Abstract
Abstract A polarization study of the low-lying electronic states of the diphenylnitroxide radical imbedded in a benzophenone single crystal is presented. Assignments are made for the first two electronic excited states: 2 B 2 (n → π ∗ ) at 569 nm and 2 B 1 (π → π ∗ ) at 431 nm. Vibronic coupling is invoked in inducing the n → π ∗ transition. The electronic structure of the nitroxide bears some resemblance to the corresponding carbonyl. The delocalization of the π electrons is also discussed.
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