Alternation of Metal‐Bridged Metallacycle Skeletons: From Ruthenapentalyne to Ruthenapentalene and Ruthenaindene Derivative

Abstract

AbstractThe reaction of ruthenapentalyne with one equivalent of isocyanide led to the formation of a rare ruthenapentalene complex by nucleophilic addition. When excess isocyanides were used, the metal‐bridged ruthenaindene derivatives can be isolated and were formed by one carbon of isocyanide insertion into the ruthenacycle. Complexes 3 represent the first metallaindene derivatives with a second‐row transition metal at the bridge‐head position. The transformations from ruthenapentalyne via ruthenapentalene to ruthenaindene derivatives are of interest and can be extended to the syntheses of other polycyclic ruthenacycles. These unique metallacycles exhibit considerable stability and broad spectral absorption spanning the visible spectrum, enabling their potential applications in photoelectric materials.