Journal
CHEMPHYSCHEM
Volume 12, Issue 16, Pages 2959-2972Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/cphc.201100522
Keywords
calorimetry; computational chemistry; ionic liquids; melting point; thermodynamics
Funding
- Universitat Freiburg
- DFG [SPP 1191]
- Deutsche Bundesstiftung Umwelt
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An investigation of the melting points of 520 organic 1:1 salts is presented with the aim of developing a universal, simple, physically well-founded prediction scheme. The general reliability and reproducibility of the recorded experimental data are discussed with respect to purity, phase behavior, disorder and thermal history of a given substance. Additionally, mistakes, systematic errors, or lack of conventions can lead to considerable differences in the experimental measurements. A rough error bar for the reproducibility of the melting points of organic salts of +/- 5 to +/- 15?degrees C can be assigned. With this restraint, we developed two simple, semiempirical, five- and nine-parameter schemes with easy-to-calculate quantities. With these, we could predict the melting temperature of a given organic salt in the temperature range of -25 to +300?degrees C with an average error of 33.5?degrees C and a relative error of 9.3?%. All calculated quantities are assessed with the help of conventional DFT, COSMO and COSMO-RS calculations, and are currently implemented into the IL-Prop module of the upcoming version of COSMOtherm. These prediction schemes are suitable for high-throughput computational screening of substances in the context of computer-aided synthesis. Therefore, they are valuable tools to find a compound with a suitable melting point before its first synthesis.
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