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Spectroscopic Studies of charge-transfer Complexation of Octathia-24-crown-8 with Iodine in Chloroform Solution

Shamsipur M., Samadi N., Irandoust M.

Polish Journal of Chemistry

2004

Vol.78 /nr 11-12

1979-1986

The charge-transfer complexation between octathia-24-crown-8 (OT24C8) and iodine in chloroform solution was studied spectrometrically at various temperatures. The molar absorptivities and formation constants of the resulting 1:1 complex were determined. The formation of the OT24C8-I2 complex was also confirmed by 1H NMR spectrometry. The enthalpy and entropy of the charge-transfer complexation were determined from the temperature dependence of the formation constant, as Delta H graduate = -31.0 + - 0.5 kJ mol-1 and Delta S graduate = -84 + - 6 J mol-1K-1.