Masoud, M., Hassan, A., Desouky, N., kamel, H., El-Kholany, A. (2020). Thermal and potentiometric studies for complexes of Zr and Hf with some barbituric acid derivatives. test, 10(10), 1-22. doi: 10.1088/1757-899X/975/1/012015
M S Masoud; A S Hassan; N M Desouky; H M kamel; A S El-Kholany. "Thermal and potentiometric studies for complexes of Zr and Hf with some barbituric acid derivatives". test, 10, 10, 2020, 1-22. doi: 10.1088/1757-899X/975/1/012015
Masoud, M., Hassan, A., Desouky, N., kamel, H., El-Kholany, A. (2020). 'Thermal and potentiometric studies for complexes of Zr and Hf with some barbituric acid derivatives', test, 10(10), pp. 1-22. doi: 10.1088/1757-899X/975/1/012015
Masoud, M., Hassan, A., Desouky, N., kamel, H., El-Kholany, A. Thermal and potentiometric studies for complexes of Zr and Hf with some barbituric acid derivatives. test, 2020; 10(10): 1-22. doi: 10.1088/1757-899X/975/1/012015

Thermal and potentiometric studies for complexes of Zr and Hf with some barbituric acid derivatives

The International Conference on Chemical and Environmental Engineering
Volume 10, Issue 10, July 2020, Pages 1-22    PDF (1.27 M)
Document Type: Original Article
DOI: 10.1088/1757-899X/975/1/012015
Authors
M S Masoud1; A S Hassan1; N M Desouky1; H M kamel2; A S El-Kholany2
1Chemistry Department, Faculty of Science, Alexandria University, Egypt.
2Medical Laboratory Department, Faculty of Allied Medical Sciences, Pharos University in Alexandria, Egypt.
Abstract
The complexes of Barbital (Bal), Thiobarbituric acid thione (TBA), Thiobarbituric acid thiol (2-TBA), 2-Thiouracil (TU) with Zr (IV) and Hf (IV) were prepared. The structures and mode of bonding were characterized by elemental analysis, IR and electronic spectroscopy. Thermal analyses of the prepared complexes were done by DTA, TG, DSC techniques. The thermodynamic parameters were evaluated. The change of entropy values, S#, for all the complexes lie within the range -0.267,-0.299 KjK-1 mol-1. The thermal processes proceed in complicated mechanisms with ordered transition states. In general, the complexes dissociated after losing small molecules such as H2O, Cl2 and CO. The decomposition is usually ended by the metal moiety. The DSC technique explained the effect of temperature on physical properties of some complexes. The glass transition phase doesn`t appear in all the complexes, while the crystallization temperature (Tc) was 780C-322.120C. Potentiometric titration studies calculated the dissociation constants of the ligands, the stability constants of the complexes and the distribution of species at different pH values.
Keywords
IR; DTA; TGA; DSC; Potentiometric titration; Complexes; Zr; Hf; Barbituric; Acid Derivatives
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