Bis(eta(5)-cyclopentadienyl)[mu-(4b,5,5a-eta(3):9b,10,10a-eta(3))-2,3,7, 8-tetrakis(trimethylsilyl)benzo[3,4]cyclobuta[1,2-b]biphenylene]-syn-dic obalt (Co-Co), a Dinuclear pi-Complex of the Linear[3]Phenylene Framework

The title compound was made by the reaction of the CpCo-complex of 2,3,7,8-tetrakis(trimethylsilyl) linear [3]phenylene, in which the metal coordinates one of the cyclobutadiene rings, with CpCo(C2H4)(2). Because of its relative stability, a syn-dicobalt-bound configuration is indicated rather than its anti alternative.