Studies of partial molar volumes of alkylamine in non-electrolyte solvents III: Alkyl amines in butanols at 303.15 K

Apparent molar volumes V-phi,V-B of n-propylamine, n-butylamine, di-n-propylamine, di-n-butylamine. triethylamine, tri-n-propylamine, and tri-n-butylamine in 1-butanol and 2-butanol at 303.15 K have been determined with high precision vibrating tube Anton Paar densimeter (model DMA 60/602). From these data limiting partial molar volumes V-B(infinity) and limiting excess partial molar volumes (V) over bar(B)(E,infinity) were estimated. The results are analysed and interpreted in terms of solute-solvent interactions and structural effects of the molecules. An attempt to find a measure of the contribution of the specific interactions to the partial molar volumes of primary, secondary and tertiary amines in 1-butanol and 2-butanol was made using Terasawa model, hard-sphere theory (HST) and scaled particle theory (SPT). The ERAS model has also been applied to estimate apparent molar volumes, and excess apparent molar volumes of alkylamine solutions in 1-butanol and 2-butanol. The results agree well in the different approaches used. (C) 2008 Elsevier B.V. All rights reserved.