Spectroscopy and electrochemical characterization of Langmuir–Blodgett and physical vapor thin films of 29-membered diazocrown ether 1 with two n-octyl substituents

UV–vis and FTIR spectroscopy and electrochemistry studies were performed on Langmuir–Blodgett (LB) and on physical vapor deposition (PVD) films of 29-membered diazocrown ether with two n-octyl substituents. FTIR and UV–vis measurements showed that PVD and LB films have distinct bands and dissimilarities in their intensities. PVD and LB films on ITO electrodes were also used as electrodes in cyclic voltammetry. Voltammograms showed that PVD and LB films have a distinct response for ions K+, but only LB film has specific selectivity to K+ ions.

Molecular structure of 29-diazocrown ether 1 with two n-octyl substituents used to fabricate Langmuir–Blodgett and physical vapor ultrathin films. They are characterized by spectroscopy and used as electrodes in cyclic voltammetry, showing that films have a distinct response and that the Langmuir–Blodgett film has specific selectivity to K+ ions.Figure optionsDownload as PowerPoint slideHighlights
► In this work PVD and LB films of 29-membered diazocrown ether were studied.
► Spectroscopic absorbance results pointed out differences on film architecture.
► Distinct responses were observed on cyclic voltammetry measurements for each film.
► Cyclic voltammetry for LB films showed specific selectivity to K+ ions.