Structure of 2,3,5,6-Tetraiodo-1,4-Benzenedicarboxylic Acid and Features of the Thermolysis of Iodinated Terephthalic Acids

The crystal structure of 2,3,5,6-tetraiodo-1,4-benzenedicarboxylic acid dihydrate is described and the following structural features are established by XRD: C 8 H 6 I 4 O 6 , M 705.73; monoclinic crystal system, P 2 1 / n space group; unit cell parameters: a  = 5.78160(10) Å, b  = 15.0976(2) Å, c  =...

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Bibliographic Details
Published in:Journal of structural chemistry 2024-07, Vol.65 (7), p.1346-1356
Main Authors: Polozov, M. A., Zherebtsov, D. A., Osipov, A. A., Radzhakumar, K., Naifert, S. A., Spiridonova, D. V., Zaguzin, A. S., Vinnik, D. A.
Format: Article
Language:English
Subjects:
Atomic
Atomic/Molecular Structure and Spectra
Chemistry
Chemistry and Materials Science
Crystal structure
Heat of fusion
Inorganic Chemistry
Iodine
Molecular
Optical and Plasma Physics
Physical Chemistry
Solid State Physics
Terephthalic acid
Thermal stability
Unit cell
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Summary:The crystal structure of 2,3,5,6-tetraiodo-1,4-benzenedicarboxylic acid dihydrate is described and the following structural features are established by XRD: C 8 H 6 I 4 O 6 , M 705.73; monoclinic crystal system, P 2 1 / n space group; unit cell parameters: a  = 5.78160(10) Å, b  = 15.0976(2) Å, c  = 17.3437(3) Å; α = 90°, β = 94.602(2)°, γ = 90°; V  = 1509.02(4) Å 3 , Z  = 4, ρ calc  = 3.106 g/cm 3 . Some features of the thermolysis of terephthalic acid and its iodine derivatives are described. Diiodoterephthalic acid is the least thermally stable, tetraiodoterephthalic acid is the most stable. The iodinated terephthalic acids have similar heats of fusion. The largest amount of carbon residue is formed during the decomposition of 2,3,5,6-tetraiodo-1,4-benzenedicarboxylic acid.
ISSN:0022-4766
1573-8779
DOI:10.1134/S0022476624070060