1 research outputs found
Evidence for Charge Transfer and Impact of Solvent Polar Properties on Aminobenzonitrile Adsorption on Silver Nanostructures
Aminobenzonitrile adsorption on silver nanoparticles
(SNPs) was
studied with SERS, SEIRA, and DFT. It was found that 4-aminobenzonitrile
(4ABN) and 2-aminobenzonitirle (2ABN) could resonantly distribute
an amino group charge so that the cyano group could strongly interact
with the SNPs in the mono/multilayer. Cyano stretching frequency shifts
in SEIRA spectra showed that a 4ABN multilayer interacted strongly
with the SNPs when deposited using an alkane solvent with nonpolar
bonds. 2ABN could interact with the SNPs even when deposition occurred
using a solvent with polar bonds because intramolecular hydrogen-bonding
in 2ABN limited solvation. 3-Aminobenzonitrile (3ABN) never interacted
strongly with the SNPs in the multilayer because it could not resonantly
distribute the amino group charge. 2ABN also formed C–H hydrogen-bonds
with <i>n</i>-heptane, which could interact with both the
amino and cyano groups of 2ABN. Charge transfer between adsorbed ABN
isomers and the SNPs is evidenced in SERS spectra by the presence
of nontotally symmetric vibrational bands that do not appear intense
in Raman spectra of the ABN powders. It is anticipated that this work
will affect applications where interactions of benzonitrile compounds
with metal nanoparticles is important