Vera L.S. Freitas

On the Vapor Pressures, Phase Transitions, and Solid‐State Fluorescence of 2‐(2‐Hydroxyphenyl)benzoxazole and 2‐(2‐Hydroxyphenyl)benzothiazole

José Miguel Silva Ferraz, Ana Luísa Silva, Lorenza Romagnoli, Andrea Ciccioli et autres

Benzazole derivatives exhibit distinctive photophysical behavior due to excited-state intramolecular proton transfer (ESIPT), making them promising candidates for optoelectronic applications such as organic light-emitting diodes (OLEDs) and fluorescent sensors. Understanding their sublimation energetics, phase behavior, and emissive properties is essential for both …

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Thermodynamic Properties of Two Cinnamate Derivatives with Flavor and Fragrance Features

Vera L.S. Freitas, Carlos A. O. Silva, María D.M.C. Ribeiro da Silva

The standard molar enthalpies of formation in the liquid phase for ethyl (E)-cinnamate and ethyl hydrocinnamate, two cinnamate derivatives with notable flavor and fragrance characteristics, were determined experimentally using combustion calorimetry in an oxygen atmosphere. To derive the gas-phase enthalpies of formation …

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Thermodynamic Properties of Two Cinnamate Derivatives with Flavor and Fragrance Features

Vera L.S. Freitas, Carlos A. O. Silva, María D.M.C. Ribeiro da Silva

The standard molar enthalpies of formation in the liquid phase for ethyl (E)-cinnamate and ethyl hydrocinnamate, two cinnamate derivatives with notable flavor and fragrance characteristics, were determined experimentally using combustion calorimetry in an oxygen atmosphere. To derive the gas-phase enthalpies of formation …

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Thermodynamic study of tin tetraiodide (SnI4) sublimation by effusion techniques

Lorenza Romagnoli, Ana R. R. P. Almeida, José M. Silva Ferraz, Alessandro Latini et autres

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Phase transition study of bathophenanthroline and bathocuproine: A multitechnique approach

José Miguel Silva Ferraz, Lorenza Romagnoli, Bruno Brunetti, Andrea Ciccioli et autres

The thermal behaviour of bathophenanthroline and bathocuproine has been studied using several techniques, namely, differential scanning calorimetry and thermogravimetry. To determine their respective enthalpies of sublimation, vapor pressure measurements were carried out using different methods, such as Knudsen effusion mass loss/mass spectrometry, …

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Determination and Analysis of Thermodynamic Properties of Methyl Methylanthranilate Isomers

Carlos A. O. Silva, Vera L.S. Freitas, María D.M.C. Ribeiro da Silva

The enthalpies of formation in the gaseous phase of methyl 3-methylanthranilate and methyl 5-methylanthranilate were determined from experimental measurements of the corresponding standard energies of combustion, obtained from combustion calorimetry, and the standard enthalpies of vaporization and sublimation, obtained from Calvet microcalorimetry …

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Thermochemical study to assess the energetical and structural effects of nitro substituents in methyl benzoate isomers

J. Manuel Ledo, Henoc Flores, Fernando Ramos, Vera L.S. Freitas et autres

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A Promising Thermodynamic Study of Hole Transport Materials to Develop Solar Cells: 1,3-Bis(N-carbazolyl)benzene and 1,4-Bis(diphenylamino)benzene

Juan Mentado-Morales, Arturo Ximello, Javier Salinas-Luna, Vera L.S. Freitas et autres

The thermochemical study of the 1,3-bis(N-carbazolyl)benzene (NCB) and 1,4-bis(diphenylamino)benzene (DAB) involved the combination of combustion calorimetric (CC) and thermogravimetric techniques. The molar heat capacities over the temperature range of (274.15 to 332.15) K, as well as the melting temperatures and enthalpies of …

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Thermochemical study of anthranilate derivatives: Effect of the size of the alkyl substituent

Vera L.S. Freitas, Carlos A. O. Silva, María D.M.C. Ribeiro da Silva

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The Relative Thermodynamic Stability of Diamond and Graphite

Mary Anne White, Samer Kahwaji, Vera L.S. Freitas, Riko Siewert et autres

Abstract Recent density‐functional theory (DFT) calculations raised the possibility that diamond could be degenerate with graphite at very low temperatures. Through high‐accuracy calorimetric experiments closing gaps in available data, we reinvestigate the relative thermodynamic stability of diamond and graphite. For T<400 K, …

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The Relative Thermodynamic Stability of Diamond and Graphite

Mary Anne White, Samer Kahwaji, Vera L.S. Freitas, Riko Siewert et autres

Abstract Recent density‐functional theory (DFT) calculations raised the possibility that diamond could be degenerate with graphite at very low temperatures. Through high‐accuracy calorimetric experiments closing gaps in available data, we reinvestigate the relative thermodynamic stability of diamond and graphite. For T<400 K, …

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Structural and Energetic Insights on Two Dye Compounds: 1-Acetyl-2-Naphthol and 2-Acetyl-1-Naphthol

Vera L.S. Freitas, María D.M.C. Ribeiro da Silva

The energy involved in the structural switching of acyl and hydroxyl substituents in the title compounds was evaluated combining experimental and computational studies. Combustion calorimetry and Knudsen effusion techniques were used to determine the enthalpies of formation, in the crystalline state, and …

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