pH-Metric studies of (2-pyrrole)-(5,6-diphenyl-[1,2,4]-triazin-3-yl)hydrazone with inner transition metals
Samy, F., Taha, A., Seleem, H., Ramadan, A. (2020). pH-Metric studies of (2-pyrrole)-(5,6-diphenyl-[1,2,4]-triazin-3-yl)hydrazone with inner transition metals. EKB Journal Management System, 63(11), 4243-4252. doi: 10.21608/ejchem.2020.12631.1783
Fatma Samy; Ali Taha; Hussein Saker Seleem; Atef A.T. Ramadan. "pH-Metric studies of (2-pyrrole)-(5,6-diphenyl-[1,2,4]-triazin-3-yl)hydrazone with inner transition metals". EKB Journal Management System, 63, 11, 2020, 4243-4252. doi: 10.21608/ejchem.2020.12631.1783
Samy, F., Taha, A., Seleem, H., Ramadan, A. (2020). 'pH-Metric studies of (2-pyrrole)-(5,6-diphenyl-[1,2,4]-triazin-3-yl)hydrazone with inner transition metals', EKB Journal Management System, 63(11), pp. 4243-4252. doi: 10.21608/ejchem.2020.12631.1783
Samy, F., Taha, A., Seleem, H., Ramadan, A. pH-Metric studies of (2-pyrrole)-(5,6-diphenyl-[1,2,4]-triazin-3-yl)hydrazone with inner transition metals. EKB Journal Management System, 2020; 63(11): 4243-4252. doi: 10.21608/ejchem.2020.12631.1783

pH-Metric studies of (2-pyrrole)-(5,6-diphenyl-[1,2,4]-triazin-3-yl)hydrazone with inner transition metals

Egyptian Journal of Chemistry
Article 9, Volume 63, Issue 11, November 2020, Page 4243-4252  XML PDF (1.04 MB)
Document Type: Original Article
DOI: 10.21608/ejchem.2020.12631.1783
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Authors
Fatma Samy email orcid 1; Ali Taha1; Hussein Saker Seleem2; Atef A.T. Ramadan2
1Department of Chemistry, Faculty of Education, Ain Shams University, Roxy, Cairo 11341, Egypt
2Department of Chemistry, Faculty of Education, Ain Shams University, Roxy, Cairo 11341, Egypt.
Abstract
The reaction of (2-pyrrole)-(5,6-diphenyl-[1,2,4]-triazin-3-yl)hydrazone with trivalent 4f lanthanide metal ions (LaIII, PrIII, NdIII, SmIII, EuIII, GdIII, TbIII, DyIII, HoIII, ErIII and YbIII) and 5f actinide metal ion UO2II has been studied potentiometrically in 75% (v/v) dioxane-water; at 283, 293, 303 and 313K. The ligand behaves as mono-protic species with the dissociation of hydrazo group proton and reacts with metal ion in molar ratio 1:2; M:L in solution. The formation constants were caulculated, which decrease as temprerature increases. The negative values of ΔH° and ΔG° indicate that the complexation are exothermic and proceeds spontaneously, respectivily. The electrostatic forces are weaker than non-electrostatic forces, where -DG°non is lower than -DG°el.
Keywords
pyrrole; hydrazone; triazine; pH-metric studies
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