Thermodynamic properties of 5(nitrophenyl) furan-2-carbaldehyde isomers

Abstract

BackgroundThe aim of the current work was to determine thermo dynamical properties of 5(2-nitro phenyl)-furan-2-carbaldehyde, 5(3-nitro phenyl)-furan-2-carbaldehyde and 5(4-nitro phenyl)-furan-2-carbaldehyde.ResultsThe temperature dependence of saturated vapor pressure of 5(2-nitro phenyl)-furan-2-carbaldehyde, 5(3-nitro phenyl)-furan-2-carbaldehyde and 5(4-nitro phenyl)-furan-2-carbaldehyde was determined by Knudsen’s effusion method. The results are presented by the Clapeyron–Clausius equation in linear form, and via this form, the standard enthalpies, entropies and Gibbs energies of sublimation and evaporation of compounds were calculated at 298.15 K. The standard molar formation enthalpies of compounds in crystalline state at 298.15 K were determined indirectly by the corresponding standard molar combustion enthalpy, obtained using bomb calorimetry combustion.ConclusionsDetermination of the thermodynamic properties for these compounds may contribute to solving practical problems pertaining optimization processes of their synthesis, purification and application and it will also provide a more thorough insight regarding the theoretical knowledge of their nature.Graphical abstract:Generalized structural formula of investigated compounds and their formation enthalpy determination scheme in the gaseous state

Thermodynamic Characteristics of Ethyl-2-cyano-3-(furan-2-yl)-prop-2-enoate Derivatives

“…The results of the effusion measurements are presented in Table 1, including vapor pressure (P) of the substance in the solid aggregate state and linear equations temperature dependence of vapor pressure in the Clapeyron-Clausius equation coordinates, the value of the enthalpy of sublimation and the temperature ranges (T m ) that were researched. More information about the methodology and calculation of the experiment is presented in [9] The energy of combustion of investigated substances was determined using precision calorimeter V-08-MA with an isothermal shell (± 0.003 K) and static calorimeter bomb [10]. The energy equivalent of the calorimetric system (W=15300±9 J/В) with accuracy ± 0.06 % was estimated by combustion of the reference benzoic acid grade K-1 (the major component content-99.995 % mol).…”

Thermodynamic properties of some isomeric 5-(nitrophenyl)-furyl-2 derivatives

“…Previously, we have published several studies on thermodynamic properties of 5-(nitrophenyl)-2-furaldehydes and ethyl esters of cyan acrylic acids [17–19].…”

Thermodynamic properties 2-methyl-5-phenylfuran-3-carboxylic acids

“…Для досліджень обрано 2-метил-5-фенілфуран-3-карбонову кислоту, синтез якої проводили в три етапи за наведеною на рис.1 схемою. На першому етапі з етилацетоацетату (1) та суспензії металічного натрію у толуені при додаванні фенацилброміду (2) отримували етил-2-ацетил-4-оксо-4арилбутанон (3), який на другому етапі реагував з пентаоксидом фосфору у середовищі бензину, утворюючи етиловий естер 5-арил-2-метил-3-фуранкарбонової кислоти (4). На третьому етапі, обмилюючи синтезований естер (4), отримували 2метил-5-фенілфуран-3-карбонову кислоту (5).…”

“…Ентальпію сублімації кислоти розраховували за температурною залежністю тиску насиченої пари, визначеної інтегральним еффузійним методом Кнудсена. Конструктивні особливості еффузійної установки аналогічні до описаних в [4]. Конструкцію камери та мембран запозичено з [5].…”

“…Конструкцію камери та мембран запозичено з [5]. Методику проведення експериментів підбирали згідно з рекомендаціями [4].…”