XPS analysis of electronic density of iron tetraazamacrocycle through Fe 2p binding energies on the 3‐imidazolilpropyl‐modified surface of oxidized n‐Si(100)

Abstract

This paper describes the preparation of metallo-organic thin films of [FeTIM(CH 3 CN) 2 ]2+ complex, where TIM stands for 2,3,9,10-tetramethyl-1,4,8,11-tetraazacyclotetradeca-1,3,8,10-tetraene on oxidized silicon wafer, SiO 2 /Si, previously treated with 3-imidazolilpropyltrimethoxysilane, 3-IPTS. X-ray photoemission lines of Fe 2p were used to probe the iron chemical environment in the physically and chemically adsorbed macrocycle complexes. As FeTIM can bind CO, NO or N-heterocycle, a built-on Si wafer sensor device could be envisaged for these molecules.

Photodynamic Therapy: Porphyrins and Phthalocyanines as Photosensitizers

“…[91,92] This stability, together with the versatility of possible applications and the evident biological relevance, has stimulated various studies about these compounds. Macrocycles have been employed in surface modification (thin films), [93,94] supramolecular systems (super molecules), [95,96] reconstitution of haemoproteins, [97][98][99] model complexes of haemoproteins, biosensors, and others. [100,101]…”

Adsorption of silanes bearing nitrogenated Lewis bases on SiO2/Si (100) model surfaces

“…5, which was fitted with two components at 399.7 and 401.9 eV, assigned to nonprotonated and protonated imidazole groups, respectively. The protonation could result either from the interaction between the bent 3-IPTS and the surface silanol groups with a consecutive proton transfer [14,15,22], or from the reaction with the hydrogen chloride obtained as a by-product from the reaction of 3-ClPTS and imidazole, or by proton transfer from adlayer water.…”

“…Although the two-step procedure reported by Andresa et al [14] has shown higher surface yields, our attention has been devoted to the one-pot method, as it is an easier and more reliable procedure. Fig.…”

“…To synthesize the 4-PTSIP silane in a typical procedure, 2.5 ml of 3-APTS (10.7 mol) and 1.0 ml of 4-PCA (10.5 mol) were mixed in acetonitrile for 3 h under reflux at 80 • C. A two-step work-up procedure was used, as previously reported [14], and the product was characterized by GC-MS (EI): m/z 310 (M +• ).…”

“…Gushikem and co-workers [11][12][13] previously reported the adsorption of the 3-IPTS on silica gel using the one-pot setup to graft the 3-IPTS in order to use it in metal chloride uptake from ethanolic solutions. We have adapted their methodology as well as developing a two-step technique in our laboratory [14] to produce the 3-IPTS modified silicon wafer surface.…”