Absorption Spectrum of NaphthaleneTitle: Understanding the Absorption Spectrum of NaphthaleneGraph: Show a graph with labeled peaks indicating the absorption spectrum of naphthalene in a suitable solvent
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Absorption Spectrum of Naphthalene
Title: Understanding the Absorption Spectrum of Naphthalene
Graph: Show a graph with labeled peaks indicating the absorption spectrum of naphthalene in a suitable solvent
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- Analyze the IR spectra to determine the identity of the unknown solid organic compound. Identify the peaks in the spectra and show each functional group present in the organic compound. The list of all the possible organic compounds are as follows: Cumene, 3-Methy-2-butanone, Phenethyl alcohol, Isopropyl Acetate, Ethel benzoate, 3-phenylpropionaldehyde, isobutyl cinnamate, cyclamen aldehyde, Styrallyl acetate, Butyl butyrate, propiophenon, phenylacetylene, Cis-Hexenyl-3-Acetate, Benzyl propionate, 3-(p-ethyl-phenyl)-2,2-dimethyl propionaldehyde, 2-methoxy-4-ethyl-phenol, P-ethylphenol, diphenyl amine, 4-phenyl-3-buten-2-one, Diethyl Terphthalate, glutaric acid, cinnamic acid, P- ethylbenzoic acid, Coumarin, vanillin, (2,2,2-trichloro-1-phenylethyl)acetate, 4-(p-hydroxyphenyl)-2-butanone, 2-ethoxy-5-prop-1-enylphenol, t-butyl-phenol, Thymol, Calone, Syringol, Syringaldehyde. Borderline MP unknowns: Styrallyl alcohol, 1,1-dimethyl-2-phenethyl acetate, 1,1-dimethyl-2-phenyl ethanol.A common lab experiment is the dehydration of cyclohexanol to cyclohexene. Explain how you could tell from the IR spectrum whether your product was pure cyclohexene, pure cyclohexanol or a mixture of both. Give approximate frequencies for distinctive peaks.Organic Chemistry: IR spectroscopy A student obtains an IR spectrum with an intense, broad absorption at about 3350 cm-1. The student claims that the sample is an alcohol, but the professor says that the absorption is there because the sample is contaminated with water. What peak(s) could be looked for to show that the sample is indeed an alcohol? Which functional groups would make it difficult to use this strategy?
- S 1: 0 (absorbances) - 447.30 S 2: 0.127 (absorbances) - 447.30 S 3: 0.282 (absorbances) - 447.30 S 4: 0.432 (absorbances) - 447.30 S 5: 0.576 (absorbances) - 447.30 S 6: 0.710 (absorbances) - 447.30 Fill in the tables using the datayou see above6Explain why these are the correct spectra for the molecules. Identify a specific absorption band which identifies each characteristic functional group of the molecule chosen.
- Please explain how to use DEPT spectra.2) From here, the student wants to narrow down Unknown 1 and 2 even further. Fill in the table below to help identify the unknowns. Note: By visual inspection, Unknown 1 is a yellow solid and Unknown 2 is a white color. Compound Absorbance Frequency Absorbance Wavelength Absorbed Color Fluorene 300 nm Ultraviolet 7.14x1014 s-l 8.33x1014 s- 7.5x1014 s-l Fluorenone Fluorenol Ultraviolet 4-Nitrophenol Coumarin 280 nm a) Based on the table above and what you learned in Q1 what is the identity of Unknown 1? b) Based on the table above and what you learned in Q1 what is the identity of Unknown 2?When compounds are prepared for IR analysis, they usually have to be dehydrated completely and then dissolved in a solvent other than water. Can you think of a reason why you might not want to have any H2O mixed in with your unknown compound when collecting its IR absorbance? Explain your rationale with respect to any observations about the spectra.
- IR spectra OF SOLID UNKNOWN List all the important peaks that can be used to determine the functional groups present in your solid unknown in the table below. Peak Position cm-1 Peak Characteristics (weak, strong, sharp, broad etc...) Bond type(sp3 C-H, C=C, C-O, O-H, C=O etc...) Functional Group (alkyl, aromatic, aldehyde, alcohol etc...)The concentration of chemical solutions can be expressed in several different units of measurement (e.g. M, mM, mg/ml), and the same applies to a compound's extinction coefficient. Remember that absorbance has no units, so in the Beer-Lambert law, the units in the extinction coefficient need to cancel out those from concentration x pathlength. Pathlength is typically given in cm. You place a 4 mM solution of compound X into a 1.0 cm cuvette and measure an absorbance of 1.000. If you were to calculate an extinction coefficient of 2.5 x 10^2?, which units would you have been using? Note- two of the answers below are correct. i) uM-1cm-1 ii) M-1cm-1 iii) L/mol/cm iv) L/(mmol cm) v) L/umol/cm Assuming that compound X has a molecular weight of 370 g/mol, recalculate extinction coefficient of the solution in question (a) using each of these units: L/g/cm, ml/mg/cm, ml/ug/cmExplain why this is the correct spectra for these molecules. Identify a specific absorption band which identifies each characteristic functional group of the chosen molecule.
