Pyridine: experimental and calculated chemical thermodynamic properties between 0 and 1500/sup 0/K; a revised vibrational assignment

Conference · Tue Aug 20 04:00:00 EDT 1957 · J. Am. Chem. Soc.; (United States)

OSTI ID:7219947

McCullough, J P; Douslin, D R; Messerly, J F; Hossenlopp, I A; Kincheloe, T C; Waddington, G

From studies by low temperature calorimetry, comparative ebulliometry, flow calorimetry and combustion calorimetry, values were obtained for the entropy, heat capacity and heat of formation of pyridine in the ideal gaseous state. The calorimetric values of entropy and heat capacity served as guides in revising the vibrational assignments for pyridine and several deuteropyridines. The revised assignment for pyridine and molecular structure data were used in computing values of the thermodynamic functions at selected temperatures between 0 and 1500/sup 0/K Values of the heat, free energy and equilibrium constant of formation were calculated at the same selected temperatures. The experimental investigations provided the following information: values of heat capacity for the solid (13-224/sup 0/K), the liquid (C/sub satd/ = 33.633 - 9.1446 x 10/sup -2/T + 3.8478 x 10/sup -4/T/sup 2/ - 3.3430 x 10/sup -7/T/sup 3/, cal. deg./sup -1/ mole/sup -1/ (240-347/sup 0/K)), and the vapor (C/sub p//sup 0/ = -8.262 + 10.608 x 10/sup -2/T - 5.4662 x 10/sup -5/T/sup 2/, cal. deg./sup -1/ mole/sup -1/ (374-500/sup 0/K)); the heat of fusion (1978.6 cal. mole/sup -1/) at the triple point (231.49/sup 0/K); the entropy of the liquid at 298.16/sup 0/K (42.52 cal. deg./sup -1/ mole/sup -1/); the vapor pressure (log/sub 10/ p(mm.) = 7.04162 - 1374.103/(t + 215.014), (67-153/sup 0/)); the heat of vaporization (..delta..Hv = 13077 - 10.201 T - 4.7941 x 10/sup -3/T/sup 2/, cal. mole/sup -1/ (346-388/sup 0/K)); the second virial coefficient in the equation of state, PV = RT (1 + B/V), (B = -15-84.5 exp (950/T), cc. mole/sup -1/ (346-500/sup 0/K)); and the standard heat of formation of the liquid at 298.16/sup 0/K (23.89 kcal. mole/sup -1/).

• Research Organization: Bureau of Mines, Bartlesville, OK
• OSTI ID: 7219947
• Conference Information: Journal Name: J. Am. Chem. Soc.; (United States) Journal Volume: 79
• Country of Publication: United States
• Language: English

Related Subjects

37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY
400301* -- Organic Chemistry-- Chemical & Physicochemical Properties-- (-1987)
AZINES
CALORIMETRY
ENERGY
ENTHALPY
ENTROPY
FORMATION HEAT
FREE ENERGY
FUSION HEAT
HETEROCYCLIC COMPOUNDS
HIGH TEMPERATURE
LOW TEMPERATURE
MEDIUM TEMPERATURE
ORGANIC COMPOUNDS
ORGANIC NITROGEN COMPOUNDS
PHYSICAL PROPERTIES
PYRIDINES
REACTION HEAT
SPECIFIC HEAT
THERMODYNAMIC PROPERTIES
TRANSITION HEAT
ULTRALOW TEMPERATURE
VAPOR PRESSURE
VAPORIZATION HEAT
VERY HIGH TEMPERATURE
VERY LOW TEMPERATURE