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Flores H, Ramos F, Hernández-Pérez JM, Solano-Altamirano JM, Camarillo EA, Sandoval-Lira J. Stabilizing Effect of a 4c/6e Hypervalent Bond in Dinitrodiphenyl Disulfides and Their Thermochemical Properties: Experimental and Computational Approach. J Phys Chem A 2023. [PMID: 37365903 DOI: 10.1021/acs.jpca.3c01624] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 06/28/2023]
Abstract
Thermochemical properties and intramolecular interactions of 2,2'-dinitrodiphenyl disulfide (2DNDPDS) and 4,4'-dinitrodiphenyl disulfide (4DNDPDS) were determined and analyzed. Their standard molar formation enthalpies in the gas phase (ΔfHm°(g)'s) were experimentally determined; theoretically, they were computed using the G4 composite method and atomization reactions. Specifically, ΔfHm°(g)'s were obtained by combining formation enthalpies in the condensed phase and enthalpies of phase change. Formation enthalpies in the condensed phase were determined experimentally through combustion energies, which in turn were found by means of a rotatory bomb combustion calorimeter. Sublimation enthalpies were derived from thermogravimetric experiments, measuring the rate of mass loss and using Langmuir and Clausius-Clapeyron equations. Fusion enthalpies and heat capacities of the solid and liquid phases were measured as functions of temperature by differential scanning calorimetry, and the heat capacities of the gas phase were calculated via molecular orbital calculations. Theoretical and experimental ΔfHm°(g)'s differed by <5.5kJ·mol-1, and isomerization enthalpies are discussed. In addition, using theoretical tools [natural bond orbitals (NBO) and quantum theory of atoms in molecules (QTAIM)], intramolecular interactions were analyzed. An uncommon hypervalent four-center six-electron interaction of type O···S-S···O was found in 2DNDPDS. This hypervalent interaction, in addition to the extent of conjugation between the aryl and NO2 moieties and the formation of intramolecular C-H···S hydrogen bonds, counteracts the repulsion caused by steric repulsions. Hydrogen bonding was confirmed through geometric parameters as well as QTAIM.
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Affiliation(s)
- Henoc Flores
- Facultad de Ciencias Químicas, Benemérita Universidad Autónoma de Puebla, 14 sur y Av. San Claudio, C.P. 72570 Puebla Pue., Mexico
| | - Fernando Ramos
- Facultad de Ciencias Químicas, Benemérita Universidad Autónoma de Puebla, 14 sur y Av. San Claudio, C.P. 72570 Puebla Pue., Mexico
| | - Julio M Hernández-Pérez
- Facultad de Ciencias Químicas, Benemérita Universidad Autónoma de Puebla, 14 sur y Av. San Claudio, C.P. 72570 Puebla Pue., Mexico
| | - Juan M Solano-Altamirano
- Facultad de Ciencias Químicas, Benemérita Universidad Autónoma de Puebla, 14 sur y Av. San Claudio, C.P. 72570 Puebla Pue., Mexico
| | - E Adriana Camarillo
- Facultad de Ciencias Químicas, Benemérita Universidad Autónoma de Puebla, 14 sur y Av. San Claudio, C.P. 72570 Puebla Pue., Mexico
| | - Jacinto Sandoval-Lira
- Departamento de Ingeniería Ambiental, Instituto Tecnológico Superior de San Martín Texmelucan, C.P. 74120 San Martín Texmelucan, Pue., Mexico
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Santiago-Sosa O, Camarillo EA, García-Pineda S, Solano-Altamirano JM, Hernández-Pérez JM, Flores H, Rodríguez-Santiago J, Hernández-Esparza R. Phase change enthalpies of some monosubstituted derivatives of adamantane: an experimental and theoretical study. Struct Chem 2022. [DOI: 10.1007/s11224-022-02073-0] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
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3
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Thermochemical Study of 1-Methylhydantoin. MOLECULES (BASEL, SWITZERLAND) 2022; 27:molecules27020556. [PMID: 35056871 PMCID: PMC8777693 DOI: 10.3390/molecules27020556] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 11/26/2021] [Revised: 01/03/2022] [Accepted: 01/12/2022] [Indexed: 11/17/2022]
Abstract
Using static bomb combustion calorimetry, the combustion energy of 1-methylhydantoin was obtained, from which the standard molar enthalpy of formation of the crystalline phase at T = 298.15 K of the compound studied was calculated. Through thermogravimetry, mass loss rates were measured as a function of temperature, from which the enthalpy of vaporization was calculated. Additionally, some properties of fusion were determined by differential scanning calorimetry, such as enthalpy and temperature. Adding the enthalpy of fusion to the enthalpy of vaporization, the enthalpy of sublimation of the compound was obtained at T = 298.15 K. By combining the enthalpy of formation of the compound in crystalline phase with its enthalpy of sublimation, the respective standard molar enthalpy of formation in the gas phase was calculated. On the other hand, the results obtained in the present work were compared with those of other derivatives of hydantoin, with which the effect of the change of some substituents in the base heterocyclic ring was evaluated.
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Energy contribution of heterocyclic sulfur and a disulfide bond in solid and gaseous phase. Struct Chem 2021. [DOI: 10.1007/s11224-021-01851-6] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
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5
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Malallah OS, Hammond B, Al-Adhami T, Buanz A, Alqurshi A, Carswell WD, Rahman KM, Forbes B, Royall PG. Solid-state epimerisation and disproportionation of pilocarpine HCl: Why we need a 5-stage approach to validate melting point measurements for heat-sensitive drugs. Int J Pharm 2020; 574:118869. [DOI: 10.1016/j.ijpharm.2019.118869] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/22/2018] [Revised: 10/10/2019] [Accepted: 11/11/2019] [Indexed: 10/25/2022]
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Al Nimer A, Rocha L, Rahman MA, Nizkorodov SA, Al-Abadleh HA. Effect of Oxalate and Sulfate on Iron-Catalyzed Secondary Brown Carbon Formation. ENVIRONMENTAL SCIENCE & TECHNOLOGY 2019; 53:6708-6717. [PMID: 31034222 DOI: 10.1021/acs.est.9b00237] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/09/2023]
Abstract
Oxalate and sulfate are ubiquitous components of ambient aerosols with a high complexation affinity to iron. However, their effect on iron-driven secondary brown carbon formation in solution from soluble aromatic and aliphatic reagents was not studied. We report masses and hydrodynamic particle sizes of insoluble particles formed from the dark aqueous phase reaction of catechol, guaiacol, fumaric, and muconic acids with Fe(III) in the presence of oxalate or sulfate. Results show that oxalate decreases particle yield in solution from the reaction of Fe(III), with a stronger effect for guaiacol than catechol. For both compounds, the addition of sulfate results in the formation of more polydisperse (0.1-5 μm) and heavier particles than those from control experiments. Reactions with fumaric and muconic acids show that oxalate (not sulfate) and pH are determining factors in the efficiency of particle formation in solution. Polymerization reactions occur readily in the presence of sulfate in solution producing particles with iron-coordinated and/or pore-trapped sulfate anions. The addition of oxalate to the reactions of Fe(III) with all organics, except guaiacol, produced fewer and larger polymeric particles (>0.5 μm). These results imply that even in the presence of competing ligands, the formation of insoluble and colored particles from soluble organic precursors still dominates over the formation of soluble iron complexes.
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Affiliation(s)
- Aseel Al Nimer
- Department of Chemistry and Biochemistry , Wilfrid Laurier University , Waterloo , ON N2L 3C5 , Canada
| | - Laura Rocha
- Department of Chemistry and Biochemistry , Wilfrid Laurier University , Waterloo , ON N2L 3C5 , Canada
| | - Mohammad A Rahman
- Department of Chemistry and Biochemistry , Wilfrid Laurier University , Waterloo , ON N2L 3C5 , Canada
| | - Sergey A Nizkorodov
- Department of Chemistry , University of California , Irvine , CA 92697 , United States
| | - Hind A Al-Abadleh
- Department of Chemistry and Biochemistry , Wilfrid Laurier University , Waterloo , ON N2L 3C5 , Canada
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Ture S, Gurbanov R. Synthesis and structural characterization of geminal and non-geminal 1,1,3,3-tetramethylguanidine substituted derivatives of cyclotriphosphazene: Thermal and spectroscopic investigations of the products. PHOSPHORUS SULFUR 2018. [DOI: 10.1080/10426507.2018.1487434] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/28/2022]
Affiliation(s)
- Sedat Ture
- Department of Chemistry, Faculty of Arts and Sciences, Bilecik Seyh Edebali University, Bilecik, Turkey
| | - Rafig Gurbanov
- Department of Molecular Biology and Genetics, Faculty of Arts and Sciences, Bilecik Seyh Edebali University, Bilecik, Turkey
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Ohira SI, Kaneda K, Matsuzaki T, Mori S, Mori M, Toda K. Universal HPLC Detector for Hydrophilic Organic Compounds by Means of Total Organic Carbon Detection. Anal Chem 2018; 90:6461-6467. [PMID: 29733193 DOI: 10.1021/acs.analchem.7b04849] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
Most quantifications are achieved by comparison of the signals obtained with the sample to those from a standard. Thus, the purity and stability of the standard are key in chemical analysis. Furthermore, if an analyte standard cannot be obtained, quantification cannot be achieved, even if the chemical structures are identified by a qualification method (e.g., high-resolution mass spectrometry). Herein, we describe a universal and analyte standard-free detector for aqueous-eluent-based high-performance liquid chromatography. This universal carbon detector (UCD) was developed based on total organic carbon detection. Separated analytes were oxidized in-line and converted to carbon dioxide (CO2). Generated CO2 was transferred into the gas phase and collected into ultrapure water, which was followed by conductivity detection. The system can be applied as a HPLC detector that does not use an organic solvent as an eluent. The system can be calibrated with a primary standard of sodium bicarbonate for organic compounds. The universality and quantification were evaluated with organic compounds, including organic acids, sugars, and amino acids. Furthermore, the system was successfully applied to evaluation of the purity of formaldehyde in formalin solution, and determination of sugars in juices. The results show the universal carbon detector has good universality and can quantify many kinds of organic compounds with a single standard such as sodium bicarbonate.
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Affiliation(s)
- Shin-Ichi Ohira
- Department of Chemistry , Kumamoto University , 2-39-1 Kurokami , Kumamoto , 860-8555 , Japan
| | - Kyosuke Kaneda
- Department of Chemistry , Kumamoto University , 2-39-1 Kurokami , Kumamoto , 860-8555 , Japan
| | - Toru Matsuzaki
- Department of Chemistry , Kumamoto University , 2-39-1 Kurokami , Kumamoto , 860-8555 , Japan
| | - Shuta Mori
- Department of Chemistry , Kumamoto University , 2-39-1 Kurokami , Kumamoto , 860-8555 , Japan
| | - Masanobu Mori
- Faculty of Science and Technology , Kochi University , 2-5-1 Akebono-cho , Kochi , 780-8520 , Japan
| | - Kei Toda
- Department of Chemistry , Kumamoto University , 2-39-1 Kurokami , Kumamoto , 860-8555 , Japan
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Ramos F, Flores H, Hernández-Pérez JM, Sandoval-Lira J, Camarillo EA. The Intramolecular Hydrogen Bond N–H···S in 2,2′-Diaminodiphenyl Disulfide: Experimental and Computational Thermochemistry. J Phys Chem A 2017; 122:239-248. [DOI: 10.1021/acs.jpca.7b08838] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Fernando Ramos
- Facultad de Ciencias
Químicas de la Benemérita Universidad Autónoma
de Puebla 14 sur y Av. San Claudio, C.P. 72570, Puebla Pue, México
| | - Henoc Flores
- Facultad de Ciencias
Químicas de la Benemérita Universidad Autónoma
de Puebla 14 sur y Av. San Claudio, C.P. 72570, Puebla Pue, México
| | - Julio M. Hernández-Pérez
- Facultad de Ciencias
Químicas de la Benemérita Universidad Autónoma
de Puebla 14 sur y Av. San Claudio, C.P. 72570, Puebla Pue, México
| | - Jacinto Sandoval-Lira
- Facultad de Ciencias
Químicas de la Benemérita Universidad Autónoma
de Puebla 14 sur y Av. San Claudio, C.P. 72570, Puebla Pue, México
| | - E. Adriana Camarillo
- Facultad de Ciencias
Químicas de la Benemérita Universidad Autónoma
de Puebla 14 sur y Av. San Claudio, C.P. 72570, Puebla Pue, México
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Monitoring of Pentoxifylline Thermal Behavior by Novel Simultaneous Laboratory Small and Wide X-Ray Scattering (SWAXS) and Differential Scanning Calorimetry (DSC). PLoS One 2016; 11:e0159840. [PMID: 27467972 PMCID: PMC4965141 DOI: 10.1371/journal.pone.0159840] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/30/2015] [Accepted: 07/08/2016] [Indexed: 11/19/2022] Open
Abstract
The thermal and structural evolutions associated to active pharmaceutical ingredient (API) purity are monitored using a laboratory instrument (S3-MicroCaliX) allowing simultaneous time-resolved X-ray scattering at both wide and small angles (SWAXS) as a function of temperature. This is performed simultaneously with differential scanning calorimetric (DSC) that is carried out in the same apparatus at scanning rate of 2 K/min on the same sample in the range from 20° to 200°C. We have studied simultaneous thermal and structural properties of pentoxifylline, as an active pharmaceutical ingredient (API), for its purity quality control. We have found a satisfying API purity, due to obtained melting temperature and enthalpy values, which are in a well agreement with literature. We have also found that the combination of these techniques allows the thermal monitoring of scanning rates of 2 K/min, continuously without the need for static thermal equilibration, particularly for X-ray spectra. Hence, DSC and SWAXS allowing better identification of the structural thermal events recorded by following of the phase transitions simultaneously. This interpretation is much better possible when X-ray scattering at small and wide angles is coupled with DSC from the same sample. Hence, as a laboratory tool, the method presents a reproducible thermal and crystallographic API purity quality control of non-complex samples, as crucial information for pharmaceutical technology.
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11
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Theoretical Considerations of the Partition Uptake of Nonionic Organic Compounds by Soil Organic Matter. ACTA ACUST UNITED AC 2015. [DOI: 10.2136/sssaspecpub22.c1] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 04/21/2023]
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12
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Metrological approaches to organic chemical purity: primary reference materials for vitamin D metabolites. Anal Bioanal Chem 2015; 407:8557-69. [DOI: 10.1007/s00216-015-9013-7] [Citation(s) in RCA: 20] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/06/2015] [Revised: 08/19/2015] [Accepted: 08/26/2015] [Indexed: 11/25/2022]
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13
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Emel’yanenko VN, Zaitsau DH, Shoifet E, Meurer F, Verevkin SP, Schick C, Held C. Benchmark Thermochemistry for Biologically Relevant Adenine and Cytosine. A Combined Experimental and Theoretical Study. J Phys Chem A 2015; 119:9680-91. [DOI: 10.1021/acs.jpca.5b04753] [Citation(s) in RCA: 48] [Impact Index Per Article: 5.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Vladimir N. Emel’yanenko
- Department
of Physical Chemistry and Department, Science and Technology of Life,
Light and Matter, University of Rostock, Dr-Lorenz-Weg 1, D-18059, Rostock, Germany
- Department
of Physical Chemistry, Kazan Federal University, Kremlevskaya str. 18, 420008 Kazan, Russia
| | - Dzmitry H. Zaitsau
- Department
of Physical Chemistry, Kazan Federal University, Kremlevskaya str. 18, 420008 Kazan, Russia
| | - Evgeni Shoifet
- Institut
für Physik, Universität Rostock, Wismarsche Strasse 43-45, 18051 Rostock, Germany
| | - Florian Meurer
- Department
BCI, Laboratory of Thermodynamics, Technische Universität Dortmund, D-44227 Dortmund, Germany
| | - Sergey P. Verevkin
- Department
of Physical Chemistry and Department, Science and Technology of Life,
Light and Matter, University of Rostock, Dr-Lorenz-Weg 1, D-18059, Rostock, Germany
- Department
of Physical Chemistry, Kazan Federal University, Kremlevskaya str. 18, 420008 Kazan, Russia
| | - Christoph Schick
- Institut
für Physik, Universität Rostock, Wismarsche Strasse 43-45, 18051 Rostock, Germany
| | - Christoph Held
- Department
BCI, Laboratory of Thermodynamics, Technische Universität Dortmund, D-44227 Dortmund, Germany
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14
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The Ortho Effect on the Acidic and Alkaline Hydrolysis of Substituted Formanilides. INT J CHEM KINET 2015. [DOI: 10.1002/kin.20925] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
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15
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Volumetric properties of some asymmetrically methyl-N-substituted thioureas in water between (278.15 and 318.15) K at ambient pressure. J Mol Liq 2014. [DOI: 10.1016/j.molliq.2014.08.001] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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16
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Vecchio S. Thermogravimetric method for a rapid estimation of vapor pressure and vaporization enthalpies of disubstituted benzoic acids: an attempt to correlate vapor pressures and vaporization enthalpies with structure. Struct Chem 2013. [DOI: 10.1007/s11224-013-0232-2] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
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17
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KATO J, KOSEKI T, AOKI Y, YAMADA A, TANAKA T. Coulometric Titration of Urea with Electrogenerated Hypobromite. ANAL SCI 2013; 29:753-5. [DOI: 10.2116/analsci.29.753] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
Affiliation(s)
- Jun KATO
- Faculty of Engineering, Tokyo University of Science
- Nuclear Cycle Backend Directorate, Japan Atomic Energy Agency
| | | | - Yukie AOKI
- Faculty of Engineering, Tokyo University of Science
| | - Ayako YAMADA
- Faculty of Engineering, Tokyo University of Science
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Bredikhin AA, Bredikhina ZA, Zakharychev DV, Gubaidullin AT, Fayzullin RR. Chiral drugtimolol maleate as a continuous solid solution: Thermochemical and single crystal X-ray evidence. CrystEngComm 2012. [DOI: 10.1039/c1ce05850a] [Citation(s) in RCA: 32] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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Chiu MH, Prenner EJ. Differential scanning calorimetry: An invaluable tool for a detailed thermodynamic characterization of macromolecules and their interactions. J Pharm Bioallied Sci 2011; 3:39-59. [PMID: 21430954 PMCID: PMC3053520 DOI: 10.4103/0975-7406.76463] [Citation(s) in RCA: 190] [Impact Index Per Article: 14.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/18/2010] [Revised: 10/05/2010] [Accepted: 10/19/2010] [Indexed: 11/04/2022] Open
Abstract
Differential Scanning Calorimetry (DSC) is a highly sensitive technique to study the thermotropic properties of many different biological macromolecules and extracts. Since its early development, DSC has been applied to the pharmaceutical field with excipient studies and DNA drugs. In recent times, more attention has been applied to lipid-based drug delivery systems and drug interactions with biomimetic membranes. Highly reproducible phase transitions have been used to determine values, such as, the type of binding interaction, purity, stability, and release from a drug delivery mechanism. This review focuses on the use of DSC for biochemical and pharmaceutical applications.
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Affiliation(s)
- Michael H Chiu
- Department of Biological Sciences, University of Calgary, T2N 1N4 Calgary, AB, Canada
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Nara O. Automatic twin vessel recrystallizer. Effective purification of acetaminophen by successive automatic recrystallization and absolute determination of purity by DSC. Anal Chim Acta 2011; 685:91-102. [PMID: 21168556 DOI: 10.1016/j.aca.2010.11.011] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/21/2010] [Revised: 11/01/2010] [Accepted: 11/07/2010] [Indexed: 11/26/2022]
Abstract
I describe an interchangeable twin vessel (J, N) automatic glass recrystallizer that eliminates the time-consuming recovery and recycling of crystals for repeated recrystallization. The sample goes in the dissolution vessel J containing a magnetic stir-bar K; J is clamped to the upper joint H of recrystallizer body D. Empty crystallization vessel N is clamped to the lower joint M. Pure solvent is delivered to the dissolution vessel and the crystallization vessel via the head of the condenser A. Crystallization vessel is heated (P). The dissolution reservoir is stirred and heated by the solvent vapor (F). Continuous outflow of filtrate E out of J keeps N at a stable boiling temperature. This results in efficient dissolution, evaporation and separation of pure crystals Q. Pure solvent in the dissolution reservoir is recovered by suction. Empty dissolution and crystallization vessels are detached. Stirrer magnet is transferred to the crystallization vessel and the role of the vessels are then reversed. Evacuating mother liquor out of the upper twin vessel, the apparatus unit is ready for the next automatic recrystallization by refilling twin vessels with pure solvent. We show successive automatic recrystallization of acetaminophen from diethyl ether obtaining acetaminophen of higher melting temperatures than USP and JP reference standards by 8× automatic recrystallization, 96% yield at each stage. Also, I demonstrate a novel approach to the determination of absolute purity by combining the successive automatic recrystallization with differential scanning calorimetry (DSC) measurement requiring no reference standards. This involves the measurement of the criterial melting temperature T(0) corresponding to the 100% pure material and quantitative ΔT in DSC based on the van't Hoff law of melting point depression. The purity of six commercial acetaminophen samples and reference standards and an eight times recrystallized product evaluated were 98.8 mol%, 97.9 mol%, 99.1 mol%, 98.3 mol%, 98.4 mol%, 98.5 mol% and 99.3 mol% respectively.
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Affiliation(s)
- Osamu Nara
- Department of Molecular Structure Analysis, Tohoku Pharmaceutical University, 4-4-1, Komatsushima, Aobaku, Sendai, Miyagi, 981-0905, Japan.
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21
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Morais VM, Sousa CC, Matos MAR. Experimental and computational study of the energetics of methoxycoumarins. ACTA ACUST UNITED AC 2010. [DOI: 10.1016/j.theochem.2009.11.036] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/20/2022]
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22
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Ribeiro da Silva MAV, Santos AFLOM, Gomes JRB, Roux MV, Temprado M, Jiménez P, Notario R. Thermochemistry of Bithiophenes and Thienyl Radicals. A Calorimetric and Computational Study. J Phys Chem A 2009; 113:11042-50. [DOI: 10.1021/jp905531c] [Citation(s) in RCA: 23] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/02/2023]
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23
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Matos MAR, Sousa CCS, Miranda MS, Morais VMF, Liebman JF. Energetics of Coumarin and Chromone. J Phys Chem B 2009; 113:11216-21. [DOI: 10.1021/jp9026942] [Citation(s) in RCA: 36] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- M. Agostinha R. Matos
- Centro de Investigação em Química, Departamento de Química, Faculdade de Ciências da Universidade do Porto, Rua do Campo Alegre, 687, P-4169-007 Porto, Portugal, Instituto de Ciências Biomédicas Abel Salazar, ICBAS, Universidade do Porto, P-4099-003 Porto, Portugal, and Department of Chemistry and Biochemistry, University of Maryland, Baltimore County, Baltimore, Maryland 21250
| | - Clara C. S. Sousa
- Centro de Investigação em Química, Departamento de Química, Faculdade de Ciências da Universidade do Porto, Rua do Campo Alegre, 687, P-4169-007 Porto, Portugal, Instituto de Ciências Biomédicas Abel Salazar, ICBAS, Universidade do Porto, P-4099-003 Porto, Portugal, and Department of Chemistry and Biochemistry, University of Maryland, Baltimore County, Baltimore, Maryland 21250
| | - Margarida S. Miranda
- Centro de Investigação em Química, Departamento de Química, Faculdade de Ciências da Universidade do Porto, Rua do Campo Alegre, 687, P-4169-007 Porto, Portugal, Instituto de Ciências Biomédicas Abel Salazar, ICBAS, Universidade do Porto, P-4099-003 Porto, Portugal, and Department of Chemistry and Biochemistry, University of Maryland, Baltimore County, Baltimore, Maryland 21250
| | - Victor M. F. Morais
- Centro de Investigação em Química, Departamento de Química, Faculdade de Ciências da Universidade do Porto, Rua do Campo Alegre, 687, P-4169-007 Porto, Portugal, Instituto de Ciências Biomédicas Abel Salazar, ICBAS, Universidade do Porto, P-4099-003 Porto, Portugal, and Department of Chemistry and Biochemistry, University of Maryland, Baltimore County, Baltimore, Maryland 21250
| | - Joel F. Liebman
- Centro de Investigação em Química, Departamento de Química, Faculdade de Ciências da Universidade do Porto, Rua do Campo Alegre, 687, P-4169-007 Porto, Portugal, Instituto de Ciências Biomédicas Abel Salazar, ICBAS, Universidade do Porto, P-4099-003 Porto, Portugal, and Department of Chemistry and Biochemistry, University of Maryland, Baltimore County, Baltimore, Maryland 21250
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Matos MAR, Miranda MS, Fonseca DAP, Morais VMF, Liebman JF. Calorimetric and Computational Thermochemical Study of 3,3-Tetramethyleneglutaric Acid, 3,3-Tetramethyleneglutaric Anhydride, and 3,3-Tetramethyleneglutarimide. J Phys Chem A 2008; 112:10053-8. [DOI: 10.1021/jp805292x] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- M. Agostinha R. Matos
- Centro de Investigação em Química, Departamento de Química, Faculdade de Ciências da Universidade do Porto, Rua do Campo Alegre, 687, P-4169-007 Porto, Portugal, Instituto de Ciências Biomédicas Abel Salazar, ICBAS, Universidade do Porto, P-4099-003 Porto, Portugal, and Department of Chemistry and Biochemistry, University of Maryland, Baltimore County, Baltimore, Maryland 21250
| | - Margarida S. Miranda
- Centro de Investigação em Química, Departamento de Química, Faculdade de Ciências da Universidade do Porto, Rua do Campo Alegre, 687, P-4169-007 Porto, Portugal, Instituto de Ciências Biomédicas Abel Salazar, ICBAS, Universidade do Porto, P-4099-003 Porto, Portugal, and Department of Chemistry and Biochemistry, University of Maryland, Baltimore County, Baltimore, Maryland 21250
| | - Diana A. P. Fonseca
- Centro de Investigação em Química, Departamento de Química, Faculdade de Ciências da Universidade do Porto, Rua do Campo Alegre, 687, P-4169-007 Porto, Portugal, Instituto de Ciências Biomédicas Abel Salazar, ICBAS, Universidade do Porto, P-4099-003 Porto, Portugal, and Department of Chemistry and Biochemistry, University of Maryland, Baltimore County, Baltimore, Maryland 21250
| | - Victor M. F. Morais
- Centro de Investigação em Química, Departamento de Química, Faculdade de Ciências da Universidade do Porto, Rua do Campo Alegre, 687, P-4169-007 Porto, Portugal, Instituto de Ciências Biomédicas Abel Salazar, ICBAS, Universidade do Porto, P-4099-003 Porto, Portugal, and Department of Chemistry and Biochemistry, University of Maryland, Baltimore County, Baltimore, Maryland 21250
| | - Joel F. Liebman
- Centro de Investigação em Química, Departamento de Química, Faculdade de Ciências da Universidade do Porto, Rua do Campo Alegre, 687, P-4169-007 Porto, Portugal, Instituto de Ciências Biomédicas Abel Salazar, ICBAS, Universidade do Porto, P-4099-003 Porto, Portugal, and Department of Chemistry and Biochemistry, University of Maryland, Baltimore County, Baltimore, Maryland 21250
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Matos MAR, Sousa CCS, Morais VMF. Experimental and Computational Thermochemistry of 1,4-Benzodioxan and its 6-R Derivatives. J Phys Chem A 2008; 112:7961-8. [DOI: 10.1021/jp803579y] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- M. Agostinha R. Matos
- Centro de Investigação em Química, Departamento de Química, Faculdade de Ciências, Universidade do Porto, Rua do Campo Alegre, 687, P-4169-007 Porto, Portugal, and Instituto de Ciências Biomédicas Abel Salazar, ICBAS, Universidade do Porto, P-4099-003 Porto, Portugal
| | - Clara C. S. Sousa
- Centro de Investigação em Química, Departamento de Química, Faculdade de Ciências, Universidade do Porto, Rua do Campo Alegre, 687, P-4169-007 Porto, Portugal, and Instituto de Ciências Biomédicas Abel Salazar, ICBAS, Universidade do Porto, P-4099-003 Porto, Portugal
| | - Victor M. F. Morais
- Centro de Investigação em Química, Departamento de Química, Faculdade de Ciências, Universidade do Porto, Rua do Campo Alegre, 687, P-4169-007 Porto, Portugal, and Instituto de Ciências Biomédicas Abel Salazar, ICBAS, Universidade do Porto, P-4099-003 Porto, Portugal
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Matos MAR, Miranda MS, Monte MJS, Santos LMNBF, Morais VMF, Chickos JS, Umnahanant P, Liebman JF. Calorimetric and Computational Study of Indanones. J Phys Chem A 2007; 111:11153-9. [DOI: 10.1021/jp074718d] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- M. Agostinha R. Matos
- Centro de Investigação em Química, Departamento de Química, Faculdade de Ciências, Universidade do Porto, Rua do Campo Alegre, 687, P-4169-007 Porto, Portugal, Instituto de Ciências Biomédicas Abel Salazar, ICBAS, Universidade do Porto, P-4099-003 Porto, Portugal, Department of Chemistry and Biochemistry, University of MissouriSt. Louis, St. Louis, Missouri 63121, and Department of Chemistry and Biochemistry, University of Maryland, Baltimore County, Baltimore, Maryland 21250
| | - Margarida S. Miranda
- Centro de Investigação em Química, Departamento de Química, Faculdade de Ciências, Universidade do Porto, Rua do Campo Alegre, 687, P-4169-007 Porto, Portugal, Instituto de Ciências Biomédicas Abel Salazar, ICBAS, Universidade do Porto, P-4099-003 Porto, Portugal, Department of Chemistry and Biochemistry, University of MissouriSt. Louis, St. Louis, Missouri 63121, and Department of Chemistry and Biochemistry, University of Maryland, Baltimore County, Baltimore, Maryland 21250
| | - Manuel J. S. Monte
- Centro de Investigação em Química, Departamento de Química, Faculdade de Ciências, Universidade do Porto, Rua do Campo Alegre, 687, P-4169-007 Porto, Portugal, Instituto de Ciências Biomédicas Abel Salazar, ICBAS, Universidade do Porto, P-4099-003 Porto, Portugal, Department of Chemistry and Biochemistry, University of MissouriSt. Louis, St. Louis, Missouri 63121, and Department of Chemistry and Biochemistry, University of Maryland, Baltimore County, Baltimore, Maryland 21250
| | - Luís M. N. B. F. Santos
- Centro de Investigação em Química, Departamento de Química, Faculdade de Ciências, Universidade do Porto, Rua do Campo Alegre, 687, P-4169-007 Porto, Portugal, Instituto de Ciências Biomédicas Abel Salazar, ICBAS, Universidade do Porto, P-4099-003 Porto, Portugal, Department of Chemistry and Biochemistry, University of MissouriSt. Louis, St. Louis, Missouri 63121, and Department of Chemistry and Biochemistry, University of Maryland, Baltimore County, Baltimore, Maryland 21250
| | - Victor M. F. Morais
- Centro de Investigação em Química, Departamento de Química, Faculdade de Ciências, Universidade do Porto, Rua do Campo Alegre, 687, P-4169-007 Porto, Portugal, Instituto de Ciências Biomédicas Abel Salazar, ICBAS, Universidade do Porto, P-4099-003 Porto, Portugal, Department of Chemistry and Biochemistry, University of MissouriSt. Louis, St. Louis, Missouri 63121, and Department of Chemistry and Biochemistry, University of Maryland, Baltimore County, Baltimore, Maryland 21250
| | - James S. Chickos
- Centro de Investigação em Química, Departamento de Química, Faculdade de Ciências, Universidade do Porto, Rua do Campo Alegre, 687, P-4169-007 Porto, Portugal, Instituto de Ciências Biomédicas Abel Salazar, ICBAS, Universidade do Porto, P-4099-003 Porto, Portugal, Department of Chemistry and Biochemistry, University of MissouriSt. Louis, St. Louis, Missouri 63121, and Department of Chemistry and Biochemistry, University of Maryland, Baltimore County, Baltimore, Maryland 21250
| | - Patamaporn Umnahanant
- Centro de Investigação em Química, Departamento de Química, Faculdade de Ciências, Universidade do Porto, Rua do Campo Alegre, 687, P-4169-007 Porto, Portugal, Instituto de Ciências Biomédicas Abel Salazar, ICBAS, Universidade do Porto, P-4099-003 Porto, Portugal, Department of Chemistry and Biochemistry, University of MissouriSt. Louis, St. Louis, Missouri 63121, and Department of Chemistry and Biochemistry, University of Maryland, Baltimore County, Baltimore, Maryland 21250
| | - Joel F. Liebman
- Centro de Investigação em Química, Departamento de Química, Faculdade de Ciências, Universidade do Porto, Rua do Campo Alegre, 687, P-4169-007 Porto, Portugal, Instituto de Ciências Biomédicas Abel Salazar, ICBAS, Universidade do Porto, P-4099-003 Porto, Portugal, Department of Chemistry and Biochemistry, University of MissouriSt. Louis, St. Louis, Missouri 63121, and Department of Chemistry and Biochemistry, University of Maryland, Baltimore County, Baltimore, Maryland 21250
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Ribeiro da Silva MAV, Ferreira AIMCL, Gomes JRB. Experimental and Computational Study of the Thermochemistry of the Fluoromethylaniline Isomers. J Phys Chem B 2007; 111:6444-51. [PMID: 17518494 DOI: 10.1021/jp071232o] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
The standard (po = 0.1 MPa) molar enthalpies of formation in the condensed phase of seven isomers of fluoromethylaniline were derived from the standard molar energies of combustion, in oxygen, to yield CO2(g), N2(g) and HF.10H2O(l), at T = 298.15 K, measured by rotating bomb combustion calorimetry. The standard molar enthalpies of vaporization or sublimation of these compounds, also at T = 298.15 K, were determined using Calvet microcalorimetry, while the enthalpies of fusion of the solid compounds were determined by differential scanning calorimetry. The standard molar enthalpies of formation in the gaseous phase, at T = 298.15 K, were derived from the former two experimental quantities. G3MP2//B3LYP calculations were performed for all possible fluoromethylanilines allowing the estimation of data for the isomers that were not studied experimentally. The Cox scheme was applied with two different approaches for the estimation of the standard molar enthalpies of formation of all the isomers studied, and this led to the conclusion that the literature values for the enthalpies of formation of the meta and para isomers of methylaniline seem to be not reliable. Further G3MP2//B3LYPs calculations on the methylaniline isomers yielded new values for the standard molar enthalpies of formation of the isomers of methylaniline, which have been tested under the Cox scheme, resulting in better estimates.
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Affiliation(s)
- Manuel A V Ribeiro da Silva
- Centro de Investigação em Química, Departamento de Química, Faculdade de Ciências, Universidade do Porto, Rua do Campo Alegre, 687, P-4169-007, Porto, Portugal.
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Ribeiro da Silva MAV, Ferreira AIMCL, Gomes JRB. Combined Experimental and Computational Study of the Thermochemistry of the Fluoroaniline Isomers. J Phys Chem B 2007; 111:2052-61. [PMID: 17279791 DOI: 10.1021/jp0672407] [Citation(s) in RCA: 39] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/06/2023]
Abstract
The standard (p degrees = 0.1 MPa) molar enthalpies of formation in the condensed phase of all the fluoroanilines, with the exception of the 2,3,5-trifluoroaniline compound, were derived from the standard molar energies of combustion in oxygen at T = 298.15 K, measured by rotating bomb combustion calorimetry. Calvet high-temperature vacuum sublimation experiments were performed to measure their enthalpies of vaporization or sublimation. These experiments allowed the determination of the standard molar enthalpies of formation in the gaseous phase and at T = 298.15 K. These values are also compared with estimates based on G3MP2B3 and BP86/6-31+G(d) computations, which have been extended also to the fluoroaniline that was not studied experimentally. The results are in close agreement with a mean deviation of approximately 3 kJ.mol-1. The largest difference between experimental and G3MP2B3 values is found for the pentafluoroaniline (-7.0 kJ.mol-1). For the three monofluoroanilines, the composite approach has been used also to compute gas-phase acidities, electron and proton affinities, ionization enthalpies and N-H bond dissociation enthalpies. The computed values compare well with available experimental results supporting the new computed data.
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Affiliation(s)
- Manuel A V Ribeiro da Silva
- Centro de Investigação em Química, Departamento de Química, Faculdade de Ciências, Universidade do Porto, Rua do Campo Alegre, 687, P-4169-007, Porto, Portugal.
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Ribeiro da Silva MAV, Ferreira AIMCL, Gomes JRB. Experimental and Computational Study on the Thermochemistry of Bromoanilines. BULLETIN OF THE CHEMICAL SOCIETY OF JAPAN 2006. [DOI: 10.1246/bcsj.79.1852] [Citation(s) in RCA: 34] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/02/2023]
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Matos MAR, Miranda MS, Morais VMF, Liebman JF. Benzanilide: on the crossroads of calorimetry, computations and concepts. Mol Phys 2006. [DOI: 10.1080/00268970600845870] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/24/2022]
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33
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Ribeiro da Silva MA, Ferreira AI, Gomes JR. Experimental and computational study on the thermochemistry of the isomers of iodoaniline and diiodoaniline. Chem Phys Lett 2006. [DOI: 10.1016/j.cplett.2006.03.004] [Citation(s) in RCA: 24] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
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34
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Morais VMF, Miranda MS, Matos MAR, Liebman JF. Experimental and computational thermochemistry of three nitrogen-containing heterocycles: 2-benzimidazolinone, 2-benzoxazolinone and 3-indazolinone. Mol Phys 2006. [DOI: 10.1080/00268970500290300] [Citation(s) in RCA: 28] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/25/2022]
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Fattahi A, Kass SR, Liebman JF, Matos MAR, Miranda MS, Morais VMF. The Enthalpies of Formation of o-, m-, and p-Benzoquinone: Gas-Phase Ion Energetics, Combustion Calorimetry, and Quantum Chemical Computations Combined. J Am Chem Soc 2005; 127:6116-22. [PMID: 15839713 DOI: 10.1021/ja042612f] [Citation(s) in RCA: 67] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
Radical anions of o-, m-, and p-benzoquinone were produced in a Fourier transform mass spectrometer by low energy electron attachment or collision-induced dissociation and were differentiated. Classical derivatization experiments also were carried out to authenticate the ortho and meta anions. Gas-phase techniques were used to measure the proton affinities of all three radical anions and the electron affinities of o- and m-benzoquinone. By combining these results in thermodynamic cycles, we derived heats of hydrogenation of o-, m-, and p-benzoquinone (Delta(hyd)H degrees (1o, 1m, and 1p) = 42.8 +/- 4.1, 74.8 +/- 4.1, and 38.5 +/- 3.0 kcal mol(-)(1), respectively) and their heats of formation (Delta(f)H degrees (1o, 1m, and 1p) = -23.1 +/- 4.1, 6.8 +/- 4.1, and -27.7 +/- 3.0 kcal mol(-)(1), respectively). Good accord with the literature value for the para derivative was obtained. Combustion calorimetry and heats of sublimation also were measured for benzil and 3,5-di-tert-butyl-o-benzoquinone. The former heat of formation agreed with previous determinations, while the latter result (Delta(f)H degrees (g) = -73.09 +/- 0.87 kcal mol(-)(1)) was transformed to Delta(f)H degrees (1o) = -18.9 +/- 2.2 kcal mol(-)(1) by removing the effect of the tert-butyl groups via isodesmic reactions. This led to a final value of Delta(f)H degrees (1o) = -21.0 +/- 3.1 kcal mol(-)(1). Additivity was found to work well for m-benzoquinone, but BDE1 and BDE2 for 1,2- and 1,4-dihydroxybenzene differed by a remarkably small 14.1 +/- 4.2 and 23.5 +/- 3.7 kcal mol(-)(1), respectively, indicating that o- and p-benzoquinone should be excellent radical traps.
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Affiliation(s)
- Alireza Fattahi
- Department of Chemistry, University of Minnesota, Minneapolis, Minnesota 55455, USA
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R. Matos MA, Miranda MS, Morais VMF, Liebman * JF. Saccharin: a combined experimental and computational thermochemical investigation of a sweetener and sulfonamide. Mol Phys 2005. [DOI: 10.1080/00268970512331316175] [Citation(s) in RCA: 24] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/26/2022]
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37
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Rodante F, Vecchio S, Slovák V. Application of direct nonlinear regression from single TG curve to compounds undergoing simple and complex thermal decompositions. INT J CHEM KINET 2003. [DOI: 10.1002/kin.10157] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
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Govers HAJ, Krop HB, Parsons JR, Tambach T, Kubicki JD. Dissolved organic carbon--contaminant interaction descriptors found by 3D force field calculations. SAR AND QSAR IN ENVIRONMENTAL RESEARCH 2002; 13:271-280. [PMID: 12071655 DOI: 10.1080/10629360290002767] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/23/2023]
Abstract
Enthalpies of transfer at 300 K of various partitioning processes were calculated in order to study the suitability of 3D force fields for the calculation of partitioning constants. A 3D fulvic acid (FA) model of dissolved organic carbon (DOC) was built in a MM+ force field using AMI atomic charges and geometrical optimization (GO). 3,5-Dichlorobiphenyl (PCB14), 4,4'-dichlorobiphenyl (PCB15), 1,1,1-trichloro-2,2-bis-(4-chlorophenyl)-ethane (PPDDT) and 2-chloro-4-ethylamino-6-isopropylamino-s-triazine (Atrazine) were inserted into different sites and their interaction energies with FA were calculated. Energies of hydration were calculated and subtracted from FA-contaminant interactions of selected sites. The resulting values for the enthalpies of transfer from water to DOC were 2.8, -1.4, -6.4 and 0.0 kcal/mol for PCB 14, PCB15, PPDDT and Atrazine, respectively. The value of PPDDT compared favorably with the experimental value of -5.0 kcal/mol. Prior to this, the method was studied by the calculation of the enthalpies of vaporization and aqueous solution using various force fields. In the MM + force field GO predicted enthalpies of vaporization deviated by +0.7 (PCB14), +3.6 (PCB15) and -0.7 (PPDDT)kcal/mol from experimental data, whereas enthalpies of aqueous solution deviated by -3.6 (PCB14), +5.8 (PCB15) and +3.7 (PPDDT) kcal/mol. Only for PCB14 the wrong sign of this enthalpy value was predicted. Potential advantages and limitations of the approach were discussed.
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Affiliation(s)
- H A J Govers
- Department of Environmental and Toxicological Chemistry, Institute for Biodiversity and Ecosystem Dynamics, University of Amsterdam, The Netherlands.
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McEachern DM, Sandoval O. A molecular flow evaporation apparatus for measuring vapour pressures and heats of sublimation of organic compounds. ACTA ACUST UNITED AC 2001. [DOI: 10.1088/0022-3735/6/2/026] [Citation(s) in RCA: 20] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
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De Fina KM, Sharp TL, Spurgin MA, Chuca I, Acree, Jr. WE, Green CE, Abraham MH. Solubility of the pesticide diuron in organic nonelectrolyte solvents. Comparison of observed vs. predicted values based upon Mobile Order theory. CAN J CHEM 2000. [DOI: 10.1139/v99-243] [Citation(s) in RCA: 17] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
Abstract
Experimental solubilities are reported at 25.0°C for diuron (also called 3-(3,4-dichlorophenyl)-1,1-dimethyl urea) dissolved in 49 different organic nonelectrolyte solvents containing ether-, chloro-, hydroxy-, ester-, methyl-, and tert-butyl-functional groups. Results of these measurements are used to test the applications and limitations of expressions derived from Mobile Order theory. For the 28 nonalcoholic solvents for which predictions could be made computations show that Mobile Order theory does provide fairly reasonable estimates of the saturation mole fraction solubilities. Average absolute deviation between predicted and observed values is 60.1%. Diuron solubilities in the alcohol solvents are used to calculate stability constants for presumed solute-solvent hydrogen bonds that are believed to occur in solution.Key words: pesticide, diuron solubilities, organic nonelectrolyte solvents, solubility predictions.
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De Fina KM, Sharp TL, Acree, Jr. WE. Solubility of biphenyl in organic nonelectrolyte solvents. Comparison of observed versus predicted values based upon Mobile Order theory. CAN J CHEM 1999. [DOI: 10.1139/v99-177] [Citation(s) in RCA: 20] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
Abstract
Experimental solubilities are reported at 25.0°C for biphenyl dissolved in 26 different alkane, dialkyl ether, and alcohol solvents. Results of these measurements, combined with previously published biphenyl solubility data, are used to test the applications and limitations of expressions derived from Mobile Order theory. For the 40 solvents for which predictions could be made computations show that Mobile Order theory does provide fairly reasonable estimates of the saturation mole fraction solubilities. Average absolute deviation between predicted and observed values is 13.0%.Key words: biphenyl solubilities, organic nonelectrolyte solvents, solubility predictions.
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Dannenfelser RM, Yalkowsky SH. Predicting the total entropy of melting: application to pharmaceuticals and environmentally relevant compounds. J Pharm Sci 1999; 88:722-4. [PMID: 10393571 DOI: 10.1021/js9803609] [Citation(s) in RCA: 41] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
Experimental entropy of melting values for physical property estimation schemes, such as solubility and vapor pressure, are not readily available. In this study a semiempirical equation, which contains two molecular parameters, is used to estimate the total entropy of melting for a variety of pharmaceutically and environmentally relevant compounds. A database of experimental entropy values consisting of over 370 different compounds was compiled from literature. A molecular rotational symmetry number and a molecular flexibility number for each compound were defined. The simple equation does very well in predicting the total entropy of melting for the complex set of molecules with an average error of 21%.
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Affiliation(s)
- R M Dannenfelser
- Novartis Pharmaceutical Corporation, 59 Route 10, East Hanover, New Jersey 07936, USA.
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Nara O. Effective purification of ellagic acid by successive automatic recrystallization and absolute determination of purity by absorptivity ratio. Anal Chim Acta 1997. [DOI: 10.1016/s0003-2670(96)00363-7] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
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44
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Rodante F, Marrosu G, Catalani G. Thermal analysis and kinetic study of decomposition processes of some pesticides. ACTA ACUST UNITED AC 1992. [DOI: 10.1007/bf01979743] [Citation(s) in RCA: 14] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/25/2022]
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45
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Sabbah R, Watik LE. New reference materials for the calibration (temperature and energy) of differential thermal analysers and scanning calorimeters. ACTA ACUST UNITED AC 1992. [DOI: 10.1007/bf01979417] [Citation(s) in RCA: 20] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/25/2022]
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par Raphaël S, El Watik L. Nouvelles substances d'intercomparaison proposees pour l'etalonnage en temperature et en energie d'analyseurs thermiques (ou calorimetriques) differentiels. ACTA ACUST UNITED AC 1990. [DOI: 10.1007/bf01913627] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/24/2022]
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47
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Chao RS, Vail KC. Polymorphism of 1,2-dihydro-6-neopentyl-2-oxonicotinic acid: characterization, interconversion, and quantitation. Pharm Res 1987; 4:429-32. [PMID: 3508554 DOI: 10.1023/a:1016498731952] [Citation(s) in RCA: 20] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/06/2023]
Abstract
Two polymorphs of 1,2-dihydro-6-neopentyl-2-oxonicotinic acid have been characterized by X-ray diffraction (XRD), infrared spectroscopy (IR), differential scanning calorimetry (DSC), and thermal (hot-stage) microscopy (HSM). In batch-scale preparation, form I was crystallized in ethanol-water (3:1), while form II was obtained by recrystallization from acetone-water (2:1). The melting points for forms I and II are 193 and 196 degrees C, respectively. Thermal studies (DSC and HSM) showed that form II melts at 196 degrees C, while form I melts at 193 degrees C, immediately followed by a resolidification and remelt at 196 degrees C. The conversion of form II to form I was accomplished by recrystallization from ethanol or methanol, and the form I-to-form II transition was obtained by controlled heating of form I around 194 degrees C. Quantitative XRD was used to determine the polymorphic composition, with a detection limit of less than 1% of the minor form and a linearity of 0-10% form I in form II (correlation coefficient of 0.999).
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Affiliation(s)
- R S Chao
- Product Control Division, Upjohn Company, Kalamazoo, Michigan 49001
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49
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Solubility in binary solvent systems. 6. Prediction of naphthalene and biphenyl solubilities based on the Wilson model. Int J Pharm 1986. [DOI: 10.1016/0378-5173(86)90156-0] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
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50
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Grant DJ, York P. Entropy of processing: a new quantity for comparing the solid state disorder of pharmaceutical materials. Int J Pharm 1986. [DOI: 10.1016/0378-5173(86)90076-1] [Citation(s) in RCA: 21] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/27/2022]
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