Question

IUPAC name of complex compound [Pt(Br)₂(PPh₃)₂].

• A. Dibromido di(triphenyl phosphine) platinum(II)
• B. Dibromido bis(triphenyl phosphine) platinum(II)
• C. bis(triphenyl phosphine) dibromide platinum(II)
• D. bis(triphenyl phosphine) dibromide platinate(II)

Answer 1

The Correct Option is B

To determine the IUPAC name of the complex compound \([Pt(Br)_2(PPh_3)_2]\), we need to follow the nomenclature rules for coordination complexes. Let's break down the naming process step-by-step:

1. Identify the ligands and the metal in the complex. In this case, we have:
   • Bromide ligands: Br₂
   • Triphenylphosphine ligands: PPh₃
   • Central metal: Platinum (Pt)
2. Name the ligands:
   • The bromide ions are named as "bromido" when they act as ligands. Since there are two bromide ions, it is named as "dibromido."
   • Triphenylphosphine is a common ligand and is named as "triphenyl phosphine." Since there are two PPh₃ ligands, the prefix "bis" is used, making it "bis(triphenyl phosphine)."
3. Name the metal and its oxidation state:
   • The central metal is Platinum. In this context, the oxidation state is determined as +2, hence indicated by (II).
4. Combine these to form the full IUPAC name:
   • The full name is constructed by listing the ligands in alphabetical order, followed by the metal with its oxidation state.
   • Thus, the correct IUPAC name is "Dibromido bis(triphenyl phosphine) platinum(II)."
5. Explanation of options:
   • "Dibromido di(triphenyl phosphine) platinum(II)" is incorrect because "di" is not the proper prefix for two ligands when naming compounds with a ligand that already contains a numerical prefix. The correct prefix is "bis."
   • "bis(triphenyl phosphine) dibromide platinum(II)" incorrectly reverses the usual order of naming ligands before the metal and uses "dibromide" instead of "dibromido."
   • "bis(triphenyl phosphine) dibromide platinate(II)" uses "platinate" instead of "platinum" which is incorrect in this context.

Therefore, the correct IUPAC name is "Dibromido bis(triphenyl phosphine) platinum(II)."