The aqueous solubilities and octanol/water partition coefficients at 25 °C are determined for 12 chlorobenzenes and 16 polychlorinated biphenyls (PCBs) and for biphenyl by using the modified generator column method. These values are correlated with chlorine number and with either boiling point for the chlorobenzenes or the relative retention time of a polychlorinated biphenyl eluting from a gas-chromatographic (GC) column. Using differential scanning calorimetry (DSC), we have determined the melting points and enthalpies of melting for those compounds which are solid at room temperature. A correlation between the octanol/water partition coefficient and corrected aqueous solubility Is also presented, and the universality of the derived equation Is demonstrated.

No abstract

No abstract

Experimental profiles have been obtained for large size samples of phenol In normal phase liquid chromatography on silica, using dlchloromethane as mobile phase. These profiles are compared to the profiles predicted by the numerical Integration of the equations of the theory of nonlinear chromatography. This requires the prior determination of accurate sorption Isotherms of phenol between dlchloromethane and silica. The agreement between the experimental and the theoretical profiles Is quantitative In all cases.

The moduli of the slopes, ß and ft, of the nematic and isotropic boundary lines in reduced transition temperature (T* = T/Tm) vs solute mole fraction (0.01 < x2 < 0.06) diagrams are determined for five quasi-spherical (Et4C, Me4Sn, Et4Sn, «-Pr4Sn, and n-Bu4Sn), five chainlike («-C8H18 to «-C^H^, even members), and four rodlike (benzene, 2,4-hexadiyne, biphenyl, and p-terphenyl) solutes in the liquid-crystalline solvent p-n-octyl-p -cyanobiphenyl (8CB). These and earlier experimental results are interpreted and analyzed in terms of theoretical results from the lattice model described in the preceding article (Martire, D. E.; Ghodbane, S. J. Phys. Chem., accompanying article in this issue). It is seen that the agreement between theory and experiment is at least semiquantitative. The lattice model correctly describes the important features of the dependence of ft, and ft on the molecular volume of the quasi-spherical, chainlike, and rodlike solutes and on the length of the end chain of the solvent molecule, as well as the trends in the neat-solvent and dilute-solution contributions to ft, and ft. Also presented and provisionally interpreted are the smectic A-nematic phase equilibrium results for the same solutes in 8CB.