Anion of hypericin is crucial to understanding the photosensitive features of the pigment.

[1]  Hong-yu Zhang,et al.  A TD-DFT study on triplet excited-state properties of curcumin and its implications in elucidating the photosensitizing mechanisms of the pigment , 2005 .

[2]  Monique M. Martin,et al.  Excitation energy effect on the early photophysics of hypericin in solution , 2005 .

[3]  L. Eriksson,et al.  Theoretical study of hypericin , 2005 .

[4]  J. Leprêtre,et al.  Reactivity of the photo excited forms of Hypericin, Hypocrellin A, Hypocrellin B and methylated Hypericin towards molecular oxygen: The role of charge transfer interaction , 2004 .

[5]  L. Eriksson,et al.  Theoretical study of phototoxic reactions of psoralens , 2003 .

[6]  Ioannis P. Gerothanassis,et al.  Towards a consensus structure of hypericin in solution: direct evidence for a single tautomer and different ionization states in protic and nonprotic solvents by the use of variable temperature gradient 1H NMR , 2002 .

[7]  Hong-yu Zhang,et al.  Intramolecular H-bonding in the bay region of hypericin: An AM1 study , 2001 .

[8]  S. Carpenter,et al.  Tumor Cell Toxicity of Hypericin and Related Analogs¶ , 2001 .

[9]  Y. Mazur,et al.  The Structure of Hypericin in Solution. Searching for Hypericin's 1,6 Tautomer¶ , 2001, Photochemistry and photobiology.

[10]  G. Vogel.  How the Body's 'Garbage Disposal' May Inactivate Drugs , 2001, Science.

[11]  J. Petrich.  Excited-state intramolecular H-atom transfer in nearly symmetrical perylene quinones: Hypericin, hypocrellin, and their analogues , 2000 .

[12]  Hong-yu Zhang,et al.  Mechanism for intramolecular proton transfer involving hypericin , 2000 .

[13]  Falk,et al.  From the Photosensitizer Hypericin to the Photoreceptor Stentorin- The Chemistry of Phenanthroperylene Quinones. , 1999, Angewandte Chemie.

[14]  G. Scuseria,et al.  An efficient implementation of time-dependent density-functional theory for the calculation of excitation energies of large molecules , 1998 .

[15]  B. Ehrenberg,et al.  Kinetics and Yield of Singlet Oxygen Photosensitized by Hypericin in Organic and Biological Media , 1998, Photochemistry and photobiology.

[16]  J. Galaup,et al.  Analysis of the site selected fluorescence and the phosphorescence spectrum of hypericin in ethanol , 1997 .

[17]  J. Tomasi,et al.  Ab initio study of solvated molecules: A new implementation of the polarizable continuum model , 1996 .

[18]  S. Carpenter,et al.  Research at the Interface between Chemistry and Virology: Development of a Molecular Flashlight. , 1996, Chemical reviews.

[19]  Z. Diwu.  NOVEL THERAPEUTIC AND DIAGNOSTIC APPLICATIONS OF HYPOCRELLINS AND HYPERICINS , 1995, Photochemistry and photobiology.

[20]  D. Meruelo,et al.  The chemical and biological properties of hypericin—a compound with a broad spectrum of biological activities , 1995, Medicinal research reviews.

[21]  F. Frolow,et al.  Acidic properties of hypericin and its octahydroxy analogue in the ground and excited states , 1994 .

[22]  H. Falk,et al.  Lowest excited triplet states of hypericin and isohypericin. , 1993, Journal of photochemistry and photobiology. B, Biology.

[23]  J. Hudson,et al.  The importance of light in the anti-HIV effect of hypericin. , 1993, Antiviral research.

[24]  A. Becke.  A New Mixing of Hartree-Fock and Local Density-Functional Theories , 1993 .

[25]  Y. Mazur,et al.  EPR studies of hypericin. Photogeneration of free radicals and superoxide , 1992 .

[26]  D. Weiner,et al.  Studies of the mechanisms of action of the antiretroviral agents hypericin and pseudohypericin. , 1989, Proceedings of the National Academy of Sciences of the United States of America.

[27]  Parr,et al.  Development of the Colle-Salvetti correlation-energy formula into a functional of the electron density. , 1988, Physical review. B, Condensed matter.

[28]  P. Song,et al.  HYPERICIN AND ITS PHOTODYNAMIC ACTION , 1986, Photochemistry and photobiology.

[29]  G. Britton.  The Biochemistry of Natural Pigments , 1983 .

[30]  Jacopo Tomasi,et al.  Approximate evaluations of the electrostatic free energy and internal energy changes in solution processes , 1982 .

[31]  J. Tomasi,et al.  Electrostatic interaction of a solute with a continuum. A direct utilizaion of AB initio molecular potentials for the prevision of solvent effects , 1981 .

[32]  Fritz Haber,et al.  The catalytic decomposition of hydrogen peroxide by iron salts , 1934 .

[33]  H. Fenton,et al.  LXXIII.—Oxidation of tartaric acid in presence of iron , 1894 .