Scanning the surface of potential energy when changing the C²-H distance for diazonium salts (DFT B3LYP 6-31G(d,p)):

• 4-MeOPhN₂⁺
• 4-MeOPhN₂⁺ BF₄^-
• 4-MeOPhN₂⁺ CF₃COO^-
• 4-MeOPhN₂⁺ Cl^-
• 4-MeOPhN₂⁺ HSO₄^-
• 4-MeOPhN₂⁺ TfO^-
• 4-MeOPhN₂⁺ TsO^-
• 4-NO₂PhN₂⁺
• 4-NO₂PhN₂⁺ BF₄^-
• 4-NO₂PhN₂⁺ CF₃COO^-
• 4-NO₂PhN₂⁺ Cl^-
• 4-NO₂PhN₂⁺ HSO₄^-
• 4-NO₂PhN₂⁺ TfO^-
• 4-NO₂PhN₂⁺ TsO^-
• PhN₂⁺
• PhN₂⁺ BF₄^-
• PhN₂⁺ CF₃COO^-
• PhN₂⁺ Cl^-
• PhN₂⁺ HSO₄^-
• PhN₂⁺ TfO^-
• PhN₂⁺ TsO^-