It is shown that an interaction of the type of weak charge-transfer complex formation is respon-sible for the change of the UV absorption of diphenylamine and indole, in the solvents of chloroform, carbon tetrachloride, bromoform and carbon tetrabromide.
The following results are obtained from the spectrophotometric analysis by the Benesi-Hildebrand equation and the Contineous-Variation method.
1. Number of the formed complex of diplienylamine with carbon tetrachloride is one.
3. For the diphenylamine complex with carbon tetrachloride, the values of a molar extinction coefficient of (3.5±1.5)×10
4l/mole ·cm, an apparent equlibrium constant of (1.8±0.6)×10
-2l/mol (at22 °C), and a heat of formation of 2.9×10
3 cal/mole are calculated.
4. Approximately, the linear relation between each peak of the charge-transfer band in the solution of CCl
4 and each ionization potential of the composed amine is held.
5. It seems that the magnitude of electron affinity among four halomethanes becomes weaker in the order, carbon tetrabromide, bromorm, carbon tetrachloride, chloroform.
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