X-ray photoelectron spectroscopy of phthalocyanine compounds

Abstract

X-ray photoelectron spectra arising from carbon Is, nitrogen Is, and iron 2p and 3s levels of metal-free phthalocyanine (H 2 Pc), iron (II) phthalocyanine [Fe (II) Pc], and several derivatives of ironphthalocyanine (FePcL), where L = CI, NO and FePcL 2 , where L = imidazole, 3-chloropyridine, 3picoline) are presented. Measurements on CIs and Nls levels are similar to those published in the literature, using the CIs main peak as an internal calibrant. Fe3s spectra show multiplet splitting for FePc and FePcL compounds while for FePcL 2 there is no observable multiplet splitting. Satellite structure adjacent to the Fe2P1I2' 2P312 lines for FePcL 2 compounds and to the Nls photolines for all compounds studied are observed. The main conclusions on the electron configuration of iron in the phthalocyanine compounds are presented and are used to discuss some unsolved charge transfer and spin state problems.

Comparative study on the performance of pyrolyzed and plasma-treated iron(II) phthalocyanine-based catalysts for oxygen reduction in pH neutral electrolyte solutions

“…They were not resolved because of XPS spectrometer resolution. A small energy separation between chemically different nitrogen atoms was also observed for CuPc, PtPc [19] and CuTPP [18,22]. The latter peak can be attributed to shake-up satellite [20,23,24].…”

“…The differences in oxygen and nitrogen surface concentration were more pronounced. [18][19][20]. The C 1s spectrum of Fe-Pc can be fitted with three elemental bands (peaks C 1 -C 3 in Fig.…”

“…The C 1s spectrum was fitted with a main band at 284.8 eV with full width at half maximum values (FWHM) of 0.8 eV. It is attributed to aromatic C C bonds (graphitic carbons) [18]. This band comes from peripheral carbons of macrocycles [20].…”

Ammonia adsorption on iron phthalocyanine on Au(111): Influence on adsorbate–substrate coupling and molecular spin

“…Regarding the spin changes, similar effects on the spin state are known to occur in coordination chemistry 1,69,70 in the presence of additional ligands such as ammonia and have been observed previously for some phthalocyanine coordination compounds. 71,72 In more detail, we again use the clean multilayer as a crude approximation of the isolated FePc molecule. In Fig.…”

Planar polyphthalocyanine cobalt absorbed on carbon black as stable electrocatalysts for direct methanol fuel cell

“…2(a)-(c) shows Co 2p, nitrogen (N) 1s, and C 1s regions of typical XPS spectra. The spectra were identified according to XPS functional group data reported in the literature [16,17]. According to Co 2p XPS data ( Fig.…”