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Lab 3 Synthesis And Analysis

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Chem 2200 Date:March 13th, 2016 Lab 6: Synthesis and Analysis of [1,3,5-C6H3(CH3)3]Mo(CO)3 Abstract: The purpose of this experiment is to use the apparatus shown in figure 7-1 of experiment 6 found in the lab manual, to synthesize [1,3,5-C6H3(CH3)3]Mo(CO)3.(2016 Oleg) With this, characterization of the molecule can be accomplished using the infrared spectrum and NMR spectrum of the synthesized compound. It was found in the IR spectra of the product, that suitable stretches were found associated with the C-O bonds of mestylene and molybdenum. With One strong spectra was found at 1855.3973 cm-1 , one medium strength spectra was found at 1942.6002 cm-1 , and one weak spectra of C-O stretch was found at 1298.8638cm-1 . The 1H NMR spectrum of the product showed peaks at δ 2.28 and 5.25, while the H NMR spectrum of mesitylene gave peaks at δ …show more content…

Benzene and its derivatives have been found to replace donor ligands. In this experiment one is looking to replace the CO groups in a molybdenum complex. By refluxing the Mo(CO6) in mestylene it is possible to produce 1,3,5-C6H3(CH3)3]Mo(CO)3. The benzene molecules replace 3 of the CO bonds and rest parallel to the plane of the remaining CO groups. The products geometry is such that it can be considered octahedral as opposed to tetrahedral. The carbonyl to molybdenum bonds are close to 90 degrees instead of 109.5 which is indicative of a tetrahedral complex. Using H NMR and infrared spectrum it is possible to analyze the product and determine its relative structure and composition. CO stretches have unique places within the spectrum and thus can be noted. H NMR can be used to determining the structure by comparing it to that of mestylene. Looking at these spectrum’s allows for one to look for indication of methyl group

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