NEW UPSWING OF ORGANOLANTHANOID RESEARCH - A VERY PROMISING REVIVAL OF ORGANOCERIUM(IV) CHEMISTRY AND THE FIRST STABLE LANTHANOID(II/III) CARBENE COMPLEXES

Less conventional oxidation states of the lanthanoids become important in complexes in which ligands such as trimethylsilyl‐substituted cyclooctatetraene anions or imidazol‐2‐ylidenes coordinate to the metal ion. These types of Lnn+ complexes (n ≠ 3), which were still ignored ten years ago, may have sandwich or even oligodecker structures (see, for example, picture on the right) or contain carbene‐like η1‐bound ligands. (Figure Presented.) Copyright © 1994 by VCH Verlagsgesellschaft mbH, Germany