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J. Park, A. Datta, P. K. Chowdhury, and J. W. Petrich, Photochem. Photobiol. 2001, 73, 105. B. M. Showalter, A. Datta, P. K. Chowdhury, J. Park, P. Bandyopadhyay, P. K. Choudhury, S. Kesavan, Y. Zeng, G. A. Kraus, M. S. Gordon, J. P. Toscano, and J. W. Petrich, Photochem. Photobiol. 2001, 74, 157. L. Zhu, P. Li, M. Huang, J. T. Sage, and P. M. Champion, Phys. Rev. Lett. 1994, 72, 301. M. H. Vos, J. C. Lambry, S. J. Robles, D. C. Youvan, J. Breton, and J. L. Martin, Proc. Natl. Acad. Sci. USA 1991, 88, 8885.

Sarno, W. Merlevede, and P. deWitte, Biochem. Biophys. Res. Commun. 1996, 220, 613. 24 HYPERICIN AND ITS PERYLENE QUINONE ANALOGS 16. A. L. Vandenbogaerde and P. A. deWitte, Phytother. Res. 1996, 10, S150. 17. A. L. Vandenbogaerde, J. F. Cuveele, P. Proot, B. E. Himpens, W. J. Merlevede, and P. A. deWitte, J. Photochem. Photobiol. B Biol. 1997, 38, 136. 18. A. Mirossay, L. Mirossay, J. Tothova, P. Miskovsky, H. Onderkova, and J. Mojzis, Phytomedicine 1999, 6, 311. 19. L. Mirossay, A. Mirossay, E.

In order of increasing energy, the outermost orbitals associated only with the CÀ ÀS chromophore are (s), (n0 ), (p), (n), (p*), and (s*), where n is the thiocarbonyl nonbonding orbital, and n0 a second nonbonding orbital, (chlorine orbitals are excluded). The electronic configuration of the ground state can be written (s)2(n0 )2(p)2(n)2(p*)0(s*)0, where each of the inner orbitals are doubly occupied by an electron pair and the outer orbitals (virtual) are empty. 2. The p, n, p*, and s* molecular orbitals that create the X 1 1 1 ~ ~ A2(n,p*), B A1(p,p*), and C B2(n,s*) states along with the first three low-energy singlet-singlet transitions.

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