الخلاصة:
The work described in this brief report a structural study by DFT hypothetical complex 36 valence éléctrons of the type [M2{CO}5](pentalène) ( M = Co and Rh ) with two different grafts M(CO)3 and M(CO)2 where in two metal atoms are linked to pentalèneque ligand. This theoretical study shows the modes of coordination pentalène thus varying a M-M connection is preferd to M-pentalène bond, as a structure having a carbonyl ponteur.