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Karborany i metalokarborany. Część 2. Metalokarborany

Olejniczak A.

Wiadomości Chemiczne

2005

[Z] 59, 3-4

213--229

Metallacarboranes are cluster compounds that incorporate metal atoms and hydrides of carbon and boron in their polyhedral skeleton. A large number of metals such as Sc, Cr, Mg, Fe, Co, Ni, Cu, Zr, Mn, Ru, Pd, Yb, Ta, Pt, Au have been incorporated as cluster vertices. The chemistry of metallacarboranes originated with observation that the open face of dicarbollide ion (C2B9HII2-) is very similar to the cyclopentadienyl ligand (Cp-) and can form metallacarboranes in the same way as Cp- forms sandwich type complexes. Metallacarboranes are stable, colored crystalline solids that are soluble in organic solvents and well survive exposure to air. Many of them undergo reversible chemical or electrochemical oxidation and reduction. Metal-carborane complexes find an increasing number of applications in catalysis, siloxane-linked polymers, solvent extraction of radionuclides from nuclear waste, materials for nonlinear optics, medicinal diagnosis and treatment, and others.