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Fingerprints of Singlet and Triplet Phenyl Cations

โœ 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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โœฆ 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 spinโ€selective chemistry provides a tool with which to fingerprint the singlet/triplet nature of any phenyl cation.(ยฉ Wileyโ€VCH Verlag GmbH & Co. KGaA, 69451 Weinheim, Germany, 2007)


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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.

Singlet-triplet separation in borylene.
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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