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Most d10 bis(phenanthroline)copper(I) complexes, [Cu(phen)2]* adopt D2a pseudo-tetrahedral geometry. When photo- oxidized to [Cu(phen)2]2 the complex undergoes a Jahn-Teller type distortion to a flattened D2 geometry, approaching square planar. Please use the splitting diagram and the coordinate systems below to answer the following questions using crystal field theory considerations: Z Z View along x-axis Z View along x-axi is Z Z il N x N Cu: x Cu N- x N N N: II y y y y y Tetrahedral Pseudo-tetrahedral (D2d) Flattened (D2) dxy dxz dyz dxz dxy dx²-y² Barycenter dx².y² dyz d2² d2² a. Why does [Cu(phen)2]2+ undergo a Jahn-Teller distortion upon photo-oxidation? / b. Why are the dxy and dx-y orbitals the most destabilized by the flattening distortion? Why is the dxy orbital more destabilized than the orbital during flattening? c. Why is the energy of the d2² orbital essentially unaffected by the flattening distortion?

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