Question

IUPAC name of complex ${{K}_{3}}[Al{{({{C}_{2}}O{}_{4})}_{3}}]$ is:
A. Potassium alumino-oxalate.
B. Potassium trioxalatoaluminate (III).
C. Potassium aluminum (III) oxalate.
D. Potassium trioxalatoaluminate (IV).

Answer 1

Hint: IUPAC means International Union of Pure and Applied Chemistry. It explains how to write the name for the metallic complexes or coordination complexes.

Complete step by step answer:
-There are some rules for naming of the coordination compounds according to IUPAC.
-The ligands should name first and then the metal.
-The charge of metal should be written in Roman numerals and enclosed in the parenthesis after metal name.
-If the coordination complex has more than one ligand then the ligands are named in alphabetical order before the metal ion.
-If more than two types of ligands are present then include a numerical prefix in the name use the prefixes bis for 2, tris for 3, or tetrakis for 4 to indicate their number.
-If the coordination complex ion is an anion, we have to write “ate” at the ending of the metal name.
-The given complex is,${{K}_{3}}[Al{{({{C}_{2}}O{}_{4})}_{3}}]$
-In the given coordination compound, aluminum is the metal ($Al$), and ${{C}_{2}}{{O}_{4}}$ is the oxalate ligand named as oxalato.
-The complex is going to lose three potassium ions when it dissolves in water then the charge on is -3 and oxalate is having an oxidation state of -2.
-Hence, the IUPAC name of ${{K}_{3}}[Al{{({{C}_{2}}O{}_{4})}_{3}}]$ is Potassium trioxalatoaluminate (III).
-So, the correct option is B.

Note: Don’t be confused with the words bis, tris, tetrakis and bi, tri, tetra.
If the complex has two different ligands, one ligand should be mentioned as bis, tris or tetrakis depending on how many one type of ligands are present.
The other ligand should be mentioned as bi, tri, tetra depending on the number of ligands of the same type present.