Question

What is the IUPAC name of [Pt(NH₃)₂Cl(NO₂)]?

• A. Diamminechloridonitrito-N-platinum(II)
• B. Diamminechloridenitrito-N-platinum(III)
• C. Diamminechloridonitrito-O-platinum(II)
• D. Diammonia chloridonitrito-N-platinum(II)

Answer 1

The Correct Option is A

To derive the IUPAC name for the coordination compound [Pt(NH₃)₂Cl(NO₂)], adhere to the following nomenclature guidelines:

• Ligand Identification and Order: Ligands are arranged alphabetically in the complex name. Prefixes are disregarded for alphabetization. The ligands present are Ammine (NH₃), Chlorido (Cl), and Nitrito-N (NO₂), where the latter indicates coordination via the nitrogen atom.
• Metal Oxidation State Determination: Platinum (Pt) is the central metal. Ammonia (NH₃) is neutral, chlorido (Cl) carries a -1 charge, and nitrito-N (NO₂) also carries a -1 charge. Given the neutral overall complex charge: Ptⁿ⁺ + (2 × 0) + (-1) + (-1) = 0, solving for n yields +2. Therefore, the metal is platinum(II).
• Complex Naming: Concatenate the ligand names and the metal, including its oxidation state in parentheses. This results in "Diamminechloridonitrito-N-platinum(II)". "Diammine" denotes two ammonia ligands, "chlorido" represents the chloride ligand, and "nitrito-N" specifies the nitrogen coordination.

Consequently, the definitive IUPAC name is: Diamminechloridonitrito-N-platinum(II).