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Choose the coordination complex from below that would present with the least intense peaks in the UV-VIS spectrum: [ti(h2o)6]2+ [v(h2o)6]2+ [mn(h2o)6]2+ [ni(h2o)6]2+

Accepted Answer

The coordination complex [Mn(H2O)6]2+ would exhibit the least intense peaks in the UV-Vis spectrum. This is because Mn(II) has a d5 electronic configuration, making it a high-spin complex with no d-d transitions in the visible region. The other complexes ([Ti(H2O)6]2+, [V(H2O)6]2+, and [Ni(H2O)6]2+) possess d-electrons that can undergo d-d transitions, leading to absorption in the visible region and consequently, more intense peaks in the UV-Vis spectrum.


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