The recent revival of CL2 as divalent carbon (0) compounds, in which the carbon atom retains two - -2] has opened the door to a (E=Si, Ge, Sn, Pb) bond in some [Bis- 2H2] E=Si Pb (Fig. 1) complexes. The geometries of the molecules were optimized at both BP86, and B3LYP, levels of theory using def2-TZVPP basis set. In all cases the vibrational frequency analyses, calculated at the same level of theory, indicated that the optimized structures are at the stationary points corresponding to local minima without any imaginary frequency.Calculations were performed using the GAUSSIAN 09 program. The AIM 2000 package was used to obtain the bond properties. Wave function files were generated from the Gaussian output files at the BP86, B3LYP levels of theory, using def2-TZVP basis set to perform AIM calculations. NBO analyses were also carried out with the internal module GAUSSIAN 09. The result show that in these complexes the HOMO bonder order is less than a single bond.
