Electronic effects of group fragments on the XPS of Fe 2p and 3p photoelectron lines of ferrocenyl-containing chalcones

A series of ferrocenyl-containing chalcones, Fc-CO-CH=CH-C 6 H 4 R, with the R-group on the para-position on the phenyl ring and R = OCH 3 (1), CH 3 (2), C 6 H 5 (3), tBu (4), H (5), Br (6) and CF 3 (7) were subjected to an X-ray photoelectron spectroscopy (XPS) study.The linear relationships obtained between the Gordy-scale group electronegativity of molecular fragment R, ÷ R , and the maximum binding energies of the Fe 2p 3/2 and the Fe 3p 3/2 photoelectron lines, confirmed communication between the iron atom of the ferrocene moiety and the molecular fragments, R, of 1-7.These relationships illustrated that the influence of the electronic properties of the molecular fragments are more pronounced in the Fe 3p photoelectron lines than in the Fe 2p photoelectron lines.