# Which ligand names have to be parenthesized while naming the Mononuclear Coordination entities

While studying about the Nomenclature of Coordination Compounds I came to know that

While writing formulae of Mononuclear Coordination entities polyatomic ligands are enclosed in parenthesis and also their abbreviations.

But while naming the entities should I follow the same rule?

Like for $$\ce{[Ni(H2O)2(en)2]SO4}$$ should it be named as

Di(aqua)bis(ethylene-1,2-diamine)nickel(II) suphate

Or

Diaquabis(ethylene-1,2-diamine)nickel(II) sulphate

I Mean is there any rule that says you only need to close certain species of ligands like specifically bidentate (such as en) and polydented ligands (such as EDTA) and can keep the others as they are?

Thanks.

• If you ask which ligand names have to be parenthesized then simply ask that. Right now the title is meaningless. – Mithoron Dec 27 '20 at 19:31
• Thanks for the help @Mithoron I'm really confused about only the polyatomic ligands. – S RM Dec 27 '20 at 21:31