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
Highlights
The aim of the current work was to determine thermo dynamical properties of 5(2-nitro phenyl)-furan2-carbaldehyde, 5(3-nitro phenyl)-furan-2-carbaldehyde and 5(4-nitro phenyl)-furan-2-carbaldehyde
Coincidence of the vapor pressures of aldehydes samples obtained after recrystallization with different multiplicities (A, B, C), (Fig. 1) accurately indicates that our installation is suitable for thermodynamic measurements
The measurement results were processed by the method of least squares and presented as a linear equation: ln P (Pa) = A + B/T with correlation coefficient ρ, by means of which the standard molar enthalpies ∆gcr,l
Summary
The aim of the current work was to determine thermo dynamical properties of 5(2-nitro phenyl)-furan2-carbaldehyde, 5(3-nitro phenyl)-furan-2-carbaldehyde and 5(4-nitro phenyl)-furan-2-carbaldehyde. The formation enthalpy of a substance in the gaseous state, calculated on the basis of the vaporization enthalpy and the formation enthalpy of in condensed form, contains information about the internal interactions between atoms in the molecule. Joint analysis of these properties for a number of compounds will reveal many theoretically important patterns of mutual influence of atoms in a molecule and enable to calculate the enthalpy of formation of free radicals, energy relations, tension, cyclization, determine the additive group contributions to the scheme
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