2,3,7,8-Tetramethoxythianthrene: A Novel Ground State Triplet Dication, The Neutral Photogenerated Triplet, and the Radical Cation.
Technical rept. 30 Sep 74-30 Jun 75,
ROCKWELL INTERNATIONAL CORP THOUSAND OAKS CALIF SCIENCE CENTER
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The dication of 2,3,7,8-tetramethoxythianthrene was studied in solid nitromethane at 77K by computer controlled electron spin resonance. The Delta m2 transition was observed, yielding a value of D 0.094cm. For comparison the value of D for thianthrene and 2,3,7,8-tetramethoxythianthrene photogenerated triplets determined. Lifetimes of these triplet states were also determined. Frozen solutions of the tetramethoxythianthrene dication exhibited a very broad Delta m1 signal that could not be resolved into components D and E of the dipolar tensor. The free energy separation between the triplet and singlet states is between 90 and 190cm. The esr spectrum of the cation was redetermined.
- Atomic and Molecular Physics and Spectroscopy