Abstract
The low-temperature molar heat capacities of CoPc and CoTMPP were measured by temperature modulated differential scanning calorimetry (TMDSC) over the temperature range from 223 to 413 K for the first time. No phase transition or thermal anomaly was observed in the experimental temperature range for CoPc. However, a structural change was found to be nonreversible for CoTMPP in the temperature range of 368–403 K, which was further validated by the results of IR and XRD. The molar enthalpy ΔH m and entropy ΔS m of phase transition of the CoTMPP were determined to be 3.301 kJ mol−1 and 8.596 J K−1 mol−1, respectively. The thermodynamic parameters of CoPc and CoTMPP such as entropy and enthalpy relative to reference temperature 298.15 K were derived based on the above molar heat capacity data. Moreover, the thermal stability of these two compounds was further investigated through TG measurements. Three steps of mass loss were observed in the TG curve for CoPc and five steps for CoTMPP.
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References
W. Göpel, Synth. Met., 41 (1991) 1087.
M. A. Diaz-Garcia, I. Ledoux, J. A. Duro, T. Torres, F. Agullo-Lopez and J. Zyss, J. Phys. Chem., 98 (1994) 8761.
H. Eichhorn, D. Wohrle and D. Pressner, Liq. Cryst., 22 (1997) 643.
D. Lelievre, M. A. Petit and J. Simon, Liq. Cryst., 4 (1989) 707.
J. D. Wright, P. Roisin, G. P. Rigby, R. J. M. Nolte, M. J. Cook and S. C. Thorpe, Sens. Actutaors B, 13 (1993) 276.
J. H. Zagal, Coord. Chem. Rev., 119 (1992) 89.
P. Janda, N. Kobayashi, P. R. Auburn, H. Lam, C. C. Leznoff and A. B. P. Lever, Can. J. Chem., 67 (1989) 1109.
N. Kobayashi and W. A. Nevin, Appl. Organomet. Chem., 10 (1996) 579.
W. J. Todd, F. Bailly, J. Pavez, P. W. Faguy, R. P. Baldwin and R. M. Buchanan, J. Am. Chem. Soc., 120 (1998) 4887.
M. K. Halbert and R. P. Baldwin, Anal. Chem., 57 (1985) 591.
E. Karmann, D. Schlettwein and N. I. Jaeger, J. Electroanal. Chem., 405 (1996) 149.
R. Zhou, F. Josse, W. Gopel, Z. Z. Ozturk and O. Bekarolu, Appl. Organomet. Chem., 10 (1996) 557.
D. Wöhrle, L. Kreienhoop, G. Schnurpfeil, J. Elbe, B. Tennigkeit, S. Hiller and D. Schlettwein, J. Mater. Chem., 5 (1995) 1819.
N. Toshima, T. Tominaga and S. Kawamura, B. Chem. Soc. Jpn., 69 (1996) 245.
B. Lukas, J. Silver, D. R. Lovett and M. J. Cook, Chem. Phys. Lett., 241 (1995) 351.
S. Yoshimoto, A. Tada, K. Suto and K. Itaya, J. Phys. Chem. B, 107 (2003) 5836.
Y. H. Lu and R. G. Reddy, Electrochim. Acta, 52 (2007) 2562.
X.H. Wei, X.H. Du, D.H. Chen and Z.P. Chen, Thermochim. Acta, 440 (2006) 181.
R. Huszank and O. Horvath, Chem. Commun., (2005) 224.
S. Sathyanarayana and N. Munichandraiah, J. Appl. Electrochem., 11 (1981) 33.
M. Maja, C. Orecchia, M. Strano, P. Tosco and M. Vanni, Electrochim. Acta, 46 (2000) 423.
N.A. Savastenko, V. Brüser, M. Brüser, K. Anklam, S. Kutschera, H. Steffen and A. Schmuhl, J. Power Sources, 165 (2007) 24.
M. Reading, D. Elliot and V. L. Hill, Proc. of the 21st North American Thermal Analysis Society Conference, (1992) 145.
B. Wunderlich, Y. Jin and A. Boller, Thermochim. Acta, 238 (1994) 277.
R. L. Danley, Thermochim. Acta, 402 (2003) 91.
B. Wunderlich, J. Therm. Anal. Cal., 85 (2006) 179.
S. Heidenreich, T. Langner and H. Rohm, J. Therm. Anal. Cal., 89 (2007) 815.
Z. A. Mohd Ishak, P. P. Shang and J. Karger-Kocsis, J. Therm. Anal. Cal., 94 (2006) 637.
M. Varma-Nair and B. Wunderlich, J. Therm. Anal. Cal., 46 (1996) 879.
J. Majumdar, F. Cser, M. C. Jollands and R. A. Shanks, J. Therm. Anal. Cal., 78 (2004) 849.
B. Wunderlich, J. Therm. Anal. Cal., 48 (1997) 207.
D. G. Archer, J. Phys. Chem. Ref. Data, 22 (1992) 1441.
D. C. Ginnings and G. T. Furukawa, J. Am. Chem. Soc., 75 (1953) 522.
P. J. Linstrom, W. G. Mallard, Eds, NIST Chemistry WebBook, NIST Standard Reference Database Number 69, National Institute of Standards and Technology, Gaithersburg MD, July 2001, p. 20899 (http://webbook.nist.gov).
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Qiu, S.J., Chu, H.L., Zhang, J. et al. Heat capacities and thermodynamic properties of CoPc and CoTMPP. J Therm Anal Calorim 91, 841–848 (2008). https://doi.org/10.1007/s10973-007-8625-3
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DOI: https://doi.org/10.1007/s10973-007-8625-3