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Introduction. Trivalent metal cations (most often A13+ and Cr 3+) form not only a variety of double sulfates with univalent alkaline and ammonium cations, but also with univalent guanidinium and

Double sulfates of cobalt(II), nickel(II), copper(II) and zinc with the monomethylammonium cation were obtained from the reaction mixture of the corresponding metal sulfate and monomethylammonium sulfate in a molar ratio of 1:3.The obtained compounds were studied by the methods of X-ray powder diffraction, TG and DSC analysis and elemental analysis.It was found that the double sulfates have the formula (CH3NH3)2M(SO4)2.6H20, and that the cobalt, nickel and zinc compounds are isostructural. The relationship between crystal structure and thermal decomposition is discussed.

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