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Why would the complex Na2[Co(SCN)4] display bright colour
Accepted Answer
The complex Na2[Co(SCN)4] displays a bright color due to the d-d electronic transitions within the cobalt(II) ion. In this complex, cobalt(II) has a d7 electronic configuration and a tetrahedral geometry. The SCN- ligands are weak-field ligands, leading to a smaller splitting of the d-orbitals. When light is absorbed, an electron in a lower energy d-orbital is excited to a higher energy d-orbital, resulting in the complex absorbing certain wavelengths and reflecting others, thus giving it a vibrant color.
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