Heats of combustion, sublimation, and formation of four dihalobiphenyls

Journal Article · Tue Mar 31 23:00:00 EST 1964 · J. Phys. Chem.; (United States)

DOI:https://doi.org/10.1021/j100786a043· OSTI ID:7219958

Smith, N K ^[1]; Gorin, G; Good, W D; McCullough, J P

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1. Oklahoma State Univ., Stillwater

The structure and energetics of dihalobiphenyls were investigated by thermochemical methods. Heats of combustion of four dihalobiphenyls were determined by rotating-bomb combustion calorimetry, and the vapor pressure of each was measured by the Knudsen effusion technique. The following values, in kcal. mole/sup -1/, are reported for the heat of formation in the vapor state, ..delta..H line integral/sup 0//sub 298.15/, from graphite and gaseous hydrogen, fluorine, and chlorine: 2,2'-difluorobiphenyl, -45.4; 4,4'-difluorobiphenyl, -46.5; 2,2'-dichlorobiphenyl, +30.4; and 4,4'-dichlorobiphenyl, +28.8. The results are shown to be consistent with known values of interplanar angles of the molecules and earlier calculations of delocalization energy.

• OSTI ID: 7219958
• Journal Information: J. Phys. Chem.; (United States), Journal Name: J. Phys. Chem.; (United States) Vol. 68:4; ISSN JPCHA
• Country of Publication: United States
• Language: English

Related Subjects

37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY
400301* -- Organic Chemistry-- Chemical & Physicochemical Properties-- (-1987)
AROMATICS
CHLORINATED AROMATIC HYDROCARBONS
COMBUSTION HEAT
ENERGY
ENTHALPY
FLUORINATED AROMATIC HYDROCARBONS
FORMATION HEAT
HALOGENATED AROMATIC HYDROCARBONS
HEAT
ORGANIC CHLORINE COMPOUNDS
ORGANIC COMPOUNDS
ORGANIC FLUORINE COMPOUNDS
ORGANIC HALOGEN COMPOUNDS
PHYSICAL PROPERTIES
REACTION HEAT
THERMODYNAMIC PROPERTIES