An improved method for deconvoluting energy-resolved collision-induced dissociation cross sections yields ligand binding energies for organometallic complexes with substantially less prior information than before. Application to isomeric 2:1 complexes of azabox ligands with Cu(I) gives consistent results for the binding energies of the ligands to homo- and heterochiral complexes with pseudo-enantiomeric ligands for cases where previous deconvolution methods had failed to give satisfactory results.