A d-d transition refers to an electronic transition that occurs between two energy levels of electrons in the d orbitals of transition metal ions. In these transitions, an electron is excited from one d orbital to another d orbital within the same ion.
Transition metal ions have partially filled d orbitals, which give rise to their characteristic colors in compounds or solutions. When light interacts with these ions, it can be absorbed or emitted as a result of electronic transitions between different energy levels of the d orbitals.
The energy of the absorbed or emitted light corresponds to the energy difference between the initial and final d orbital states involved in the transition. This energy difference is determined by various factors, such as the nature of the transition metal ion, its oxidation state, and the ligands surrounding the ion in a complex.
Overall, d-d transitions are important in understanding the optical properties and colors exhibited by transition metal complexes, and they play a significant role in fields such as spectroscopy and coordination chemistry.
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