Abstract
The heat capacities of N-(tert-butoxycarbonyl)-l-phenylalanine (abbreviated to NTBLP in this article), as an important chemical intermediates used to synthesize proteins and polypeptides, were measured by means of a fully automated adiabatic calorimeter over the temperature range from 78 to 350 K. The measured experimental heat capacities were fitted to a polynomial equation as a function of temperature. The thermodynamic functions, H T − H 298.15K and S T − S 298.15K, were calculated based on the heat capacity polynomial equation in the temperature range of (80–350 K) with an interval of 5 K. The thermal stability of the compound was further studied using TG and DSC analyses; a possible mechanism for thermal decomposition of the compound was suggested.
This is a preview of subscription content, log in via an institution to check access.
Similar content being viewed by others
References
Tan ZC, Sun GY, Song YJ, Wang L, Han JR, Wang M. An adiabatic calorimeter for heat capacity measurement of small samples—the heat capacity of nonlinear optical materials KTiOPO4 and RbTiOAsO4 crystals. Thermochim Acta. 2000;352–353:247–53.
Tan ZC, Shi Q, Liu BP, Zhang HT. A fully automated adiabatic calorimeter for heat capacity measurement between 80 and 400 K. J Therm Anal Calorim. 2008;92:367–74.
Tan ZC, Sun GY, Sun Y, Yin AX, Wang WB, Ye JC, et al. An adiabatic low-temperature calorimeter for heat capacity measurement of small samples. J Therm Anal. 1995;45:59–67.
Tan ZC, Sun LX, Meng SH, Li L, Zhang JB. Heat capacities and thermodynamic functions of p-chlorobenzoic acid. J Chem Thermodyn. 2002;341:1417–29.
Archer DG. Thermodynamic properties of synthetic sapphire (α-Al2O3), standard reference material 720 and the effect of temperature-scale differences on thermodynamic properties. J Phys Chem Ref Data. 1993;22:1441–52.
Di YY, Tan ZC, Sun XH, Wang MH, Xu F, Liu YF, et al. Low-temperature heat capacity and standard molar enthalpy of formation of 9-fluorenemethanol (C14H12O). J Chem Thermodyn. 2004;36:79–86.
Acknowledgements
We thank the financial support from the National Nature Science Foundation of China under Grant: NSFC no. 21073189.
Author information
Authors and Affiliations
Corresponding author
Rights and permissions
About this article
Cite this article
Zhao, ZM., Sun, LX. & Tan, ZC. Heat capacities and thermodynamic properties of N-(tert-butoxycarbonyl)-l-phenylalanine (C14H19NO4). J Therm Anal Calorim 107, 1315–1319 (2012). https://doi.org/10.1007/s10973-011-1610-x
Received:
Accepted:
Published:
Issue Date:
DOI: https://doi.org/10.1007/s10973-011-1610-x