Question

Write the IUPAC name of the complex; $\left[ Ag{{\left( N{{H}_{3}} \right)}_{2}} \right]\left[ Ag{{\left( CN \right)}_{2}} \right]$

Answer 1

Hint: The IUPAC name for the complex compounds has a specific pattern and contains the word root of all the elements comprising the complex compound. Firstly, identify the cationic and anionic part to start naming.

Complete answer:
Let us first understand about the coordination complex and the procedure to name any complex before we move towards the given data.
Coordination complex –
Coordination compounds are any class of substances with chemical structures which have a central metal atom surrounded by ligands (nonmetal atoms or groups of atoms) joined by chemical bonds.
The central atom is called the coordination centre.
Ligands or complexing agents is an array of bound molecules or ions.
Coordination complexes are mostly metal containing compounds, those are transition metals.
The basic procedure for naming a complex is as follows;
1. While naming a complex ion, the ligands are named prior to the metal ion.
2. The ligands’ names are given in alphabetical order. Numerical prefixes do not affect the order.
- Monodentate ligands receive di-, tri-, tetra-, penta-, or hexa- as prefix according to their number of occurrences.
- Multiple occurring polydentate ligands receive bis-, tris-, tetrakis-, etc.
- Anions end in o. this replaces the final ‘e’ when the anion ends with ‘-ide’, ‘-ate’ or ‘-ite’, example- chlorine becomes chlorido and sulphate becomes suphato.
- Neutral ligands are given their common name, with some exceptions: $N{{H}_{3}}$becomes amine, ${{H}_{2}}O$ becomes aqua or aquo, CO becomes carbonyl, NO becomes nitrosyl.
3. Write the name of the central atom/ion. The central atom’s name will end in ‘-ate’, if the central atom is an anion. Except for mercury, other atoms will get their respective Latin name.
4. The oxidation state of the central atom is to be specified enclosed in parentheses. Those should be in roman numerals.
5. Name of the cation should be preceded by the name of anion.
Illustration-
According to the above written rules,
The IUPAC name of the given compound i.e. $\left[ Ag{{\left( N{{H}_{3}} \right)}_{2}} \right]\left[ Ag{{\left( CN \right)}_{2}} \right]$ is Di ammine silver (I) dicyanoargentate (I).
Here, the metal is named differently i.e. silver for cation and argentate for anion.

Note:
Do note that there is a change in the Latin names of the central metal atom when it becomes a part of anion complex. Here, silver changed to argentate.