Four complexes of general formula (mu-(RSi-Y-SiR))Co-2(CO)(6) (Y = CH2CH2, C6H4, CH2-CH2CH2) were formed in the reaction of RSiH2Y-H2SiR with dicobalt octacarbonyl. The complexes were fully characterized, and the x-ray crystal structure analyses indicate a short Si ... Si transannular distance which depends on the nature and the length of the bridge Y.