Table 3. Topological Parameters Including Total Energy Density (H_b, au), Laplacian (∇²ρ_b, au), and Electron Density (ρ_b, au) at BCPs for the (X-T-X₃)₂ Homodimers (where T = C, Si, and Ge, and X = F, Cl, and Br) at the Most Favorable T/X···T/X Distances.

homodimer	ρb	∇2ρb	Hb	ρb	∇2ρb	Hb
	tetrel···tetrel			tetrel···halogen
(F-C-F3)2	0.0021	0.0102	0.0005	0.0028	0.0143	0.0007
(Cl-C-Cl3)2	0.0038	0.0124	0.0008	0.0043	0.0157	0.0010
(Br-C-Br3)2	0.0041	0.0121	0.0007	0.0052	0.0159	0.0008
(F-Si-F3)2	0.0005	0.0030	0.0003	0.0043	0.0199	0.0009
(Cl-Si-Cl3)2	0.0036	0.0115	0.0007	0.0037	0.0131	0.0008
(Br-Si-Br3)2	0.0041	0.0121	0.0007	0.0043	0.0136	0.0008
(F-Ge-F3)2	noa	noa	noa	0.0051	0.0224	0.0009
(Cl-Ge-Cl3)2	0.0036	0.0114	0.0007	0.0038	0.0132	0.0008
(Br-Ge-Br3)2	0.0040	0.0119	0.0007	0.0045	0.0139	0.0007
	type III halogen···halogen			type II halogen···halogen
(F-C-F3)2	0.0035	0.0197	0.0011	0.0034	0.0170	0.0008
(Cl-C-Cl3)2	0.0049	0.0228	0.0015	0.0067	0.0265	0.0015
(Br-C-Br3)2	0.0063	0.0234	0.0011	0.0097	0.0297	0.0009
(F-Si-F3)2	0.0021	0.0108	0.0006	0.0048	0.0221	0.0010
(Cl-Si-Cl3)2	0.0045	0.0196	0.0013	0.0058	0.0221	0.0013
(Br-Si-Br3)2	0.0058	0.0206	0.0010	0.0073	0.0230	0.0010
(F-Ge-F3)2	0.0025	0.0125	0.0007	0.0056	0.0251	0.0010
(Cl-Ge-Cl3)2	0.0052	0.0221	0.0014	0.0064	0.0244	0.0014
(Br-Ge-Br3)2	0.0065	0.0227	0.0010	0.0081	0.0248	0.0009

^aNo local energy minimum was observed in the corresponding PES curve (see Figure 4).