Name the following complex. Make certain your answer identifies the correct structural or geometric isomer (do not worry about optical isomerism for this question)?

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1 Answer
Dec 27, 2016

The name of the ion is cis-tetraamminedicyanocobalt(III).


The ligands are named "ammine" and "cyano".

The two cyano groups are at 90° to each other, so they are cis.

If they had been at 180° from each other the ion would have been *trans.

The cyanide ions originally had a charge of -1, and the complex ion has a charge of +1, so the oxidation number of the cobalt atom must be +3.