Abstract
p-Cresol derivatives of the Grubbs 2nd generation catalyst were prepared with either hydrogen bonds between p-cresol and the Cl-ligands or ligand exchange between the Grubbs 2nd generation catalyst and thallium p-cresolate to form Ru-O coordination bonds and TlCl. ATR FTIR and UV–Vis spectroscopic studies revealed a blue shift in certain bands, indicating that coordination occurred. X-ray Photoelectron Spectroscopy was recorded for each of the three Ru-complexes. The binding energy of the Ru 3d5/2, Ru 3p3/2 photoelectron line (found at ca. 281 and 462 eV, respectively) of the different complexes showed the influence of the inductive electronic effects of the p-cresol interaction with the complexes. The Cl 2p photoelectron lines indicated ionic and covalent environments, representing the TlCl and the Ru-Cl bonds, respectively. The atomic ratio between Ru:P:Cl:N:Tl confirmed the binding modes of p-cresol to the Grubbs 2nd generation catalyst.
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