IUPAC-NIST Solubilities Database

IUPAC-NIST Solubility Database
NIST Standard Reference Database 106

Solubility System: 1,10-Phenanthroline with Methanol and Water

Components:
   (1) Water; H2O; [7732-18-5]  NIST Chemistry WebBook for detail
   (2) Methanol; CH4O; [67-56-1]  NIST Chemistry WebBook for detail
   (3) 1,10-Phenanthroline; C12H8N2; [5144-89-8]  NIST Chemistry WebBook for detail

Original Measurements:
   Burgess, J.; Haines, R.I., J. Chem. Eng. Data 1978, 23, 196-197.

Variables:
   Temperature = 298 K
   Concentration = Solvent composition

Prepared By:
   W.E. Acree, Jr.

Experimental Data:   (Notes on the Nomenclature)


t/°C	Concentration c₁ [mol dm**-3]	Ø₂
25.0	0.0149	0.00
25.0	0.0173	0.05
25.0	0.0207	0.10
25.0	0.0247	0.15
25.0	0.0280	0.20
25.0	0.0339	0.25

Notes:
   ^a  ø₂^(s): initial volume fraction of binary solvent mixture; c₁: solubility of the solute expressed in terms of molarity. Equilibrium solid phase is probably a hydrated form of 1, 10-phenanthroline, particularly in the water-rich binary solvent mixtures.

Method/Apparatus/Procedure:
   Constant temperature bath, and an ultraviolet/visable spectrophotometer.
Excess solute and binary solvent equilibrated in a constant temperature vessel. Aliquots of saturated solution withdrawn and concentrations determined spectrometrically at 298.2 nm. Attainment of equilibrium verified by several repetitive measurements.

Source and Purity of Materials:
   (1) Purity and chemical source not specified, was recrystallized from aqueous ethanol.
   (2) Purity and chemical source not specified in paper.
   (3) Purity and chemical source not specified in paper.

Estimated Errors:

   Temperature: T/K: ± 0.1 (compiler). ø₂^(s): ± 0.01 (compiler). c₁: ± 3 % (relative error; compiler).