni(II), Cu(II), Zn(II) and Cd(II) complexes with 2,3-dichlorobenzoic acid

Wołodkiewicz W., Brzyska W.

Polish Journal of Chemistry

1998

Vol. 72, nr 11

2366-2370

The title compounds were prepared and their solubility in water at 295 K (10(-2) -10(-1) mol/dm sześc.) the IR spectra and X-ray diffractograms complexes were recorded, and their thermal decomposition in air was investigated. During heating the hydrated complexes (Co, Ni, Cd) lose crystalization water molecules in one step and the anhydrous compounds decompose to oxides (Co, Ni, Zn: 5 and 10 K/min and Cu: 5 K/min heating rate) or to gaseouns products (Cu: 10 K/min, Cd: 5 and 10 K/min heating rate).

Crystal structure of Co(II) and Ni(II) isomorphous complexes with 3,4-dichlorobenzoic acid

Wołodkiewicz W., Głowiak T.

Polish Journal of Chemistry

1998

Vol. 72, nr 7

1249-1254

The compounds have the formula [M(C7H3O2Cl2)2x4H2O], were M=Co(II), Ni(II) and their crystals are isomorphous in the monoclinic space group P2(1)/c with a=10.151(3) A, b=6.221(2) A, c=29.636(6) A and beta=93.51(3)degree for the Co(II) complex and a=10.063(3) A, b=6.200(2) A, c=29.820(6) A and beta=93.40(3)degree for the Ni(II) complex. The structure were solved by the heavy-atom method and refined to the final R=0.0293, wR=0.075 for 3150 observed reflections for the Co(II) complex and R=0.0487 and wR=0.116 for 2545 observed reflections for the Ni(II) complex. The metal(II) ion is coordinated by two oxygen atoms of two monodentate czrboxylate groups of 3,4-dichlorobenzoate anions and four oxygen atoms from water molecules. The M-O distances range from 2.050(2) A to 2.148(2) A for the Co(II) complex and from 2.039(3) A to 2.111(3) A for the Ni(II) complex.