Thermodynamic properties of organic compounds in aqueous solutions. Apparent molal heat capacities of amines and ethers
- 1 January 1973
- journal article
- research article
- Published by Royal Society of Chemistry (RSC) in Journal of the Chemical Society, Faraday Transactions 1: Physical Chemistry in Condensed Phases
- Vol. 69, 2112-2123
- https://doi.org/10.1039/f19736902112
Abstract
Apparent molal heat capacities ΦC p of some cyclic monoethers and diethers as well as of open and cyclic secondary and tertiary amines and their chloride salts have been determined by adiabatic calorimetry in the temperature range 20–60°C, at concentrations 0.4–1.0 mol kg–1. In monofunctional compounds the contribution to ΦCp from the functional group is similar to the contribution of this group to Cp2 of the pure liquid; on the other hand the contribution to ΦCp from the methylene group is greatly enhanced with respect to the contribution to Cp2(≃ 6 cal (mol CH2)–1°C–1), ranging from 22 ± 2 for open chain compounds to 18 ± 2 cal (mol CH2)–1°C–1 for cyclic compounds. The introduction of a second polar centre brings about a large decrease in ΦCp values. Comparisons are made between ΦCp data and other thermodynamic quantities. Data are finally discussed in terms of water-hydrocarbon and water-polar centre interactions.Keywords
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