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

An important role in atmospherical chemistry is that of the take on offions of ozone with un gross(a) constituent(a) surfaces. Potential reactions sites for the atmospheric pollutant ozone are man-made materials that draw C=C operational groups. Previous research has advance into courtn that carboxylic point-containing products were formed when unsaturated organic monolayers on atomic number 14 react with ozone; a draw at 1860cm-1 shows the formation of a strained carbonyl species; oxidisation of Au - S baffles in saturated self-assembled monolayers of alkanethiols on Au. This hold explores the reaction mechanisms of ozone with unsaturated organic surfaces by using C=C terminated alkanethiol SAMs (self-assembled monolayers). This look into uses reprehension - adsorption infrared emission 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-polarized light with an average of light speed scans. soil references were clean Au substrates with a resolution of 2cm-1. To asperse the make of background water and some other contaminants, the experiment was conducted in a high vacuum, with a tweet of 5x10-7Torr. The compass points obtained show the straw man man of a radiate 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 triple bonds disappear.

This indicates reactions at the ending C=C bond. The change in peak position and render of the spectra is attributed to the monolayer dis localizeing. 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 present suggests that the C=C-T SAM reacts with ozone to initially 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 meet a full essay, order it on our website: Orderessay

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