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:
   Sengupta, D.; Amalendu, P.; Lahiri, S.C., J. Chem. Soc., Dalton Trans. 1983, 2685-2688.

Variables:
   Temperature = 295

Prepared By:
   W.E. Acree, Jr.

Experimental Data:   (Notes on the Nomenclature)


t/°C	Concentration c₁ [mol dm**-3]	Mole Fraction x₂
22.0	0.0169	0.000
22.0	0.0269	0.047
22.0	0.0591	0.099
22.0	0.1496	0.159
22.0	0.4491	0.228
22.0	1.1412	0.307
22.0	2.5072	0.400
22.0	5.1028	0.508
22.0	1.0528	0.639

Notes:
   ^a  x₂^(s): initial mole 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.
Binary solvent mixtures prepared volumetrically and solvent weight percentages calculated from known densities of the pure solvents at 295 K. Excess solute and solvent allowed to equilibrate for 24 hours in a Campbell solubility apparatus. Saturated solutions were filtered and withdrawn by inversion of the apparatus. Concentrations determined spectrophotometrically at 264 nm.

Source and Purity of Materials:
   (1) Reagent grade, E. Merck, was used as received from chemical supplier.
   (2) Purity and chemical source not specified in paper.
   (3) Purity and chemical source not specified in paper.

Estimated Errors:

   Temperature: T/K: ± precision 0.1 (compiler). x₂: ± 0.001 (compiler). c₁: ± 3 % (relative error; compiler).