James S. Chickos
University of Missouri–St. Louis
Analytical chemistryGas chromatographyEnthalpy of fusionEnthalpy of atomizationStandard enthalpy of formationComputational chemistryPhysical chemistryFusionThermal decompositionOrganic chemistryChemistryEnthalpy of sublimationVapor pressureVaporizationHydrocarbonEnthalpyDifferential scanning calorimetryChromatographySublimation (phase transition)Enthalpy of vaporizationThermodynamics
202Publications
35H-index
5,736Citations
Publications 193
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#1James S. Chickos (UMSL: University of Missouri–St. Louis)H-Index: 35
The vaporization enthalpy, and vapor pressure as a function of temperature of N-ethylamphetamine, a substance used in the 1950s as an appetite suppressant and more currently abused as a designer drug, is reported. Its physical properties are compared to those of S (+)-N-methamphetamine, a substance whose physiological properties it mimics. A vaporization enthalpy of (62.4 ± 4.4) kJ·mol-1 and vapor pressure of (19 ± 11) Pa at T = 298.15 K has been evaluated by correlation gas chromatography. Resu...
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#1Megan Orf (UMSL: University of Missouri–St. Louis)H-Index: 1
#2Manu Kurian (UMSL: University of Missouri–St. Louis)H-Index: 1
Last. James S. Chickos (UMSL: University of Missouri–St. Louis)H-Index: 35
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#1Dustin Barton (UMSL: University of Missouri–St. Louis)H-Index: 1
#2James S. Chickos (UMSL: University of Missouri–St. Louis)H-Index: 35
The vapor pressures and vaporization enthalpies of the major components of opopanax oil, a medicinal that has been in use since biblical times, are evaluated by correlation gas chromatography. Two sets of hydrocarbon standards are used, n-alkanes and a mixture of cyclic and polycyclic hydrocarbons. Two of the oil’s sesquiterpene components, evaluated in a previous study, were used both as standards and also as targets. Their use as targets was in an effort to confirm both their identity in the o...
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#1Dustin Barton (UMSL: University of Missouri–St. Louis)H-Index: 1
#2James S. Chickos (UMSL: University of Missouri–St. Louis)H-Index: 35
Abstract The vaporization enthalpies and vapor pressures of (-) β-elemene and (-) β-bisabolene are evaluated by correlation gas chromatography using two sets of standards, a mixture of various cyclic hydrocarbons and a series of n-alkanes. Both compounds are sesquiterpenes found in a variety of plants. β-Elemene has been used in China for the treatment of a variety of cancers. β-Bisabolene is used as a flavoring agent and it has also been shown to exhibit cytotoxicity in breast cancer cell lines...
2 CitationsSource
#1Christian Fischer-Lodike (UMSL: University of Missouri–St. Louis)H-Index: 1
#2Ameera Zafar (UMSL: University of Missouri–St. Louis)H-Index: 2
Last. James S. Chickos (UMSL: University of Missouri–St. Louis)H-Index: 35
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Abstract The vapor pressure and vaporization enthalpy of pristane and phytane, two compounds of interest to paleobotanists investigating the antiquity of life, have been evaluated and compared to existing values by correlation gas chromatography. Vapor pressures have been evaluated from T = (298.15–550) K for both pristane and phytane. Both sets of values were fit to a second order polynomial. Comparison with existing literature values for pristane over the temperature range T = (315–452) K are ...
2 CitationsSource
#1James S. Chickos (UMSL: University of Missouri–St. Louis)H-Index: 35
#2Angelo Gavezzotti (University of Milan)H-Index: 54
A database of 1655 critically evaluated sublimation enthalpies of organic compounds is presented. Experimental techniques are briefly reviewed. The consistency of experimental measurements is critically analyzed also as a function of temperature. Isomer effects and chain-length trends in linear substituted alkanes are described. For 737 entries, a match is found with the X-ray structure determination of the corresponding crystalline material as reported in the Cambridge Structural Database. Out ...
9 CitationsSource
#1Ameera Zafar (UMSL: University of Missouri–St. Louis)H-Index: 2
#2James S. Chickos (UMSL: University of Missouri–St. Louis)H-Index: 35
Abstract Vapor pressures and vaporization enthalpies of both squalane and squalene are evaluated by correlation gas chromatography using n-alkanes as standards. Vapor pressures as a function of temperature from T = (298.15–600) K are fit to a second order polynomial. Vaporization enthalpies of (134.4 ± 2.4 and 139.8 ± 2.4) kJ mol−1 and vapor pressures of p = ((15 ± 5.4) and (3.7 ± 1.3))·10−7 Pa at T = 298.15 K are evaluated for squalane and squalene, respectively. Vapor pressures are compared wi...
6 CitationsSource
#1Natsanichapat Siripoltangman (UMSL: University of Missouri–St. Louis)H-Index: 1
#2James S. Chickos (UMSL: University of Missouri–St. Louis)H-Index: 35
Abstract The vaporization enthapies and vapor pressures of three major components in ginger, α-zingiberene, β-sesquiphellandrene, and (-) ar-curcumene are evaluated by correlation gas chromatography using two set of standards, n-alkanes and a series of cyclic and polycyclic hydrocarbons. Vaporization enthalpies are reproduced by both sets of standards. Vapor pressures as a function of temperature are fit to a second order polynomial and the results compared to available literature data. Vapor pr...
4 CitationsSource
#1Patamaporn Umnahanant (UMSL: University of Missouri–St. Louis)H-Index: 7
#2Ameera Zafar (UMSL: University of Missouri–St. Louis)H-Index: 2
Last. James S. Chickos (UMSL: University of Missouri–St. Louis)H-Index: 35
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Abstract This paper examines the use of two different sets of standards, n-alkanes and a more structurally diverse group of cyclic and polycyclic molecules to evaluate the vaporization enthalpies and vapor pressures of (+) longifolene(−)-isolongifolene and β-myrcene using correlation gas chromatography. Both sets of standards provide similar vaporization enthalpies and vapor pressures of the title compounds at T = 298.15 K within their experimental uncertainties. The group of cyclic and polycycl...
5 CitationsSource
#1Kanyavee Wootitunthipong (UMSL: University of Missouri–St. Louis)H-Index: 1
#2James S. Chickos (UMSL: University of Missouri–St. Louis)H-Index: 35
Abstract The vapor pressures and vaporization enthalpies of dibenzofuran, (−) Ambroxide™ and Galaxolide™ are evaluated by correlation gas chromatography. (−) Ambroxide™ and Galaxolide™ are important commercial products, the latter of which has been the subject of some controversy regarding its impact on the environment. All are cyclic ethers. Dibenzofuran, with established literature values was chosen to evaluate the effectiveness of using hydrocarbons to evaluate both vaporization enthalpies an...
2 CitationsSource