Thermodynamics of Inclusion complexes in Water: β-Cyclodextrin– Alkyl halides Adducts at 303.15 and 313.15 K
DOI:
https://doi.org/10.48165/Keywords:
β -cyclodextrin, tetra ethyl ammonium bromide, Calorimetry, host–guest complex, enthalpy of mixing, hydrophobic cavityAbstract
The interaction in water of tetra ethyl ammonium bromide ((C2H5)4N(Br)), tetra propyl ammonium bromide ((CH3CH2CH2)4N(Br)) and tetrabutylammonium bromide ((CH3CH2CH2CH2)4N(Br)) with β –cyclodextrin (β -CD, cyclomaltose) (C42H70O35 ) for dilute solutions has been studied calorimetrically at the temperature 303.15 and 313.15 K. The values of enthalpy of mixing, Q, of two binary aqueous solutions of β -CD with alkyl halides at all temperatures have been fltted by the method of least squares to the equatlon Q = x1x2 [Ao + A1(x2 – x1) + A2(x2 – x1)2+ A3(x2 – x1)3], where x2 refers to the mole fraction of the alkyl halide. The results obtained have been interpreted in terms of host guest interaction.
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