By Douglas C. Neckers, William S. Jenks, Thomas Wolff
The magazine of the yank Chemical Society says this reference presents “a wealth of knowledge on frontier photochemistry” and “could simply function a definitive resource of history info for destiny researchers."? This quantity gains serious reviews written via well-known specialists and covers state-of-the-art advances. hard and provocative, the articles set the velocity for development and innovation in photochemistry.
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Extra resources for Advances in Photochemistry, Volume 29
7 for k2 and khopp the distance between the two chromophores have been calculated from Eq. (6). This yields a value of d ¼ 3:7 nm, which is in good agreement with the average interchromophoric distance obtained from molecular modeling. 7 nm. 15, the multichromophoric second generation dendrimer is still inside the active sphere in which energy hopping can take place with high efﬁciencies. The decrease in hopping rate constant in these molecules thus scales with the sixth power of the distance difference as expected within the Fo¨rster model.
Chem. Res. 1998, 31, 26. (f) G. M. Stewart and M. A. Fox, J. Am. Chem. Soc. 1996, 118, 4354. (g) R. Gronheid, J. Hofkens, F. Ko¨hn, T. Weil, E. Reuther, K. Mu¨llen, and F. C. De Schryver, J. Am. Chem. Soc. 2002, 124, 2418. (h) T. Weil, E. Reuther, and K. Mu¨llen, Angew. Chem. Int. Ed. 2002, 41, 1900. (a) Z. Xu and J. S. Moore, Acta Polym. 1994, 45, 83. (b) J. S. Melinger, Y. Pan, V. D. Kleiman, Z. Peng, B. L. Davis, D. McMorrow, and M. Lu, J. Am. Chem. Soc. 2002, 124, 12002. -H. Xu, J. -S. Hu, and L.
2 ns. VI. FEMTOSECOND TRANSIENT ABSORPTION MEASUREMENTS So far, the photophysical properties of the dendrimers were investigated using the ﬂuorescence signal either by single-photon timing (SPT) or ﬂuorescence upconversion. Transient absorption is used to validate the presence of the annihilation process, to allow quantifying the spectral overlap between emission and absorption of the S1 state, the basis of singlet–singlet annihilation, and to evaluate the inﬂuence of the substitution pattern and the number of PI chromophores on the transient absorption properties of these dendrimers .