Quantum chemical calculations at the BP86 level with various basis sets (SVP, TZVPP) were carried out for complexes of carbodiphosphorane analogues E(PPh3)2 with E = C, Si, Ge, Sn, Pb. The equilibrium geometries of the complexes [SiHl+-{E(PPh3)2}] (Si2+-IE) possess the carbodiphosphorane ligand IC is slightly bonded in a tilted way to SiH22+ in the complex Si+-IC, whereas the heavier group-14 ligands E(PPh3h (E = Si, Ge, Sn, Pb) in the complexes Si2+ -I Si - sf+ -I Pb are strongly bonded in side-on fashions. The surprising structures SiH2 2+ -tetrylone complexes possess a strong Si-CI bond between the Si atom of the SiH22+ ftagment and atom CI of the phenyl group. The trend of the bond dissociation energies (BDEs) for the Si-E bond in the Si+-IE complexes is Si2+-IC -.Si2+-ISi - Si2+-IGe Si2+-ISn Si+-IPb. Bonding analysis of the complexes shows that the Si-E bonds have a significant contribution ftom H2Si2+ -E(PPh3)2 x-donation.