1
Chemistry Department, Faculty of Science, Alexandria University, Egypt.
2
Medical Laboratory Department, Faculty of Allied Medical Sciences, Pharos University in Alexandria, Egypt.
10.1088/1757-899X/975/1/012015
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.
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. The International Conference on Chemical and Environmental Engineering, 10(10), 1-22. doi: 10.1088/1757-899X/975/1/012015
MLA
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". The International Conference on Chemical and Environmental Engineering, 10, 10, 2020, 1-22. doi: 10.1088/1757-899X/975/1/012015
HARVARD
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', The International Conference on Chemical and Environmental Engineering, 10(10), pp. 1-22. doi: 10.1088/1757-899X/975/1/012015
VANCOUVER
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. The International Conference on Chemical and Environmental Engineering, 2020; 10(10): 1-22. doi: 10.1088/1757-899X/975/1/012015
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