The Growth of Single Crystals of the Charge Transfer Complexes.
Final rept. 1 Aug 67-31 Jul 70,
AMERICAN SCIENCE AND ENGINEERING INC CAMBRIDGE MASS
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Conditions for the single crystal preparation of the perylene-iodine charge transfer compounds and the nitro-derivatives of fluoren - Delta9 alpha - malononitrile have been investigated. Ternary phase relationships for the perylene-iodine carbon disulfide system have been obtained at 25C and 35C. The solubility curves for 9 - dicyanomethylene - 2,4,7-trinitrofluorene and 9 - dicyanomethylene-2,7-dinitrofluorene in acetonitrile have been determined and the conditions for crystal growth of these materials are presented. The free energies of formation, heats of formation and entropies of formation have been deduced from the solubility data and previous gas-solid reaction studies. The factors which hinder the crystal growth of the perylene-iodine compounds have been identified as extremely small solubilities coupled with large changes of the solubility with temperature. Results from the program indicate that the solution growth of good single crystals of both the perylene-iodine compounds and the nitro-derivatives of fluorene-delta9 alpha - malon onitride will require extremely close control of solution temperatures and temperature-gradients and use of growth solutions of six liters or more in size. Author
- Organic Chemistry