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The structures of \( \left[N i(C O)_{4}\right] \) and \( \left[N i\left(\left(P h_{3}\right)_{3} P\right)_{2} C l_{2}\right] \) are:

1. square planar in both cases
2. tetrahedral and square planar respectively
3. tetrahedral in both cases
4. square planar and tetrahedral respectively

Correct answer: tetrahedral and square planar respectively

Solution

In [Ni(CO)4], nickel is in the zero oxidation state and is 4-coordinate, which commonly gives a tetrahedral geometry for d10 metal carbonyls. In [Ni((Ph3)3P)2Cl2], nickel is Ni(II) (d8), and strong-field phosphine ligands favor a square planar arrangement.

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