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|Title:||Solid-state reaction between p-benzoquinone and p-aminophenol|
|Authors:||Singh, N B|
|IPC Code:||Int. Cl7 . C07 50/04|
|Abstract:||Kinetics of solid-state reaction between p-benzoquinone and p-aminophenol has been studied at different temperatures. When the reactants are kept in contact in glass capillaries, the reaction rate increases with temperature and energy of activation is found to be much lower than the heat of sublimation of p-benzoquinone. It has been found that rate constants when the reactants are in contact and when they are separated by air gaps of different lengths are not the same. The results show that the diffusion of p-benzoquinone molecules towards p-aminophenol occurs via surface migration. Kinetics of reaction between p-benzoquinone (vapour) and p-aminophenol (solid) has also been studied by gravimetric method. The energy of activation determined by this method is found to be much higher than that for surface migration, indicating that the molecules of p-benzoquinone enter into the crystal lattice of p-aminophenol forming the reaction product in 1:1 molar ratio. Elemental analysis shows that stoichiometry of the reaction products obtained from solution and solidstate reaction is the same. UV-vis and infrared spectral studies indicate that the reaction product obtained from solution may be charge transfer complex stabilized by hydrogen bond. PMR, X-ray diffraction and DTA studies show that the reaction products obtained from the two different routes are different.|
|Appears in Collections:||IJC-A Vol.44A(04) [April 2005]|
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