C2B3 Ring Tetradecker Sandwiches

Heterotrimetallic sandwiches involving all three cobalt group metals 71-73 have been prepared and isolated 6 3 other tetradecker types synthesized recently include bent,76 arene-endcapped,74 and C2B3-endcapped7S sandwiches 

The electronic properties of C2B3-bridged tetradecker (and larger) sandwich complexes have been examined via electrochemical, ESR, and other methods. In general, it was found that in paramagnetic species the unpaired electron(s) are largely delocalized over the three metal centers. 

---