Download Advances in Photochemistry, Volume 29 by Douglas C. Neckers, William S. Jenks, Thomas Wolff PDF

By Douglas C. Neckers, William S. Jenks, Thomas Wolff

ISBN-10: 0471682403

ISBN-13: 9780471682400

The magazine of the yank Chemical Society says this reference presents “a wealth of data on frontier photochemistry” and “could simply function a definitive resource of historical past info for destiny researchers."? This quantity positive aspects serious reviews written through well-known specialists and covers state-of-the-art advances. not easy and provocative, the articles set the speed for development and innovation in photochemistry.

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Additional info for Advances in Photochemistry, Volume 29

Sample text

The efficiency as a function of relative distance, E, is E¼ R60 R60 þ r 6 ð4Þ Information about the rate constant of hopping (khopp) through excitation energy transfer can be derived from the fast anisotropy decay time (Â2). In order to take into account the possibility of multiple energy transfer channels in the case of a multichromophoric system containing identical chromophores, among which efficient dipole–dipole interactions occur, the measured anisotropy decay time Â2 can be related to khopp by Eq.

J. Fre´chet, Angew. Chem. Int. Ed. 1999, 38, 1422. (b) A. Adronov, S. L. Gilat, J. M. J. Fre´chet, K. Ohta, F. V. R. Neuwahl, and G. R. Fleming, J. Am. Chem. Soc. 2000, 122, 1175.

On the basis of Eq. (6), a value of around 4:6 nsÀ1 is obtained for khopp of p-C1P3 and p-C1P4. 2 nm larger in the para series. In fact, by employing the excited state lifetime tD ¼ 4 ns, the above derived values of R0 ¼ 3:8 nm, and khopp, the calculation of the distance between two chromophores by Eq. (6) yields too small values of dDA. 8 nm from molecular modeling structures. The only reason for this large discrepancy can be the wrongly estimated value of R0 due to the too simplified assumption of the dipole–dipole orientation factor k2 value of 2/3, which is strictly valid only for a random orientation of the chromophores.

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Advances in Photochemistry, Volume 29 by Douglas C. Neckers, William S. Jenks, Thomas Wolff

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