Complex Compounds of Cadmium

Cadmium, like zinc, forms cationic, anionic and neutral complexes which generally resemble the zinc complexes. 

CdBr2 dissolves in KBr solution forming a tetrahedral tetrabromocadmiate(ll) anions which can be precipitated by large cations. 

Prepare a solution of 2.72 g cadmium bromide and dissolve in this solution 2.38 g KBr and heat to dissolve the solids. Prepare a solution 2.42 g copper(lI) nitrate trihydrate to which 1.2 g diaminoethane has been added and heat the solution. Add the hot solution slowly and, with constant stirring, to the hot cadmium complex solution. Allow to cool and filter the dark violet crystals under suction. Wash on the filter with water to remove any unreacted compounds then with small volumes of alcohol and ether. Dry by continued suction while pressing between filter paper. 

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In a first part, experimental methods for studying formation, properties, structures and bonding in complex compounds of cadmium and mercury are briefly surveyed, usually with hints to reviews of the respective field and to examples of recent applications. 

In the main part, dealing with complex compounds of cadmium and mercury, those with complicated organic ligands are not considered, neither are complexes with bio-relevance systematically described. However, it is unavoidable to address the formation of frameworks with the metals and certain organic ligands, and even seemingly simple compounds like Cd(CN)2, especially in the presence of appropriate guest molecules, tend to form wide-pore host frameworks. 

STRUCTURES AND BONDING IN COMPLEX COMPOUNDS OF CADMIUM AND MERCURY... 

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