Abstract
Excess molar volumes V E at 298.15 K and atmospheric pressure for 1-propanol and 1-hexanol + butyl methyl ether, + dipropyl ether or + dibutyl ether with a vibrating-tube densimeter. The V E are negative over the whole mole-fraction range and nearly have been calculated from densities measured symmetrical for all the systems investigated. For each monoether, the V E decreases as the chain length of the 1-alcohol increases. For each 1-alcohol, the V E increases as the chain length of the symmetrical di- n-alkyl ethers increases. Moreover, for the butyl methyl ether (an asymmetrical monoether), the V E is more positive than of the immediately higher symmetrical dipropyl ether. These results, together with previously published excess molar enthalpies H E, suggest the formation of hydrogen bonds between the functional group (OH) of the 1-alcohol and the (O) atoms of the monoethers.
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