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Molecular Complex Formation Between Phenylcarbamates and Chloranil
Veselovska, J.,Remko, M.,Cizmarik, J.,Remkova, L.,Novosedlikova, D.
, p. 1003 - 1008 (2007/10/02)
The interaction of a number of hydrochlorides of basic esters of substituted phenylcarbamic acid with chloranil has been studied.Ultraviolet spectrophotometric measurements of the charge-transfer complexes carried out in CH2Cl2 were used to determine the equilibrium constants, Kc.The values of Kc were found in the range of 0.81-1.86 dm3 mol-1.The results of the spectral analysis reveal the formation of one-to-one molecular complexes.From the temperature dependence of the equilibrium constants the values of ΔH0 and ΔS0 have been calculated.The enthalpy and entropy changes of the complexes were from the intervals of -9.4 - (-23.4) kJ mol-1 and -27.9 - (-79.6) J mol-1 K-1, respectively.
