1Department of Chemistry, Geethanjali College of Engineering and Technology, Cheeryal-501301, Telangana, India
2Department of Chemistry, Osmania University, Hyderabad-500007, India
World Journal of Chemical Education.
2022,
Vol. 10 No. 3, 91-94
DOI: 10.12691/wjce-10-3-1
Copyright © 2022 Science and Education PublishingCite this paper: R. Sanjeev, V. Jagannadham. Effect of Pyridine Type Nitrogen (=N-) on Hammett ρ: Invoking the Reactivity-Selectivity Principle: A Chemical Education Perspective.
World Journal of Chemical Education. 2022; 10(3):91-94. doi: 10.12691/wjce-10-3-1.
Correspondence to: V. Jagannadham, Department of Chemistry, Osmania University, Hyderabad-500007, India. Email:
jagannadham1950@yahoo.comAbstract
Hammett ρ values are estimated for the two acid dissociation equilibriums eqn. 1 and 2 of pyridinium and pyridazenium ions from the Hammett plots of log
KaH versus Hammett σ values. The Hammett ρ values are found to be 5.94 and 5.29 for the two equilibriums eqns. 1 and 2 respectively. The effect of extra pyridine type nitrogen (=N-) on Hammett ρ is discussed. Similarly, the average lone pair ionization potentials (IP) of pyridines and pyridazines also followed Hammett equation with Hammett ρ of 1.18 for pyridines and 0.38 for pyridazines respectively. This article is useful in an undergraduate and graduate classroom who tries to study the substituent effects and reactivity-selectivity principle.
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