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What coordination complex from this list would present the least intense peaks in the UV-Vis spectrum? [ti(h2o)6]2+ or [v(h2o)6]2+ or [mn(h2o)6]2+ or [ni(h2o)6]2+
Accepted Answer
[Mn(H2O)6]2+ would present the least intense peaks in the UV-Vis spectrum. This is because Mn2+ has a d5 electronic configuration, which means all its d orbitals are half-filled. Transitions between these half-filled d orbitals require a relatively high energy, placing the absorption bands in the UV region, outside the visible range. The other complexes have partially filled d orbitals, leading to lower energy d-d transitions within the visible region, resulting in colored solutions.
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