Reactions of C=C Terminated Self-Assembled Monolayers in Gas-Phase Ozone

An important role in atmospheric chemistry is that of the solve offions of ozone with un gross(a) organic fertiliser surfaces. Potential reactions sites for the atmospheric pollutant ozone are man-made materials that tally C=C functional groups. Previous research has approaching into courtn that carboxylic point-containing products were formed when unsaturated organic monolayers on atomic number 14 react with ozone; a band at 1860cm-1 shows the formation of a strained carbonyl species; oxidation of Au - S poses in saturated self-assembled monolayers of alkanethiols on Au. This article explores the reaction mechanisms of ozone with unsaturated organic surfaces by using C=C terminated alkanethiol SAMs (self-assembled monolayers). This examine uses reprehension - adsorption infrared spectroscopy (RAIRS). A Bruker IFS 66v/S mass spectrometer with a liquid N2 - cooled MCT detector was employ to record the RAIR spectra. all(prenominal) spectrum was collected by using p-pola rized light with an norm of light speed scans. Background references were clean Au substrates with a resolution of 2cm-1. To asperse the effects of background water and former(a) contaminants, the experiment was conducted in a high vacuum, with a closet of 5x10-7Torr. The compass points obtained show the front man of a cruciform and symmetric stretching modes of the methylene units within the hydrocarbon chains. later exposure of the C=C-T SAM to about 1000L of ozone, the beaks associated with the double bonds disappear.

This indicates reactions at the terminal C=C bond. The change in peak position and regulate of the spectra is attributed to the monolayer disor! dering. This disordering could include the effects of the terminal C=C bond reactions as well as oxidation of the Au - S bond. Next, exposure time is increased. This spectra obtained here suggests that the C=C-T SAM reacts with ozone to ab initio form a carboxylic acid intermediate that converts to a carboxylic anhydride group with more exposure. The RAIR spectra show that SAM... If you want to conk a full essay, order it on our website: OrderCustomPaper.com

If you want to get a full essay, visit our page: write my paper