Fig. 4. Free energy reaction profile for the CO2 insertion into the Au–Al bond in the [tBu3PAuAl(NON′)] (I, black lines), [tBu3PAuAl(SiNON′)] (II, blue lines), [tBu3PAuAl(NCCN′)] (III, red lines), [tBu3PAuAl(DippBDI-H′)] (IV, violet lines), [tBu3PAuAl(CAA′)] (V, grey lines) and [tBu3PAuAl{C(SiH3)2CH2}2] (VI, green lines) complexes. ΔG values refer to the energy of the separated reactants taken as zero. Activation free energy barriers are reported in parentheses. The results for [tBu3PAuI] and [tBu3PAuII] have been taken and adapted from ref. 33 and 45.
