Journal of Thermal Analysis and Calorimetry
Volume/Issue:
Volume 54: Issue 1
Thermokinetic Studies of Porphyrin Complexation in Non-Aqueous Solutions by Heat Conduction Microcalorimetry
Authors:
T. Ageeva Russian Academy of Sciences Institute of Non-Aqueous Solutions Chemistry Academicheskaya 1 153045 Ivanovo Russia Academicheskaya 1 153045 Ivanovo Russia

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E. Utzig Polish Academy of Sciences Institute of Physical Chemistry Kasprzaka 44/52 01-224 Warsaw Poland Kasprzaka 44/52 01-224 Warsaw Poland

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O. Golubchikov Russian Academy of Sciences Institute of Non-Aqueous Solutions Chemistry Academicheskaya 1 153045 Ivanovo Russia Academicheskaya 1 153045 Ivanovo Russia

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W. Zielenkiewicz Polish Academy of Sciences Institute of Physical Chemistry Kasprzaka 44/52 01-224 Warsaw Poland Kasprzaka 44/52 01-224 Warsaw Poland

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Pages:
243–248
Online Publication Date:
03 Nov 2004
Publication Date:
01 Oct 1998
Article Category:
Research Article
DOI:
https://doi.org/10.1023/a:1010101926520
Keywords:
complexation; copper(II) complexes; tetraphenylporphyrin; thermokinetics
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Abstract  

Porphyrins are known as unique ligands forming some of the most stable complexes with various metal ions. In this work the thermokinetic investigations of complex formation of tetraphenylporphyrins with copper(II) acetate were carried out in two anhydrous organic solvents: acetic acid and DMF at 25C. Measurements were performed in a heat conduction microcalorimeter [7] adapted for non-aqueous solvents. Total heat effects and thermokinetics were determined. The results were discussed together with spectrophotometric data. Taking into account the high stability of metalloporphyrin complexes, the heat of their formation is rather small (in the case of acetic acid ΔQ=32.71.2 kJ mol−1, for DMF ΔQ=26.21.3 kJ mol−1). Such result can suggest that: 1) the stability of complexes is influenced strongly by an entropy factor, 2) the complexation involves breaking of the NH-bond in the porphyrin coordination centre, accompanied by high consumption of energy.

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Cover Journal of Thermal Analysis and Calorimetry
Journal of Thermal Analysis and Calorimetry
Print ISSN:
1388-6150
Online ISSN:
1572-8943

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Journal of Thermal Analysis and Calorimetry
Language English
Size A4
Year of
Foundation		 1969
Volumes
per Year		 1
Issues
per Year		 24
Founder Akadémiai Kiadó
Founder's
Address		 H-1117 Budapest, Hungary 1516 Budapest, PO Box 245.
Publisher Akadémiai Kiadó
Springer Nature Switzerland AG
Publisher's
Address		 H-1117 Budapest, Hungary 1516 Budapest, PO Box 245.
CH-6330 Cham, Switzerland Gewerbestrasse 11.
Responsible
Publisher		 Chief Executive Officer, Akadémiai Kiadó
ISSN 1388-6150 (Print)
ISSN 1588-2926 (Online)

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