Tin(II) iodide

Tin(II) iodide, also known as stannous iodide, is an ionic tin salt of iodine with the formula SnI2. It has a formula weight of 372.519 g/mol. It is a red to red-orange solid. Its melting point is 320 °C, and its boiling point is 714 °C.

References

  • Chemistry : Periodic Table : tin : compound data [tin (II) iodide]
  • Tin(IV) iodide

    Tin(IV) iodide, also known as stannic iodide, is the chemical compound with the formula SnI4. This tetrahedral molecule crystallises as a bright orange solid that dissolves readily in nonpolar solvents such as benzene.

    The compound is usually prepared by the reaction of iodine and tin:

    The compound hydrolyses in water. In aqueous hydroiodic acid, it reacts to form a rare example of a metal hexaiodide:

    See also

  • Tin(II) iodide
  • Tin(IV) chloride
  • References

  • Chemistry : Periodic Table : tin : compound data [tin (IV) iodide]
  • 1 2 Moeller, T., Edwards, D. C., Brandt, R. L. and Kleinberg, J. (1953). "Tin(IV) Iodide (Stannic Iodide)". Inorganic Syntheses. Inorganic Syntheses 4: 119–121. doi:10.1002/9780470132357.ch40. ISBN 978-0-470-13235-7.
  • Hickling, G. G. (1990). "Gravimetric analysis: The synthesis of tin iodide". J. Chem. Educ. 67 (8): 702–703. doi:10.1021/ed067p702.
  • SNi

    SNi or Substitution Nucleophilic internal stands for a specific but not often encountered nucleophilic aliphatic substitution reaction mechanism. The name was introduced by Cowdrey et al. in 1937 to label nucleophilic reactions which occur with retention of configuration, but later was employed to describe various reactions that proceed with similar mechanism.

    A typical representative organic reaction displaying this mechanism is the chlorination of alcohols with thionyl chloride, or the decomposition of alkyl chloroformates, the main feature is retention of stereochemical configuration. Some examples for this reaction were reported by Edward S. Lewis and Charles E. Boozer in 1952. Mechanistic and kinetic studies were reported few years later by various researchers.

    Thionyl chloride first reacts with the alcohol to form an alkyl chloro sulfite, actually forming an intimate ion pair. The second step is the concerted loss of a sulfur dioxide molecule and its replacement by the chloride, which was attached to the sulphite group. The difference between SN1 and SNi is actually that the ion pair is not completely dissociated, and therefore no real carbocation is formed, which else would lead to a racemisation.

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