PHOTOSYNTHETIC PIGMENTS1.60.7QyD1.40.61.2 ESoret0.5-1AN-0.40.8H.H0.3COOCH30.6phytyl bacteriochlorophyll a0.2-0.4Qx0.10.2300400500600700800700 750 800 850 9002 (nm)2 (nm)Figure 4.7 Absorption (left) and fluorescence (right) spectra of bacteriochlorophyll a in diethyl ether.AbsorbanceBCFluorescence (Arbitrary units) 6. Here we have the molecular orbital energy diagram for this chlorophyll molecule. Matchthe absorption peaks labeled in Figure 4.7 above with the transitions shown in themolecular orbital energy diagram.LUMO+1LUMOHOMOНОМО-1

Higher the wavelength shorter will be the energy gap between the two energy levels

PHOTOSYNTHETIC PIGMENTS 1.6 0.7 1.4 0.6 1.2E Soret 0.5 HA 0.4 0.8 COOCH 0.3 0.6 phytyl bacteriochlorophyll a 0.2- 0.4 Qx 0.1 0.2 0. 300 400 500 600 700 800 700 750 800 850 900 2 (nm) 2 (nm) Figure 4.7 Absorption (left) and fluorescence (right) spectra of bacteriochlorophyll a in diethyl ether. Absorbance C Fluorescence (Arbitrary units)

PHOTOSYNTHETIC PIGMENTS 1.6 0.7 1.4 0.6 1.2E Soret 0.5 HA 0.4 0.8 COOCH 0.3 0.6 phytyl bacteriochlorophyll a 0.2- 0.4 Qx 0.1 0.2 0. 300 400 500 600 700 800 700 750 800 850 900 2 (nm) 2 (nm) Figure 4.7 Absorption (left) and fluorescence (right) spectra of bacteriochlorophyll a in diethyl ether. Absorbance C Fluorescence (Arbitrary units)

Organic Chemistry

9th Edition

ISBN:9781305080485

Author:John E. McMurry

Publisher:John E. McMurry

Chapter30: Orbitals And Organic Chemistry: Pericyclic Reactions

Section30.1: Molecular Orbitals Of Conjugated Pi Systems

Problem 1P

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List all the possible electronic transitions in the compounds below in order of increasing energy. Cyclopentene, Acetaldehyde, Dimethyl Ether, Methyl vinyl ether, Triethylamine, and Cyclohexane.
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5. Calculate the reduced mass for the two isotopomers (HCl and HCI). Which isotopomer do you expect to have a higher vibrational frequency ? (Recall = 20
We know how to determine the total number of vibrational modes for a molecule with a given number of atoms. If the stretching frequencies you identified are the only ones appearing in the diagnostic region, and each bond contributes one stretching mode, how many additional vibrational modes must be represented in the overlapping signals in the fingerprint region for each of these molecules?
Explain why this is the correct spectra for these molecules. Identify a specific absorption band which identifies each characteristic functional group of the chosen molecule.
Explain why these are the correct spectra for the molecules. Identify a specific absorption band which identifies each characteristic functional group of the molecule chosen.
An electron in the 7 orbital of ethylene (C,H,) is excited by a photon to the * orbital. Do you expect the equilib- rium bond length in the excited ethene molecule to be greater or less than that in ground-state ethene? Will the vibrational frequency in the excited state be higher or lower than in the ground state? Explain your reasoning.
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In comparing fluorescence spectroscopy to UV-Vis absorption spectroscopy, which of the statements is true? Fluorescence measurements are more precise and less noisy because only the intensity of the emitted light is measured. Fluorescence measurements do not suffer deviations from linearity like absorbance measurements do. Fluorescence measurements have better detection limits because at low concentrations a low intensity emission signal is being measured against a low intensity background signal. O Fluorescence instruments are less expensive than absorption measurements.
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(g) Which of the following compound gives the largest vibrational frequency among H2, D2,HD, and Cl2? A. HD B. D2 C. H2 D. Cl2