“…Complexes with bent or linear M-E-R (M = transition metal, E = Group 14 element, R = organic substituent) arrangements were investigated by Power et al and Filippou et al [28] Depending on the bond order between transition metal and low valent Group 14 element, either al inear metal tetrylidyne, M E-R, or am etallo tetrylene, M-E-R, with ab ent geometry,w as found. [18,28,29] To explore the nature of the bonding in the cationic complex 7,q uantum chemical calculations were carried out. The DFT-optimized geometry of 7 ( Figure 4) was in good agreement with the solid-state structure (for details, see the Supporting Information).…”