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A solution if the coordination complex Na2[Co(SCN)4] has a deep blue colour. the colour is a consequence of laporte allowed and spin allowed transitions metal to ligand charge transfer laporte forbidden and spin allowed transitions laporte forbidden and spin forbidden transitions
Accepted Answer
The deep blue color of the coordination complex Na2[Co(SCN)4] is due to d-d transitions, which are LaPorte forbidden and spin allowed transitions. Here's why:
LaPorte Forbidden: The d-orbitals in the cobalt(II) ion are symmetrical, and transitions between them require a change in parity (symmetry). This type of transition is forbidden by the LaPorte rule. However, the rule can be relaxed due to distortions in the complex, allowing weak absorption of light.
Spin Allowed: The cobalt(II) ion in this complex has a high spin configuration, meaning its d-electrons have the same spin. Transitions between these orbitals are spin allowed, as they do not involve a change in spin state.
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