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)

Principles of Modern Chemistry

8th Edition

ISBN:9781305079113

Author:David W. Oxtoby, H. Pat Gillis, Laurie J. Butler

Publisher:David W. Oxtoby, H. Pat Gillis, Laurie J. Butler

Chapter20: Molecular Spectroscopy And Photochemistry

Section: Chapter Questions

Problem 65AP

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