, der erste Germanium‐„Iniden”︁‐Komplex

Abstract

, the First Germanium-“Inidene” Complex1 GeI2 reacts with Na[{Cp′(CO)2Mn}2H] to form the inidenetype compound (1). The anion 1 contains Ge(0) in a trigonal-planar coordination, embedded between two Cp′(CO)2Mn groups and an iodo ligand. The intrinsic stability of the cumulene is still apparent in the structure of 1: The Ge—Mn bonds are short (229 pm) while the Ge—I distance is rather long (284 pm). The inidene-type anion 1 can only be obtained from the above-mentioned reaction if the reaction is quenched by addition of unpolar solvents, thus eliminating starting materials and coproducts. Direct workup of the reation mixture instead leads to [Cp′(CO)2MnGeI3]− (2) as the only isolated product. The transformation of 1 into 2, which contains Ge in the formal oxidation state +2, necessarily implies redox processes, which are well documented in inidene chemistry.