ABSTRACT

Low-temperature heat capacities of the 9-fluorenemethanol (C14H12O) have been precisely measured with a small sample automatic adiabatic calorimeter over the temperature range between T=78 K and T=390 K. The solid?liquid phase transition of the compound has been observed to be Tfus=(376.567?0.012) K from the heat-capacity measurements. The molar enthalpy and entropy of the melting of the substance were determined to be fusHm=(26.273?0.013) kJ ? mol-1 and fusSm=(69.770?0.035) J?K-1?mol-1. The experimental values of molar heat capacities in solid and liquid regions have been fitted to two polynomial equations by the least squares method. The constant-volume energy and standard molar enthalpy of combustion of the compound have been determined, cU(C14H12O, s)=-(7125.56 ? 4.62) kJ?mol-1 and cHmo(C14H12O, s)=-(7131.76 ? 4.62) kJ?mol-1, by means of a homemade precision oxygen-bomb combustion calorimeter at T=(298.15?0.001) K. The standard molar enthalpy of formation of the compound has been derived, fHmo(C14H12O,s)=-(92.36 ? 0.97) kJ ? mol-1, from the standard molar enthalpy of combustion of the compound in combination with other auxiliary thermodynamic quantities through a Hess thermochemical cycle.

Compounds

#	Formula	Name
1	CO2	carbon dioxide
2	H2O	water
3	O2	oxygen
4	C14H12O	9-fluorenemethanol

Datasets

The table above is generated from the ThermoML associated json file (link above). POMD and RXND refer to PureOrMixture and Reaction Datasets. The compound numbers are included in properties, variables, and phases, if specificied; the numbers refer to the table of compounds on the left.
Type	Compound-#	Property	Variable	Constraint	Phase	Method	#Points
POMD	4	Molar enthalpy of transition or fusion, kJ/mol ; Crystal			Crystal Liquid Gas	ADIACA:UFactor:4	1
POMD	4	Triple point temperature, K ; Crystal			Crystal Liquid Gas	ADIACA:UFactor:2	1
POMD	4	Molar heat capacity at constant pressure, J/K/mol ; Crystal	Temperature, K; Crystal	Pressure, kPa; Crystal	Crystal	Small (less than 1 g) adiabatic calorimetry	132
POMD	4	Molar heat capacity at constant pressure, J/K/mol ; Liquid	Temperature, K; Liquid	Pressure, kPa; Liquid	Liquid	Small (less than 1 g) adiabatic calorimetry	7
RXND	4 1 2 3	Molar internal energy of reaction at constant volume, kJ/mol				BOMBST:Method:BOMBST	1

Thermodynamics Research Center / ThermoML | Journal of Chemical Thermodynamics

Low-temperature heat capacity and standard molar enthalpy of formation of 9-fluorenemethanol (C14H12O)

Di, [You-Ying], Tan, Z.-C.[Zhi-Cheng], Sun, X.H.[Xiao Hong], Wang, M.-H.[Mei-Han], Xu, F.[Fen], Liu, Y.F.[Yuan Fa], Sun, L.-X.[Li-Xian], Zhang, H.-T.[Hong-Tao]

ABSTRACT