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.