Experiment 1: Ir Unknown/Spectroscopy Assignment Fourier Transform Infrared Spectroscopy

2725 words - 11 pages

Purpose: The purpose of this experiment is to practice the usage of infrared spectroscopy and to identify the unknown compound # 53 using Fourier-Transform Infrared Spectrometer. From the IR spectroscopy, specific functional group peaks are noted and used to aid the identification of the unknown organic compound. Furthermore, in this experiment, another unknown will be given and researched upon its spectral data.Main Reaction: There is not reaction carried out in this experiment.Table of Physical Properties: (This is for both Part I and Part II) Source: www.chemfinder.com and www.aist.go.jp/RIODB/SDBS/menu-e.html structure molar mass mp (°C) bp(°C) density (g/mL) Miscellaneous: concentration, solubility, safety hazardsBenzaldehyde 106.12g -26 179 1.045 *Almond smell*Yellow-orange color*<0.01g/100mL @ 19.5°C*Combustible & eye irritantIR Peaks:*2732 & 2814 (pair of small peaks: aldehyde C-H)*1709 (strong C=O)t-Butylbenzene 134.22g -58 169 0.867 *Colorless Liquid*0.03g/L @ 20°C*FlammableIR Peaks:*1497 (Strong: C=C aromatic bond)*2967 (Strong: aromatic C-H bond)Part I.Unknown #53Preparation: Before collecting any data, the selected unknown sample was observed in its color and smell. Then, the Fourier-Transform Infrared Spectrometer detector was cleaned with CH2Cl2 and wiped dry. Then a background IR was taken to aid the clarity of sample IR. The background IR was not added to window to prevent overlapping of the actual sample IR and the air IR. Around 1 drop of unknown liquid sample was then placed on the detector using a capillary tube and taken its IR. After the IR graph was obtained, the peaks were assigned and labeled using a threshold line as the boundary.Observed Characteristic: - Yellow-orange color - Almond-like odorSpecific Functional Group Observed Frequency Vibration (cm-) Intensity ShapeAldehyde C-H 2815.92 & 2735.25 Medium Weak narrow broad peaksAromatic C=C 1455.24 & 1583.05 & 1595.87 Medium Sharp peaksAromatic C-H 3062.31 Weak Small peaksCarbonyl Group 1694.56 Strong Sharp peakDiscussion: From a list of alcohols, phenols, ketones, aldehydes, hydrocarbons, ethers, esters, and amines, an unknown was selected and taken its IR spectrum. From the IR spectrum for unknown #53, a strong carbonyl peak (1694.56cm-1) was first noted to rule out hydrocarbon possibilities. Secondly, no broad -OH peaks were observed, which further rules out alcohol and phenol. Two adjacent peaks at 2735.25cm-1 and 2815.92cm-1 indicated aldehydic C-H bond which aid narrowing the possibilities down to three: benzaldehyde, valeraldehyde, and isopropyl-benzaldehyde. Additional peaks around the range of 1450-1600cm-1 symbolized the presence of a benzene...

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