Visualizing d-d Transitions and the Complementary Color Wheel.
1. Select Complex (Titanium III)
Change Ligand (Spectrochemical Series)
Absorbed Wavelength500 nm(Green)
Observed ColorViolet-Red
Color
2. d-d Transition (Δₒ Energy)
↑
⚡
Δₒ
3. Chemical Principles
d-d Transition: Transition metal ions have degenerate d-orbitals that split into two energy levels (t₂g and eₐ) in a ligand field.
Absorption: When white light passes through, an electron in the lower t₂g level absorbs a photon with energy exactly equal to the gap (E = hc/λ = Δₒ) and jumps to the higher eₐ level.
Complementary Color: The absorbed wavelength is subtracted from the white light. The light that is transmitted (or reflected) is a mixture of the remaining wavelengths, which our eyes perceive as the complementary color on the color wheel.
Left Click + Drag to Rotate • The background light represents transmitted color
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