Reaction of imidazole in gas phase at very low pressure with Cu foil and Cu oxides studied by X‐ray photoelectron spectroscopy

Abstract

The gas‐phase reactions of imidazole with Cu foil, CuO and Cu2O powders at a pressure of 10−5 Torr are studied by means of X‐ray photoelectron spectroscopy (XPS) at room temperature for 1 h. The reactivity of gaseous imidazole is very intense with Cu foil, weak with CuO and nil with Cu2O. The reaction product on the Cu foil is cuprous imidazolate of oligomeric nature and with CuO is cupric imidazolate of very low molecular weight. Copyright © 2006 John Wiley & Sons, Ltd.

The roles of mercapto, benzene and methyl groups in the corrosion inhibition of imidazoles on copper: I. Experimental characterization

“…The positions of cuprous species at 570.2 eV (LMM peak) and 932.5 eV (XPS 2p 3/2 peak) agree well with those in the literature reporting the formation of protective cuprous complex between copper and inhibitor molecules, as follows: Cu or Cu 2 O and vapored imidazole (Cu 2p 3/2 at 932.6 eV)[65], a Cu complex with 2-mercaptobenzimidazole formed chemically (Cu 2p 3/2 at 933.5 eV)[54], aCu complex with 2-mercaptobenzimidazole formed by immersion in NaCl solution (Cu LMM at 570.0 eV) [15], and a Cu complex formed by immersion of copper in BimH solution (Cu 2p 3/2 at 933.1 eV) [56]). The position of cupric species at 934.3 eV agrees well with those for cupric complexes produced chemically, e.g.…”

Post‐Synthetic Modification of ZIF‐8 Crystals and Films through UV Light Photoirradiation: Impact on the Physicochemical Behavior of the MOF

“…The as‐synthesized ZIF‐8 crystals showed a symmetric C1s signal that could be correctly adjusted only with two components (Figure a, Table ). The smallest peak was attributed to spurious carbon which was at 284.8 eV (FMHW 2.3 eV) whereas the more intense C1s signal is due to the two equivalent carbons linked to the N and C of the methyl‐imidazolate ligand (Mim) at 285.5 eV, according to the BE value reported for imidazolates . Moreover, the presence of CO 3 2− on the surface should generate a signal around 289 eV but it was not possible to fit a component to such BE.…”

“…The kinetic energy (KE) value was compatible with both Zn 2+ species of the MOF structure and zinc hydroxide species, but surface ZnO was ruled out, both by the position of the Auger signal (which in this case should be at 988.6 eV) and by the absence of oxygen from oxides (O 1s at 529.9 eV) . Meanwhile, a symmetric N 1s peak was observed at 399.1 eV (Table , Figure S2) corresponding to nitrogen atoms bound to the metal cation, in agreement with this type of imidazolates . In addition the areas of the signals were quantified considering the response factors of each element and the atomic ratios C/N and Zn/N were calculated (Table ).…”

Synthesis of porous Cu2O/CuO cages using Cu-based metal–organic frameworks as templates and their gas-sensing properties

“…Judging from the positions, the two main peaks mainly originate from Cu + , rather than from Cu 2+ , because XPS peaks of Cu 2+ usually appear at higher energy positions (953.6 AE 0.4 eV and 933.6 AE 0.3 eV). 53,54 However, some satellite peaks corresponding to electronic shake-up are observed in the Cu2p XPS spectra of the three samples, accompanied by 2p 1/2 and 2p 3/2 peaks. The presence of the satellite peaks proves the existence of CuO on the cage surface, because of their absence in Cu 2 O.…”