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The complex [NiCl2(P(C2H5)2(C6H5))2] shows magnetic behavior that changes with temperature, being paramagnetic at one temperature range and diamagnetic at another. The coordination geometries around Ni2+ in the paramagnetic and diamagnetic forms, respectively, are:

1. tetrahedral and tetrahedral
2. square planar and square planar
3. tetrahedral and square planar
4. square planar and tetrahedral

Correct answer: tetrahedral and square planar

Solution

[NiCl2(PEt2Ph)2] shows a tetrahedral <-> square planar equilibrium. The tetrahedral form has two unpaired electrons (paramagnetic), while the square planar form is spin-paired (diamagnetic).

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