Mixed self-assembled monolayers of Co-porphyrin and n-alkane phosphonates on gold

Strong Resistance of Citrate Anions on Metal Nanoparticles to Desorption under Thiol Functionalization

“…Intermolecular hydrogen bonds between adsorbed surfactants should be considered carefully in conjunction with adsorption strength of anchoring moieties . SAMs consisting of weakly coordinated 1,2-dicarboxylic and possibly phosphonic acids or phosphate-based molecules on gold surfaces can be effective when strong hydrogen bonding produces a formation of network layers. This can be an alternative approach for thiol-based molecular layers that are subject to oxidation under ambient conditions and desorb from surfaces. , This study can open avenues for exploring methodologies toward formation of stable SAMs on noble metal surfaces using low-cost, non-oxidizing carboxylate or phosphate/phosphonate compounds.…”

“…The structural modeling and quantitative XPS analyses Intermolecular hydrogen bonds between adsorbed surfactants should be considered carefully in conjunction with adsorption strength of anchoring moieties. 80 SAMs consisting of weakly coordinated 1,2dicarboxylic 11 and possibly phosphonic acids 81 or phosphate-based molecules on gold surfaces can be effective when strong hydrogen bonding produces a formation of network layers. This can be an alternative approach for thiol-based molecular layers that are subject to oxidation under ambient conditions and desorb from surfaces.…”

Porphyrins as Active Components for Electrochemical and Photoelectrochemical Devices

“…Differently from organosulfur compounds, which do not require any preferential solvent for deposition, phosphonic acids require solvents with a hydrocarbon chain (like 1-butanol) which are co-adsorbed to enhance van der Waals interactions. 106 Cobalt(II) 3,7-bis-(3-phosphonopropyl)-2,8,12,17-tetramethylporphyrin was deposited in a pure form or mixed with alkylphosphonic acids ( Figure 13). The resulting monolayers were only slightly inferior in terms of packing, surface coverage and stability with respect to SAMs obtained with alkanethiols of the same length.…”

Optical and electrochemical behavior of new nano-sized complexes based on gold-colloid and Co-porphyrin derivative in the presence of H 2 O 2

“…Moreover, the mechanism for molecular oxygen reduction, in basic environment, was established to undergo via a two-electron process to H 2 O 2 or by a direct four-electron reaction. The most important finding is that the cobalt catalytic centre in the porphyrin moiety preserves its electrocatalytic property even after the self-assembling process took place [6].…”