Question

IUPAC name of $[Co{{(N{{H}_{3}})}_{5}}N{{O}_{2}}]Cl$

Answer 1

Hint: To determine the IUPAC name at first we have to determine the oxidation state of the central metal atom that is $Co$ . This complex is a cationic complex as chlorine atoms are present outside the coordination sphere.

Complete Step by Step Solution:
The given compound is $[Co{{(N{{H}_{3}})}_{5}}N{{O}_{2}}]Cl$.
The given compound is diammine silver (I) chloride.
We know that an amine group is a neutral group so it does not contribute any charge. Again this complex has five amine groups so, the naming for amine is pentaammine.
The nitro group has a $-2$ charge and the term for the nitro group is nitro-N as the nitrogen atom is attached to the central metal atom.
The symbol of chloride ligand is $Cl$ .

Let the oxidation state of $Co$ is $x$ .
Again chloride is a negative ligand so, the charge of chloride ligand is $-1$ .
The charge due to amine is zero.
Thus we can write as follows:
$x+0\times 5+(-2)-1=0 \\ $
$ x-3=0 \\ $
$ x=+3 \\ $
So, the value of $x$ by solving the above equation is $+3$ .
So, the oxidation state of the central metal atom cobalt is also $+3$ .
Thus the IUPAC name of the given complex is $[Co{{(N{{H}_{3}})}_{5}}N{{O}_{2}}]Cl$ is pentaammine nitro-Cobalt (III) chloride.

Additional information: Cobalt is a transition element. In the $+3$ oxidation state the metal $d$ orbital has $6$ electrons and acts as an oxidising agent.

Note: Nitro group can coordinate to the central metal atom by both nitrogen and oxygen atom. Thus the nitro group acts as an ambidentate ligand.