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The standard molar enthalpies of formation of 5,10,15,20-tetraphenylporphine and 5,10,15,20-tetrakis(4-methoxyphenyl)porphine by oxygen bomb combustion calorimetry

✍ Scribed by R. Patiño; L.A. Torres; M. Campos

Publisher
Elsevier Science
Year
1999
Tongue
English
Weight
90 KB
Volume
31
Category
Article
ISSN
0021-9614

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✦ Synopsis

The standard massic energies of combustion c u o at T = 298.15 K were determined from combustion calorimetry experiments for solid 5,10,15,20-tetraphenylporphine (TPP, Chemical Abstracts registry number 917-23-7) and 5,10,15,20-tetrakis (4-methoxyphenyl) porphine (TMPP, Chemical Abstracts registry number 22112-78-3), leading to the following results:

where c U o m , c H o m , and f H o m denote the standard molar energy of combustion, standard molar enthalpy of combustion, and standard molar enthalpy of formation, respectively. The values of the derived standard molar enthalpies of formation differ significantly from the only known literature results, especially for TMPP. It is concluded that the final results are strongly dependent on the purity of the samples.

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