The complex utilizes inner orbital (3d) hybridization, forming six pairs of electrons from NH₃ ligands in octahedral geometry, resulting in diamagnetism due to the absence of unpaired electrons.
What is the hybridization scheme for the diamagnetic octahedral complex [Co(NH₃)₆]³⁺, and why is it diamagnetic?
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The hybridization scheme for the diamagnetic octahedral complex [Co(NH₃)₆]³⁺ involves the hybridization of cobalt’s 3d, 4s, and three 4p orbitals, resulting in six equivalent sp³d² hybrid orbitals. Each ammonia ligand donates an electron pair for bonding. Diamagnetism arises due to the absence of unpaired electrons in the complex, resulting from the pairing of electrons in the hybrid orbitals. The overlap of these hybrid orbitals with the ligand orbitals forms strong, directed bonds, and the overall geometry is octahedral. The lack of unpaired electrons contributes to the diamagnetic nature of [Co(NH₃)₆]³⁺.