Question

Which of the following rules is not correct regarding IUPAC nomenclature of complex ions?

• A. Cation is named first and then anion.
• B. In coordination sphere, the ligands are named alphabetically.
• C. Positively charged ligands have suffix 'ate'.
• D. More than one ligand of a particular type are indicated by using di, tri, tetra, etc.

Answer 1

The correct option is C Positively charged ligands have suffix 'ate'.

Negatively charged ligands have suffix 'ate'. For example sulphate $\left(S{O}_4^{2-}\right)$, acetate $\left(C{H}_{3}CO{O}^{-}\right)$, carbonate $\left(C{O}_3^{2-}\right)$, nitrate $\left(N{O}_3^{-}\right)$, hydroxide $\left(O{H}^{-}\right)$ and cyanide $\left(C{N}^{-}\right)$ etc.

Some examples of positively charged ligands are nitrosylium $\left(N{O}^{+}\right)$, hydrazinium $\left(N_2{H}_5^{+}\right)$ etc.