Question

What is the IUPAC name of $[Ag{(N{H_3})_2}][Ag{(CN)_2}]$ ?

Answer 1

Coordination complexes is a type of compound in which the central metal atom is surrounded by ligands through coordinate bonds. IUPAC stands for International Union of Pure and Applied Chemistry. IUPAC has set some rules for naming the coordination compounds which needs to be strictly followed.

Complete answer:
So, the process by which naming of compounds is done is known as IUPAC nomenclature.
Now, the IUPAC rules by which naming a coordination compound are:-
(1) While naming the complexes, ligands are named before the central metal ion/atom.
(2) Name of the ligands are written in order: neutral, anion. If there is more than one ligand of the same charge type then, the naming is done in alphabetical order. (Also we should remember that numerical prefixes do not affect the order).
(3) If a monodentate ligand is present multiple times then prefix according to the number of occurrences: di-, tri-, tetra-, penta-, or hexa is written and if polydentate ligands (oxalate,etc.) then prefix bis-, tris-, tetrakis-, etc. is written.
(4) For the anionic ligand, naming is done by replacing ‘e’ with ‘ido’ when anion ends with ‘-ate’ and replacing ‘-ide’ by ‘-ido’ when anion ends with ‘-ide’.
(5) Neural ligands have their usual names except some exceptions such as: $N{H_3}$ is named as “ammine”, ${H_2}O$ is named as “aqua”, CO is named as “carbonyl” and NO is named as “nitrosyl”.
(6) Now, for the central metal atom/ ion. If the complex is anion, then it’s name will end with ‘-ate’ otherwise the name will remain the same.
(7) Central atom’s oxidation state should be specified. It should be written as a Roman numeral in parentheses.

Therefore, based on the above rules the IUPAC name of given complex: $[Ag{(N{H_3})_2}][Ag{(CN)_2}]$ is diamminesilver(I) dicyanoargentate(I).

Note:
The oxidation state should be written as a Roman numeral in parentheses only next to the metal atom/ ion without any space in between. For a cationic complex, the name of metal atom/ion remains as usual while in case of anionic complex, the name of metal atom/ion should end with the suffix ‘-ate’.