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Which would have the least intense peaks in the uv- vis spectrum [ti(h20)6]2+, [v(h20)6]2+,[mn(h20)6]2+ and [ni(h20)6]2+
Accepted Answer
[Ti(H2O)6]2+ would have the least intense peaks in the UV-Vis spectrum. Here's why:
d-orbital configuration: The intensity of UV-Vis absorption bands is related to the number of d electrons and the allowed electronic transitions.
Ti(II) vs. others: Titanium(II) has a d2 configuration, while V(II) has d3, Mn(II) has d5, and Ni(II) has d8.
d-d transitions: The d-d transitions responsible for UV-Vis absorption are typically weak (Laporte forbidden). Ti(II) has fewer d electrons, so it has fewer possible d-d transitions, leading to weaker absorption bands.
Ligand field splitting: The octahedral ligand field of water ligands will split the d orbitals into two energy levels (eg and t2g). The energy difference between these levels dictates the wavelength of absorbed light. While this factor can influence the exact wavelengths, it doesn't explain the overall weaker intensity observed for Ti(II) due to its limited number of d electrons.
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