The excited singlet and triplet absorption spectra of hematoporphyrin diacetate are presented. Extinction coefficients in the spectral range 420-700 nm are estimated. Two possible mechanisms of step excitation are proposed. The maximal stepexcitation efficiency is achieved at 450 nm.
Fingerprints of Singlet and Triplet Phenyl Cations
โ Scribed by Micha Slegt; Hermen S. Overkleeft; Gerrit Lodder
- Publisher
- John Wiley and Sons
- Year
- 2007
- Tongue
- English
- Weight
- 255 KB
- Volume
- 2007
- Category
- Article
- ISSN
- 1434-193X
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โฆ Synopsis
Abstract
The photolyses of seven phenyl cation precursors in acetonitrile in the presence of anisole resulted in four distinct product patterns. These patterns are due to the chemoselective and regioselective chemistry of various phenyl cation isomers. This spinโselective chemistry provides a tool with which to fingerprint the singlet/triplet nature of any phenyl cation.(ยฉ WileyโVCH Verlag GmbH & Co. KGaA, 69451 Weinheim, Germany, 2007)
๐ SIMILAR VOLUMES
Borylene (BH), which is known to have a 'Z' ground state, is predicted to have a low-lying 'II triplet state with an energy separation of 31.9 kcal/mol. The ab initio molecular-orbital method used is shown to give results which are consistent with theoretical and experimental data on CH', CH? and NH
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