Synthesis and characterization of a catechol-terminated alkanethiolate monolayer adsorbed on gold

Noradrenaline and a Thiol Analogue on Gold Surfaces: An Infrared Reflection−Absorption Spectroscopy, X-ray Photoelectron Spectroscopy, and Near-Edge X-ray Absorption Fine Structure Spectroscopy Study

“…The peak at about 285.8 eV is assigned as hydroxyl carbons in the aromatic ring (carbons 3 and 4 in Figure ), the peak at about 286.2 eV is assigned as the amine carbon (carbon 8, see Figure ), and the peak at 286.5 eV is assigned as the hydroxyl carbon (carbon 7, see Figure ). The assignments, for these binding energy positions, are in agreement with the literature, − for example the study of immobilized peptides on TiO 2 surfaces done by Iucci et al and the work of alkanethiol terminated with a catechol group reported by Simmons et al The low broad structure at the high binding energy side, at about 290 eV, is assigned to shakeup satellites for the aromatic carbons and possibly contaminations. The small peak, positioned at 287.7 eV, is assigned as quinone carbons, as noradrenaline is easily oxidized by molecular oxygen .…”

A study on the aqueous dispersion mechanism of CuO powders using Tiron

“…The steric arrangement of the alcohol functional groups in the organic molecule influences the type of ligand formed: the two hydroxyl groups in ortho-positions and the relative arrangement of the sulfonate groups in meta-position sterically favors coordination of both alcohol groups to available oxide surface sites, with formation of bidentate complexes [18,19]. Regarding the number of binding sites at the metallic oxide surface, several studies on the formation of copper-catechol and copper-Tiron complexes [35][36][37] demonstrate that the most likely stoichiometry at low ionic strength is 1:1. Hence, it is suggested that Tiron adsorption upon CuO powders surface takes place through formation of a bidentate binuclear chelate (Fig.…”

Effect of the surfactant nature on the thermo-stability of surface modified SnO2 nanoparticles

“…2(b)) dried at 110°C and treated at different temperatures for 1 h. For comparison purpose, the spectra of Catechol Ò and Maptac Ò are also displayed in Fig. 2 [10][11], are not observed in the surface modified powder spectra. It evidences the deprotonation of hydroxyl groups, indicating that the surface immobilization process occurs by the two oxygen atoms of Catechol Ò molecules.…”