Thiacyclobutane: heat capacity, heats of transition, fusion and vaporization, vapor pressure, entropy, heat of formation, and thermodynmic functions

Journal Article · Sat Jun 20 04:00:00 EDT 1953 · J. Am. Chem. Soc.; (United States)

DOI:https://doi.org/10.1021/ja01108a001· OSTI ID:7319818

Scott, D W; Finke, H L; Hubbard, W N; McCullough, J P; Katz, C; Gross, M E; Messerly, J F; Pennington, R E; Waddington, G

Detailed studies were made of the thermodynamic properties of thiacyclobutane. The properties determined experimentally included: heat capacity of the solid and the liquid between 12 and 321/sup 0/K, transition temperature (176.7/sup 0/K), heat of transition (159.8 cal. mole/sup -1/), triple point (199.91/sup 0/K), heat of fusion (1971 cal. mole/sup -1/), vapor pressure between 48 and 132/sup 0/ (log/sub 10/ p = 701667--1321.331/(t + 224.513) (p in mm. and t in /sup 0/C)), heat of vaporization (8234 cal. mole/sup -1/ at 327.53/sup 0/K), heat capacity of the vapor (C/sup 0//sub p/ = 20.7 cal. deg./sup -1/ mole/sup -1/ at 377.20/sup 0/K.), entropy of the liquid (44.72 and 47.32 cal. deg./sup -1/ mole/sup -1/ at 298.16 and 327.53/sup 0/K., respectively), entropy of the vapor (S/sup 0/ = 68.17 and 69.75 cal. deg./sup -1/ mole/sup -1/ at 298.16 and 327.53/sup 0/K., respectively) and heat of formation (for the reaction: 3C(graphite) + 3H/sub 2/(g) + S(rhombic) = C/sub 9/H/sub 6/S(1), ..delta..H/sup 0//sub 298.16/ = 6.20 kcal. mole/sup -1/). The functions -(F/sup 0/ - H/sup 0//sub 0/)/T, (H/sup 0/- H/sup 0//sub 0/)/T, H/sup 0/ - H/sup 0//sub 0/, S/sup 0/ and C/sup 0//sub p/ were computed by the methods of statistical mechanics for selected temperatures up to 1000/sup 0/K. Values of the standard heat, standard free energy and common logarithm of the equilibrium constant of formation were obtained for the same temperatures. Spectroscopic and calorimetric data were shown to favor a planar-ring structure of C/sub 2//sub v/ symmetry for the thiacyclobutane molecule.

• Research Organization: Bureau of Mines, Bartlesville, OK
• OSTI ID: 7319818
• Journal Information: J. Am. Chem. Soc.; (United States), Journal Name: J. Am. Chem. Soc.; (United States) Vol. 75:12; ISSN JACSA
• Country of Publication: United States
• Language: English

Related Subjects

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