Stability and molecular and crystal structure of 9-amino-10-methylacridinium triiodide |
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Authors: | M S Chernovyants I V Burykin Yu A Kirsanova I E Tolpygin |
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Institution: | (1) Rostov State University, pr. Stachki 194, Rostov-on-Don, 344104, Russia;(2) Southern Scientific Center, Russian Academy of Sciences, pr. Chekhova 41, Rostov-on-Don, 344006, Russia |
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Abstract: | Mixing of equimolar amounts of 9-amino-10-methylacridinium iodide and elemental iodine yields 9-amino-10-methylacridinium triiodide. The complexation in the organic cation iodide-elemental iodine system has been studied by spectrophotometry. The composition and the stability constant of the complex formed in a chloroform solution have been determined. The compound C14H13N2]+I3]? has been isolated as dark red plate crystals and studied by X-ray diffraction. The structure is formed by linear I 3 ? anions and 9-amino-10-methylacridinium cations assembled through π-π stacking. The cations in the stacks are shifted by approximately one ring with respect to one another. The triiodide ion is linear, the average I-I bond length (2.915 Å) is close to the standard value. The stacking reflects the specific nature of the organic cation, while the presence of the I 3 ? counterion results in extension of the system of hydrogen bonds. |
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