The enthalpies of dissolution of an alkaloid cytisine at dilutions [mole of cytisine : moles of water; mole of cytisine : moles of 96% ethanol] equal to 1 : 9000, 1 : 18 000, and 1 : 36 000 were measured by means of calorimetry. The experimental data obtained were used to calculate the standard enthalpies of dissolution of cytisine in infinitely diluted (standard) aqueous and ethanolic solutions. The enthalpies of combustion, melting, and crystallization of cytisine were calculated. The method of dynamic calorimetry in the temperature range 198–298.15 K was applied to study the specific heat of the alkaloid, and an equation describing the dependence C p o ∼ f(T) was derived.
Russian Journal of Applied Chemistry – Springer Journals
Published: Mar 22, 2005
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