Cobaltreduzierte

Cobaltreduzierte is a German-language term used in inorganic and organometallic chemistry to describe cobalt-containing species that have been reduced to a lower oxidation state relative to a higher-valent form. The term is commonly applied to cobalt in oxidation states such as +2, +1, or 0, arising from the reduction of cobalt(III) or cobalt(IV) precursors, or from the formation of low-valent cobalt complexes in coordinating environments or on surfaces.

In solution, cobaltreduzierte species often refer to cobalt(II) coordination complexes, while on solid supports or in clusters they can correspond to reduced forms like CoO or metallic cobalt. The concept is central to redox chemistry, where cobalt can cycle between oxidation states during catalytic or electrocatalytic processes.

Preparation of cobaltreduzierte species typically involves chemical reduction from higher oxidation states using reagents such as zinc, iron, hydride donors, or borohydride, as well as electrochemical reduction. In organometallic chemistry, stabilized low-valent cobalt fragments (for example Co(I) or Co(0)) are often coordinated by strong σ-donor ligands and used in catalytic cycles.

Properties of cobaltreduzierte compounds differ from their higher-valent counterparts. They are frequently paramagnetic to varying degrees, may exhibit distinct electronic spectra, and can display different ligand binding behavior and reactivity. The stability of these species is highly dependent on the ligand environment, solvent, and redox conditions.

See also: cobalt, oxidation state, reduction, cobalt(II) complexes, cobalt(III) complexes, low-valent cobalt, organometallic chemistry.