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Discuss the magnetic behaviour of [Fe(CN)6 ] 3– and [FeF6 ] 3–

Discuss the magnetic behaviour of [Fe(CN)6
]
3– and [FeF6
]
3–

Grade:9

1 Answers

Sunil Kumar FP
askIITians Faculty 183 Points
6 years ago
Fe prefers to exist as Fe3+and is known to have acoordination numberof six. Since the configuration of Fe3+has five d electrons, we would expect to see five unpaired spins in complexes with Fe. This is true for [FeF6]3-; however,[Fe(CN)6]3-only has one unpaired electron, making it a weaker magnet. This trend can be explained based on the properties of the ligands. We expect CN−to have a stronger electric field than that of F−, so theenergylevel differences should be greater for the cyanide complex, resulting in something like this: .204-1124_magnetism.png

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