Notes tadiene and trimethylenemethane are similar.However, the fact that the weighted average of the C Is binding energies of the trimethylenemethane ligand is actually slightly less than the C Is binding energy of the butadiene ligand suggests slightly greater back-bonding to trimethylenemethane than to butadiene. This interpretation is consistent with the fact that the Fe 2p3/2, carbonyl C Is, and O Is binding energies are higher (by 0.30, 0.14, and 0.07 eV, respectively) in the trimethylenemethane complex than in the butadiene complex. Indeed, even infrared C-0 stretching frequencies indicate more back-bonding to the trimethyleneemethane ligand than to the butadiene ligand.22
The reaction of RuCl3 with the azo ligands (I) afforded the pseudooctahedral complexes (II) (X: ‐ Cl) and (III) containing the ligands bond in a different manner (IR and 1H NMR evidence).
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