Thermodynamics Research Center / ThermoML | International Journal of Thermophysics

Association in Dilute Aqueous Solution of Pyridine and Its Methyl Derivatives Studied by Cryoscopic Method

Serwicka, K.[Kamila], Marczak, W.[Wojciech]
Int. J. Thermophys. 2011, 32, 4, 867-875
ABSTRACT
Pyridine and its methyl derivatives form complexes with water due to hydrogen bonds. The co-operative nature of the hydrogen bonds leads to the association of the complexes and to various modes of hydration. The degrees of association of monohydrate complexes have been calculated for liquid dilute aqueous solutions of pyridine, 2-, 3-, 4-methylpyridine, and 2,6-dimethylpyridine at temperatures from 273 K to 268.5 K. The association number increases with an increase of the amine concentration. Positive correlation was found between the degree of association of the 1:1 water amine complexes and the size of microheterogeneities. It was shown that the mechanics of this process involves hydrogen bonding and van der Waals interactions.
Compounds
# Formula Name
1 H2O water
2 C5H5N pyridine
3 C6H7N 3-methylpyridine
4 C6H7N 4-methylpyridine
5 C6H7N 2-methylpyridine
6 C7H9N 2,6-dimethylpyridine
Datasets
The table above is generated from the ThermoML associated json file (link above). POMD and RXND refer to PureOrMixture and Reaction Datasets. The compound numbers are included in properties, variables, and phases, if specificied; the numbers refer to the table of compounds on the left.
Type Compound-# Property Variable Constraint Phase Method #Points
  • POMD
  • 2
  • 1
  • Solid-liquid equilibrium temperature, K ; Liquid
  • Mole fraction - 2; Liquid
  • Pressure, kPa; Liquid
  • Liquid
  • Crystal - 1
  • VISOBS
  • 10
  • POMD
  • 3
  • 1
  • Solid-liquid equilibrium temperature, K ; Liquid
  • Mole fraction - 3; Liquid
  • Pressure, kPa; Liquid
  • Liquid
  • Crystal - 1
  • VISOBS
  • 11
  • POMD
  • 4
  • 1
  • Solid-liquid equilibrium temperature, K ; Liquid
  • Mole fraction - 4; Liquid
  • Pressure, kPa; Liquid
  • Liquid
  • Crystal - 1
  • VISOBS
  • 13
  • POMD
  • 5
  • 1
  • Solid-liquid equilibrium temperature, K ; Liquid
  • Mole fraction - 5; Liquid
  • Pressure, kPa; Liquid
  • Liquid
  • Crystal - 1
  • DTA
  • 4
  • POMD
  • 6
  • 1
  • Solid-liquid equilibrium temperature, K ; Liquid
  • Mole fraction - 6; Liquid
  • Pressure, kPa; Liquid
  • Liquid
  • Crystal - 1
  • DTA
  • 4