Coordination Chemistry & Crystal Field Theory

Transition metals rarely exist alone — they sit at the centre of a coordination complex, surrounded by ligands that donate electron pairs and split the metal's d-orbitals into distinct energy levels. This simulation lets you build a complex from scratch: choose its geometry, pick a ligand from the spectrochemical series, and set the metal's d-electron count. Watch the crystal-field splitting diagram fill in real time, see whether the configuration settles into a high-spin or low-spin arrangement, and observe how the complex's illustrative colour shifts with the size of the splitting energy Δ₀.