engleski

Synthesis, characterization and thermal decomposition of the pyridine adducts od Co, Ni, Cu and Zn sulfate

Pyridine adducts of Co, Ni, Cu and Zn sulfate were obtained by refluxing the corresponding sulfate with pyridine in chloroform. The compounds were characterized by elemental analysis, x-ray powder diffraction and FTIR spectroscopy. The elemental and thermal analysis results revealed that the formulae of the complexes are M2(SO4)2xC5H5NyH2O where x=2, 3, 2, and 1 and y=6, 4, 6 and 4 for the Co, Ni, Cu and Zn compound, respectively. The complexes were not found to be isostructural, but certain structural similarities were observed between Zn and Co compounds. Although the thermal decomposition pathways of the various compounds were quite different and each consisted of several steps, in all cases the dehydration preceded the depyridination. The spectral data are discussed with regard to the thermal behaviour. Appreciably strong hydrogen bonding and pronounced structural differences relating the sulfate ions were presumed for the Cu compound.

M(II) sulfates ; pyridine adducts ; thermal composition

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