Adsorption and stability of phthalic acid on a colloidal silver surface: surface-enhanced Raman scattering study

Abstract

The adsorption characteristics of phthalic acid on a silver surface were investigated by means of surfaceenhanced Raman scattering (SERS). For a reliable analysis of the SER spectrum, we also performed an ab initio vibrational wavenumber calculation. The SER spectral features dictated that the phthalic acid molecules should be bound to silver as dicarboxylate, but in contrast with earlier reports, with a strongly tilted orientation with respect to the surface normal. The degree of tilt appeared to increase with increase in the bulk pH. Such a tilted orientation was presumed to occur by the simultaneous s-and p-type coordination of carboxylate groups to silver caused by the steric hindrance and electrostatic repulsion between the two carboxylate groups. Probably owing to the latter effects, phthalic acid on silver was easily displaced with aromatic mono-acids that could be bound to silver by forming only s-type coordination. A s-type coordination therefore seemed to be more important than a p-type coordination for an aromatic carboxylic acid derivative to assemble a robust monolayer on a silver surface.

Adsorption of 4,4′‐biphenyl diisocyanide on gold nanoparticle surfaces investigated by surface‐enhanced Raman scattering

“…1 Numerous studies on the adsorption characteristics of organothiols have been reported in the last two decades. 2,3 Many molecules, including carboxylic acids 4 and nitriles, 5 adsorbed on metal surfaces have also been studied by the self-assembly technique.…”

Raman spectroscopic identification of phthalic and mellitic acids in mineral matrices

“…1a, phthalic acid belongs to the ortho-disubstituted benzenes and its molecular symmetry is C 2 . The Raman vibrational assignments of phthalic acid were made independently by different authors [16][17][18], and they slightly differ from each other. The key vibrational signs are situated in the area between 1700 and 700 cm −1 .…”

High Performance Conductive Adhesives for Lead-Free Interconnects

“…The adsorption of carboxylic acids on silver has been studied [9][10][11][12]. The adsorption of carboxylic acids on silver has been studied [9][10][11][12].…”