Synthesis of Selected Transition Metal and Main Group Compounds With Synthetic Applications

The synthesis, structures, and magnetic properties of monomeric half-sandwich iron and cobalt imidazolin-2-iminato complexes have been comprehensively investigated. Salt metathesis reactions of [Cp'M(μ-I)] 2 (1-M, M = Fe, Co; Cp' = η 5 -1,2,4-tri-tertbutylcyclopentadienyl) with [Im Dipp NLi] 2 (Im Dipp N = 1,3-bis(2,6diisopropylphenyl)imidazolin-2-iminato) furnishes the terminal halfsandwich compounds [Cp'M(NIm Dipp )] (2-M, M = Fe, Co), which can be regarded as models for elusive half-sandwich iron and cobalt imido complexes. X-ray diffraction analysis confirmed the structure motif of a one-legged piano stool. Complex 2-Co can also be prepared by an acid−base reaction between [Cp'Co{N(SiMe 3 ) 2 }] (3-Co) and Im Dipp NH. The electronic and magnetic properties of 2-M and 3-Co were probed by 57 Fe Mossbauer spectroscopy (M = Fe), X-band EPR spectroscopy (M = Co), and solid-state magnetic susceptibility measurements. In particular, the central metal atom adopts a high-spin (S = 2) state in 2-Fe, while the cobalt complex 2-Co represents a rare example of a Co(II) species with a coordination number different from six displaying a low-spin to high-spin spin-crossover (SCO) behavior. The experimental observations are complemented by DFT calculations.

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Pogo-Stick Iron and Cobalt Complexes: Synthesis, Structures, and Magnetic Properties

Peters

Baabe

Maekawa

et al. 2019

Inorg. Chem.

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Synthesis of Selected Transition Metal and Main Group Compounds With Synthetic Applications

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Pogo-Stick Iron and Cobalt Complexes: Synthesis, Structures, and Magnetic Properties

Pogo-Stick Iron and Cobalt Complexes: Synthesis, Structures, and Magnetic Properties

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