Abstract
The volume change on mixing (VE) of binary systems of methanol (1) +n-butylamine, isobutylamine, sec. butylamine and tert. butylamine (2) were determined at 25‡ C by density method. All the four systems showed a large negative volume change on mixing and the maxima were observed nearly at 0.5 mole fraction. This was attributed to the possibility of 1 : 1 type of complex formation between amine and methanol. TheVE was found to depend on the structure of butylamine and the magnitude ofVE increased as tert.-BuNH2 > sec.-BuNH2 > iso-BuNH2 >n-BuNH2 This particular trend is attributed to increase in the number of amine-alcohol species formed on the mixing and the geometric fitting of methanol in the liquid structure of the butylamine.
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