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Unknown Monoterpene Lab Report

1348 Words6 Pages

In this experiment, the goal was to identify the unknown monoterpene assigned by infrared spectroscopy, ultraviolet-visible spectroscopy, and 1H NMR spectroscopy. The hypothesis was that the unknown monoterpene was citronellol. The hypothesis was confirmed through the spectroscopes conducted. The ultraviolet-visible spectroscopy showed a 214nm with an absorbed energy of 1.006ε. Since it was under 220nm, it showed that there was only one double bond in the molecule. The infrared frequencies did not confirm the hypothesis because it showed functional groups that the other monoterpenes also had. The 1H NMR spectroscopy confirmed the hypothesis because it showed one C-H bond and geraniol has two of these groups. This experiment could be more …show more content…

The machine that was used for this experiment was a Thermo Scientific PicoSpin 45. The unknown compound was mixed with tetramethylsilane to use as a reference. This 1mL mixture was then put inside of a syringe and fed into the machine. There were ten peaks that were observed in the results. The highest peak shown was at 5.11ppm and this represents the hydrogen that is attached to the carbon involved in the double bond. This does not confirm the hypothesis because geraniol also has a double bond in its molecule. The next peak at 4.63ppm shows the hydrogen that is in the alcohol functional group. This peak also does not confirm the hypothesis because geraniol has an alcohol group in its molecule. The peaks at 3.73ppm, 3.58ppm, 1.91ppm, and 1.58ppm are the carbons in the chain with two hydrogens attached to it. The monoterpene, geraniol, also has four of these groups in its molecule so this also does not confirm the hypothesis. The next peak is at 3.44ppm and it is a C-H bond. This confirms the hypothesis because citronellol only has one of these groups and geraniol has two. The three methyl groups are shown at the peaks of 2.06ppm, 0.94ppm, and 0.83ppm. This does not confirm the hypothesis because geraniol also has three methyl groups in its molecule. The 1H NMR results sheet can be found on page three of the

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