, der erste Germanium‐„Iniden”︁‐Komplex

\documentclass{article}\pagestyle{empty}\begin{document}$ \left[ {{\text{Cp'}}\left({{\text{CO}}} \right)_2 {\text{Mn}}\dddot - {\text{GeI}}\dddot - {\text{Mn}}\left( {{\text{CO}}} \right)_2 {\text{Cp'}}} \right]^ - $\end{document} , the First Germanium‐“Inidene” Complex Im Gedenken an Herrn Dipl.‐Chem. Jochen Heuser . GeI 2 reacts with Na[{Cp′(CO) 2 Mn} 2 H] to form the inidenetype compound \documentclass{article}\pagestyle{empty}\begin{document}$ \left[ {{\text{Cp'}}\left( {{\text{CO}}} \right)_2 {\text{Mn}}\dddot - {\text{GeI}}\dddot - {\text{Mn}}\left( {{\text{CO}}} \right)_2 {\text{Cp'}}} \right]^ - $\end{document} ( 1 ). The anion 1 contains Ge(0) in a trigonal‐planar coordination, embedded between two Cp′(CO) 2 Mn groups and an iodo ligand. The intrinsic stability of the cumulene \documentclass{article}\pagestyle{empty}\begin{document}$ \left[ {{\text{Cp'}}\left( {{\text{CO}}} \right)_2 {\text{Mn}} = {\text{Ge}} = {\text{Mn}}\left( {{\text{CO}}} \right)_2 {\text{Cp'}}} \right] $\end{document} 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) 2 MnGeI 3 ] − ( 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.