Chemistry · IUPAC nomenclature of mononuclear co-ordination compounds, isomerism

The IUPAC name of _{4}\right]\left[\mathrm{NiCl}_{4}\right] \) is :

The IUPAC name of \( \left[\mathrm{Ni}\left(\mathrm{NH}_{3}\right)_{4}\right]\left[\mathrm{NiCl}_{4}\right] \) is :

  • A. tetrachloronickel (II)-tetraaminenickel (II)
  • B. tetramminenickel (II)-tetrachloronickel (II)
  • C. tetraamminenickel (II)-tetrachloronickelate (II)
  • D. tetrachloronickel (II)-tetraaminenickelate (0)

Step-by-step solution

The compound [Ni(NH3)4][NiCl4] consists of complex cation [Ni(NH3)4]²⁺ and complex anion [NiCl4]²⁻. According to IUPAC nomenclature, the cation is named first as tetraamminenickel(II) (NH3 = ammine, Ni oxidation state +2), and the anion is named with the -ate suffix as tetrachloronickelate(II). Thus the correct name is tetraamminenickel(II) tetrachloronickelate(II). Options A and B incorrectly order the ions or omit the -ate suffix; option D has wrong oxidation states.
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