Synthesis of Cyanoguanidine-Metal ComplexesCyanoguanidine Complexes of SnCl 2 , Ni(NO 3 ) 2 , Co(NO 3 ) 2 , ZnCl 2 , and Cu(NO 3 ) 2 , were prepared according to the following method [7]:A solution of 1 mol of metal salt in ethanol was added to 2 mol of cyanoguanidine in ethanol, and the mixture was heated under reflux until precipitation of the complex occurred. The precipitate was then washed with hot etha-
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