Question

Which of the following is the correct formulation of the entity according to IUPAC ?

• A. $\left(Co\right(CN{)}_6{)}^{3-}$
• B. $\left[Co\right(CN{)}_6{]}^{3-}$
• C. $\left[Co\right(CN{)}_6^{3-}]$
• D. None of the above

Answer 1

The correct option is B $\left[Co\right(CN{)}_6{]}^{3-}$

The formula of the coordination entity should be en closed within square brackets and there should be no space between the ligand and central metal. the number is written before the sign while indication the charge of the complex ion.