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Grade 12Inorganic Chemistry

Why is [Fe(CN)6]3− a low spin complex even though it has a free electron?

Profile image of Abdul Jawwad
6 Years agoGrade 12
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2 Answers

Profile image of Arun
6 Years ago
Fe(CN)6]3- is a low-spin complex, whereas [Fe(NCS)6]3- is a high-spin complex. Iron is in +3 oxidation state in both the complexes. octahedral structure resulting from elongation along the z axis
Profile image of Vikas TU
6 Years ago
Dear student 
High spin due to present of unpair electron and when there is no unpair electron in metal then it is low spin
According to Spectrochemical series CN is strong field ligand and it can pairing of electron But H2O is weak field ligand it can't pairing of electron
So [Fe(CN)6]-3 a low spin complex and [Fe(H2O)6]+3] a high spin complex
Good Luck