Percentage variation (ε₁ = [(ΔE_oi^1β − ΔE_oi^1β_ref)/ΔE_oi^1β_ref] × 100; ε₂ = [(ΔE_oi² − ΔE_oi²_ref)/ΔE_oi²_ref] × 100) with respect to a reference value (values for I and I^C) of the orbital interaction associated to ΔE_oi^1β and ΔE_oi² for complexes [^tBu₃PAuI]–[^tBu₃PAuVI] and ΔE_oi¹ and ΔE_oi² for complexes [^tBu₃PAuI^C]⁺–[^tBu₃PAuVI^C]⁺.

	ε 1		ε 2
	Aluminyl	Carbene	Aluminyl	Carbene
I/IC	0.0	0.0	0.0	0.0
II/IIC	0.0	6.9	0.0	−14.4
III/IIIC	1.7	8.6	2.3	−11.3
IV/IVC	0.3	0.0	2.3	−7.2
V/VC	1.7	2.1	2.3	2.1
VI/VIC	2.7	6.4	9.3	22.7