Related Experiment Video
Updated: Jun 9, 2026

Preparation of 6-aminocyclohepta-2,4-dien-1-one Derivatives via Tricarbonyl(tropone)iron
Published on: August 12, 2019
Synthesis and characterization of an iron(IV) ketimide complex
Richard A Lewis1, Guang Wu, Trevor W Hayton
1Department of Chemistry and Biochemistry, University of California, Santa Barbara, California 93106, USA.
Abstract:
Addition of 4 equiv of LiN═C(t)Bu(2) to FeCl(2) in Et(2)O/THF results in the formation of [Li(THF)](2)[Fe(N═C(t)Bu(2))(4)] (1). Oxidation of 1 with 0.5 equiv of I(2) in Et(2)O/DME yields [Li(DME)][Fe(N═C(t)Bu(2))(4)] (2) in moderate yield. Both 1 and 2 are high spin and exhibit tetrahedral geometries in the solid state. Oxidation of 1 with 1 equiv of I(2) in Et(2)O yields Fe(N═C(t)Bu(2))(4) (3) in good yield. Surprisingly, complex 3 exhibits a diamagnetic ground state and a nearly square planar geometry about the Fe center.
Related Concept Videos
Formation of Complex Ions
Complexation Equilibria: Factors Influencing Stability of Complexes
Colors and Magnetism
When atoms or molecules absorb light at the proper frequency, their electrons are excited to higher-energy orbitals. For many main group atoms and molecules, the absorbed photons are in the ultraviolet range of the electromagnetic spectrum, which cannot be detected by the human eye. For coordination compounds, the energy difference between the d orbitals often allows photons in the visible range to be absorbed and emitted, which is seen as colors by the human eye.
Structural Isomerism
Isomers are different chemical species that have the same chemical formula. Structural isomerism of coordination compounds can be divided into two subcategories, the linkage isomers and coordination-sphere isomers.
Linkage isomers occur when the coordination compound contains a ligand that can bind to the transition metal center through two different atoms. For example, the CN− ligand can bind through the carbon atom or through the nitrogen atom. Similarly, SCN− can be...
Complexometric Titration: Overview
Complexation Equilibria: Overview
The equilibrium constant of the complexation reaction is represented as the formation constant...

