Photochem - David Grauer November 30, 2007 CHM 371...

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David Grauer November 30, 2007 CHM 371 Photochemistry Synthesis and Characterization of the excited states of an Iridium Luminophore Pre-Lab: Please refer to lab notebook pages 7-9 for synthesis procedure. The following photophysical measurements were taken: UV-Vis Emission Excitation Lifetime These measurements were taken to test two parameters. First, the concentration of an ionic salt, LiF 3 CSO 3 , was varied from 10µM to 10,000µM. Second, a quencher (anisole) was added and its concentration was varied from .01M to .9M. During each of these variations, all photophysical measurements were taken. In addition to these parameters, other groups tested different parameter and quenchers. Our quenching study, as noted above, tested the quenching ability of anisole’s electron pairs on its methoxy group. It was found to have minimal activity, as the following data will indicate. Data Collection and Analysis: Synthesis : Please refer to notebook for observations. Yield:
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UV-Vis: (note: this is lab group A MW data) 10 µM 15 µM 20 µM 25 µM Peak Abs. Peak Abs. Peak Abs. Peak Abs. 190 .08 190 .39 190 .7 190 1.2 200 .32 200 .5 200 .69 200 .85 250 .475 250 .65 250 .85 250 1.25 270 .275 270 .35 270 .45 270 .45 390 .1 390 .1 390 .1 390 .1 UV-Vis -0.200 0.000 0.200 0.400 0.600 0.800 1.000 1.200 0 200 400 600 800 1000 1200 nm 10  M 15  M 20  M 25  M Emission: Blank 10K µM 1K µM 1C µM P (nm) FWHM P (nm) FWHM P(nm) FWHM P (nm) FWHM 600 100(nm) 600 105(nm) 600 110(nm) 600 110(nm) 675 Sh 675 Sh 675 Sh 675 Sh Emission 0 200000 400000 600000 800000 1000000 1200000 0 200 400 600 800 1000 Blank 10k  M 1k  M 1c  M
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Excitation : Blank 10k µM 1k µM 1c µM Peak (nm) Peak (nm) Peak (nm) Peak (nm) 265 265 265 265 280 280 280 280 300 300 300 300 370 370 370 370 420 420 420 420 Excitation 0 5000000 10000000 15000000 20000000 25000000 30000000 35000000 250 300 350 400 450 500 550 Blank 10k  M 1k  M 1c  M Lifetime: We tested the effect of an ionic salt, LiF 3 CSO 3 , at varying concentrations on the lifetime of our Iridium complex, Ir(Ppy) 4 PF 6 . We expected that the salt would lengthen the lifetime by providing ionic stability for the complex in solution. This would lower the energy because, during the excited state, the complex’s dipole moment has increased as the electron has been excited to the ligands. The data below shows that while the salt concentration has little effect on the lifetime, the presence of the salt does indeed lengthen the Ir(Ppy) 4 PF 6 ’s lifetime by ~70 ns. The fact that concentration has no bearing
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This lab report was uploaded on 02/09/2008 for the course CHM 371 taught by Professor Andrewb.bocarsly,istvanpelczer,prasads.lakkaraju during the Fall '07 term at Princeton.

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Photochem - David Grauer November 30, 2007 CHM 371...

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