Color of transition metal ions and complexes
Color of transition metal ions and complexes
Formula
ΔE = hν = hc/λ
Real World
Ruby gemstones get their deep red colour from Cr³⁺ ions in an aluminium oxide lattice — the crystal field splitting absorbs green-blue light, transmitting only red wavelengths to your eye.
Exam Focus
Always state which colour is absorbed AND which is observed — they are complementary, and examiners award separate marks for each.
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