Homoleptic complex from the following complexes is:
Diamminechloridonitrito-N-platinum (II)
Pentaamminecarbonatocobalt (III) chloride
Triamminetriaquachromium (III) chloride
Potassium trioxalatoaluminate (III)
The Correct Option is D
Approach Solution - 1
Let's analyze each complex to identify the homoleptic complex:
(A) Diamminechloridonitrito-N-platinum (II): This complex contains three different ligands - diammine (NH3), chlorido (Cl-), and nitrito-N (NO2-). It is not a homoleptic complex because it has multiple types of ligands.
(B) Pentaamminecarbonatocobalt (III) chloride: This complex contains two different ligands - pentaammine (NH3) and carbonato (CO32-). It is not a homoleptic complex because it has multiple types of ligands.
(C) Triamminetriaquachromium (III) chloride: This complex contains two different ligands - triammine (NH3) and triaqua (H2O). It is not a homoleptic complex because it has multiple types of ligands.
(D) Potassium trioxalatoaluminate (III): This complex contains only one type of ligand - trioxalato (C2O42-). It is a homoleptic complex because all the ligands surrounding the central metal ion (aluminum in this case) are of the same type.
Therefore, the correct answer is (D): Potassium trioxalatoaluminate (III).
Approach Solution -2
The hololeptic complex refers to a complex where all the ligands are identical.
Among the options provided:
- Diamminechloridonitrito-N-platinum (II) contains three different ligands: ammine (NH3), chlorido (Cl), and nitrito-N (NO2), so it's not hololeptic.
- Pentaamminecarbonatocobalt (III) chloride has two different ligands: ammine (NH3) and carbonato (CO3), so it's not hololeptic.
- Triamminetriaquachromium (III) chloride contains three ligands: ammine (NH3), aqua (H2O), and chlorido (Cl), so it's not hololeptic.
- Potassium trioxalatoaluminate (III) contains one type of ligand: trioxalato (C2O4), so it is a hololeptic complex.
So, the correct option is (D): Potassium trioxalatoaluminate (III)
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Concepts Used:
Coordination Compounds
A coordination compound holds a central metal atom or ion surrounded by various oppositely charged ions or neutral molecules. These molecules or ions are re-bonded to the metal atom or ion by a coordinate bond.
Coordination entity:
A coordination entity composes of a central metal atom or ion bonded to a fixed number of ions or molecules.
Ligands:
A molecule, ion, or group which is bonded to the metal atom or ion in a complex or coordination compound by a coordinate bond is commonly called a ligand. It may be either neutral, positively, or negatively charged.