2. (a) Consider the structure of compound 1 and the spectroscopic data given below. REDRAW compound 1 and assign ALL the spectroscopic data given DIRECTLY ON the molecule you have redrawn:
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- A compound with empirical formula Fe2(C5H5)2(CO)4 exhibits carbonyl stretching frequencies at 1780 and 2000 cm³¹. Draw the structure of the compound and assign the v(CO) stretches in the structure.An ethanol solution of 3.5 mg/100 ml of compound Y (150.0 g/mol) in a 1.00 cm quartz cell has an extinction coefficient (ɛ) of 23,150 at Amax=235 nm. What is the expected absorption (A)? Report your answer to the correct number of significant figures.,Mesityl oxide( (CH3)2C=CHCOCH3) shows two bands at 230 nm (12600) and 327 nm (98). But its isomer, ( CH2=C(CH)3-CH2COCH3) does not show any bands above 210 nm. Explain.
- A 400 MHz 'H NMR spectrum of a mixture of common organic solvents consisting of benzene (C,H6) 8 7.37; diethyl ether (C4H,1,0) § 3.49 and 8 1.22; and dichloromethane (CH;Clz) 8 5.30 is given below. Estimate the relative proportions (mole %) of the 3 components from the integrals in the spectrum. CH3-CH2-0- CH2-CH3 CI-CH2-CI benzene diethyl ether dichloromethane 'H NMR Spectrum (400 MHz, CDCI, solution) 3.5 3.4 ppm 1.3 1.2 ppm 7 5 3 2 1 ppm Compound Mole % benzene diethyl ether dichoromethaneA 400 MHz 'H NMR spectrum of a mixture of common organic solvents consisting of benzene (CHs) 8 7.37; diethyl ether (C4H100) 8 3.49 and 8 1.22; and dichloromethane (CH;Cl2) 8 5.30 is given below. Estimate the relative proportions (mole %) of the 3 components from the integrals in the spectrum. CH3-CH2-0-CH2-CH3 Cl-CH2-CI benzene diethyl ether dichloromethane 'H NMR Spectrum (400 MHz, CDCl, solution) 3.5 3.4 ppm 1.3 12 ppm 8 ppm Compound Mole % benzene diethyl ether dichloromethane(b) Molecule X undergoes the photophysical processes listed below. Name each process (1) - (5) and represent them on a Jablonski diagram. So +hv → S, (1) S >S, +hv (2) S, – >T; + A (3) T →S, +hv (4) k4 T,- > S, + A (5)
- C8H8O produces an IR spectrum with 3063, 1686, 1646 cm signals. HNMR is a singlet at 2.6ppm (3H), and multiplet at 7.5 (5H). What is the productThe volatile organic compounds (VOCs) produced by decomposing tissue and organs were studied in an effort to identify possib human-specific markers (PLoS ONE 2015 10(9): e0137341.). Of 452 VOCs isolated, six were found to be unique to humans, so th prove to be a useful tool for forensic chemists trying to determine the source of unidentified remains. There are two doublets in expected ¹H NMR spectrum of the following human-specific VOC. Identify the protons giving rise to each doublet. 1 2 H3C H3C- оооооооо 238 H 8 HH HH 3 HH CH3 5 7 Identify the two groups of protons that give rise to the doublets in the spectrum. CH3 8The infrared absorption spectrum of 12C14N has its strongest band at 2500 cm-1 wavenumber. Calculate the force constant (N/m) of the bond in this molecule.
- P11E.2 Suppose that three conformations are proposed for the nonlinear molecule H,O, (1, 2, and 3). The infrared absorption spectrum of gaseous H,O, has bands at 870, 1370, 2869, and 3417 cm. The Raman spectrum of the same sample has bands at 877, 1408, 1435, and 3407 cm. All bands correspond to fundamental vibrational wavenumbers and you may assume that: (a) the 870 and 877 cm bands arise from the same normal mode, and (b) the 3417 and 3407 cm bands arise from the same normal mode. (i) If H,O, were linear, how many normal modes of vibration would it have? (ii) Give the symmetry point group of each of the three proposed conformations of nonlinear H,O,. (iii) Determine which of the proposed conformations is inconsistent with the spectroscopic data. Explain your reasoning. 2Ineachofthe following parts, a molecularformula is given. Try to deduce thestructurethat isconsistent with the infrared spectrum. There may be more than one possible answer. a. C3H5O2CI (Hint: chloride located at the a-position) MICRONS 1002,5 5 6 10 11 12 13 14 15 16 19 90 80 70 60 50 40 30 CaH,O2GI 20 1728 cm 1 10 1400 WAVENUMBERS (CM-') 4000 3600 3200 2800 2400 2000 1800 1600 1200 1000 800 600 400 % TRANSMITTANCEa.) The spacings of the rotational fine structure lines of carbon dioxide 12C16O2 are determined from IR spectroscopy to be 0.7604 cm-1. Calculate the C=O bond length of the molecule (given masses: m(12C) = 12 amu, m(16O) = 15.9949 amu). Ans = ________ Angstroms b.) A molecule in a gas undergoes 3e+09 collisions in each second. Suppose that(i) every collision is effective in deactivating the molecule rotationally. Calculate the linewidth of rotational transitions in the molecule. Ans = _________ MHz(ii) Suppose that 1 collisions in 10 are effective. Ans = _______ MHz