The group electronegativity of the R-groups of the ligand influences the XPS binding energies and the amount of charge transferred in the Mn 2p3/2 photoelectron lines. DFT studies illustrated different Jahn–Teller elongation bond stretch isomers.

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CO Cr CO CO OC OC X Keywords:Fischer carbene complex; XPS; silane anchoring. Highlights •Synthesis of Si-supported amino Fischer carbenes.• X-ray photoelectron spectroscopy of supported amino Fischer carbenes.• Cr 2p 3/2 binding energies of ethoxy-, amino-and Si-supported Fischer carbenes AbstractEthoxy chromium (0) Fischer carbene pentacarbonyl complexes [(CO) 5 CrC(OEt)R]; R = 2thienyl (1), 2-furyl (2) were covalently anchored onto aminopropyltrimethoxysilanefunctionalised silicon-wafers to form Cr-grafted Si-wafers S1 and S2 that were characterized by X-ray photoelectron spectroscopy (XPS). X-ray photoelectron spectroscopy determined that binding energy of the Cr 2p 3/2 photoelectron line of the thienyl-containing complexes were smaller than that of the furyl-containing complexes. The binding energy of the Cr 2p 3/2 photoelectron line of the ethoxycarbene complexes was smaller than that of aminocarbenes.The binding energy of the Cr 2p 3/2 photoelectron line of the Cr-grafted Si-wafers were ca. 1 eV higher than that of the related aminocarbenes. A 25 -33 % anchoring of the Crcomplexes 1 and 2 on the aminopropyltrimethoxysilane-functionalised silicon-wafers was achieved.

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