Impact of choice of alkane deposition solvent on 4-fluorobenzoic acid layers adsorbed on silver nanostructures

Add time:07/18/2019    Source:sciencedirect.com

Surface-enhanced infrared absorption (SEIRA) experiments revealed that the chain length and evaporation rate of alkane deposition solvents altered 4-fluorobenzoic acid (4FBA) adsorption. 4FBA did not dissociate in the multilayer with the fast-evaporating n-pentane deposition solvent. However, with n-hexane and heavier solvents, the evaporation rate was slow enough to allow significant formation of 4-fluorobenzoate ions (4FBI) in the multilayer. Strong intermolecular attractions were present with heavier deposition solvents as evidenced by the incorporation of n-heptane into the 4FBI multilayer. This work will apply to many synthetic, biological, and environmental areas involving the interaction of metal nanostructures with oxygenated or halogenated hydrocarbons.

► 4-Fluorobenzoic acid (4FBA) adsorbs as 4-fluorobenzoate ion (4FBI) in monolayer on silver nanostructures. ► 4FBA does not ionize in multilayer using n-pentane as deposition solvent. ► 4FBA ionizes to 4FBI in multilayer using n-hexane deposition solvent. ► Strong intermolecular attractions occur between 4FBI and n-heptane (or a heavier alkane solvent) in the multilayer.

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