Stability and molecular and crystal structure of 9-amino-10-methylacridinium triiodide

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• 作者：M. S. Chernovyants (1)
  I. V. Burykin (1)
  Yu. A. Kirsanova (1)
  I. E. Tolpygin (2)
• 刊名：Russian Journal of Inorganic Chemistry
• 出版时间：September 2007
• 出版年：2007
• 期刊代码：pc382_0036-0236
• 类别：ch
• 卷：52
• 期：9
• 页码：1378-1383
• 数据来源：sp

摘要

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 脜) 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.