Consider the structure of the following Ni(II) complex which adopts a distorted octahedral geometry: The formation of this complex shows interactions between: Group of answer choices A borderline acid and hard base ligands A borderline acid and mixed hard/ soft base ligands A soft acid and hard base ligands A soft acid and soft base ligands A borderline acid and borderline base ligands
Question
Consider the structure of the following Ni(II) complex which adopts a distorted octahedral geometry:
The formation of this complex shows interactions between:
Group of answer choices
A borderline acid and hard base ligands
A borderline acid and mixed hard/ soft base ligands
A soft acid and hard base ligands
A soft acid and soft base ligands
A borderline acid and borderline base ligands
Solution
To answer this question, we need to understand the concepts of hard and soft acids and bases (HSAB theory).
Ni(II) is a transition metal and is considered a borderline acid.
The ligands in the complex are water molecules and ammonia. Water and ammonia are both considered as hard base ligands because they are small, have high charge densities, and prefer to form ionic bonds.
Therefore, the interaction in the formation of this Ni(II) complex is between a borderline acid and hard base ligands. So, the correct answer is "A borderline acid and hard base ligands".
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