title: Thermodynamic properties of 5(nitrophenyl) furan-2-carbaldehyde isomers.
abstract: BACKGROUND
  The 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.
  
  
  RESULTS
  The 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.
  
  
  CONCLUSIONS
  Determination 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.
authors.affiliation: National University "LvivPolytechnic", S. Bandery Str.,12, Lviv, 79013 Ukraine ; P. Kobylytsi str. 19/40, Lviv, 79053 Ukraine.
authors.forename: Volodymyr
authors.initials: V
authors.lastname: Dibrivnyi
authors.affiliation: National University "LvivPolytechnic", S. Bandery Str.,12, Lviv, 79013 Ukraine.
authors.forename: Iryna
authors.initials: I
authors.lastname: Sobechko
authors.affiliation: National University "LvivPolytechnic", S. Bandery Str.,12, Lviv, 79013 Ukraine.
authors.forename: Marian
authors.initials: M
authors.lastname: Puniak
authors.affiliation: Ivan Franko National University of Lviv, Kyryla and Mefodiya Str., 6, Lviv, 79005 Ukraine.
authors.forename: Yuriy
authors.initials: Y
authors.lastname: Horak
authors.affiliation: Ivan Franko National University of Lviv, Kyryla and Mefodiya Str., 6, Lviv, 79005 Ukraine.
authors.forename: Mykola
authors.initials: M
authors.lastname: Obushak
authors.affiliation: National University "LvivPolytechnic", S. Bandery Str.,12, Lviv, 79013 Ukraine.
authors.forename: Yuriy
authors.initials: Y
authors.lastname: Van-Chin-Syan
authors.affiliation: National University "LvivPolytechnic", S. Bandery Str.,12, Lviv, 79013 Ukraine.
authors.forename: Marshalek
authors.initials: M
authors.lastname: Andriy
authors.affiliation: Charles University in Prague, Ovocný trh 3-5, Prague 1, 116 36 Czech Republic.
authors.forename: Nadiia
authors.initials: N
authors.lastname: Velychkivska
keywords: 5(2-Nitrophenyl)-furan-2-carbaldehydes; Combustion enthalpy; Formation enthalpy; Isomerisation enthalpy; Sublimation enthalpy; Vapor pressure; Vaporization enthalpy