Question

The IUPAC name of $\left[Fe{\left(H_{2}O\right)}_5\left(NO\right)\right]S{O}_4$ is penta aquanitrosylium iron ( I ) sulphate.

• A. True
• B. False

Answer 1

The correct option is A True

Rules for naming the coordination compound:-

(1) Ligands are named before the metal.

(2) Names of ligands are written in order of neutral, negative, positive. If there are multiple ligands of the same charge type, they are named in alphabetical order.

(3) Monodental ligand prefix: di, tri,tetra...etc. Polydentate ligands receive prefix: bis, tris, tetrakis...etc.

(4) Anions end in $-ido$. This replaces the final 'e' when the anion ends with 'ate' and replaces 'ide'.

(5) Write name of central atom/ion. If complex is anion, central atom's name eneds with '-ate'.

(6) If central atom's oxidation state needs to be specified, write it as a roman numeral in parenthesis.

The IUPAC name of $\left[Fe\right(H_{2}O{)}_5\left(NO\right)]S{O}_4$ is penta aquanitrosylium iron $\left(I\right)$ sulphate.

Here, the penta aqua represent the $5$ atoms of $H_{2}O$ as ligand Nitrosyl is $NO$ as ligand. Iron is the central metal atom and $S{O}_4$ (sulphate) is the counter ion. Also, the oxidation state of Iron in this complex is $+1$ which is represented in parenthesis in IUPAC name.