IUPAC-NIST Solubility Database
NIST Standard Reference Database 106

Glass Ball as Bullet Solubility System: Phenanthrene with Cyclohexane
Components:
   (1) Cyclohexane; C6H12; [110-82-7]  NIST Chemistry WebBook for detail
   (2) Phenanthrene; C14H10; [85-01-8]  NIST Chemistry WebBook for detail
Evaluator:
   W.E. Acree, Jr. Department of Chemistry University of North Texas Denton, Texas 76203-5068 (USA) August, 1994

 Critical Evaluation:
   Phenanthrene solubilities in cyclohexane were retrieved from papers by McLaughlin and Zainal (1), Gordon and Scott (2) and Choi (3). All three studies report values at several temperatures. There is not a prior reason to exclude any of the three studies from the critical evaluation.
Regressional analysis of the experimental data as Ln x1 versus 1/T yielded the following mathematical relationship: Ln x1 = - 5215.6 (1/T) + 14.1709 (r=0.9897) for variation of naphthalene solubility with absolute temperature (see graph below). Phenanthrene does exhibit a solid-solid lambda point phase transition from around 331 to 361 K (4). A graphical plot of Ln x1 versus 1/T is linear if the enthalpy of the transition is relatively small compared to the solute's enthalpy of fusion, as is the case here. The slight nonlinear behavior is undoubtedly attributed to the addittional phase transition.

 Experimental Data:   (Notes on the Nomenclature)

 View Figure 1 for this Evaluation

References: (Click a link to see its experimental data associated with the reference)
   1  McLaughlin, E.; Zainal, H.A., J. Chem. Soc. 1960, 3854-3857.
   2  Gordon, L.J.; Scott, R.L., J. Am. Chem. Soc. 1952, 74, 4138-4140.
   3  Choi, P.B.; Williams, C.P.; Buehring, K.G.; McLaughlin, E., J. Chem. Eng. Data 1985, 30, 403-409.
   4  Choi, P.B.; McLaughlin, E., AICHE J. 1983, 29, 150-153.