Oxidation of Nicotinic Acid Hydrazide (NH) And Iso-Nicotinic Acid Hydrazide(INH) by Iron(III) in Presence of Triazines (PDTS & PPDTS): A Mechanistic Study

Authors(2) :-A. Vasudeva Rao, Ch. Nageswara Rao

Oxidation of nicotinic acid hyrazide (NH) and iso-nicotinic acid hydrazide (INH) by iron(III) in presence of triazines (i.e. 3-((2-pyradyl)-5,6-bis(4-pehnyl sulphonic acid),-1,2,4 triazine (PDTS), 3-(4-(4-phenyl sulphonci)-2-pyridyl)-5,6-bis(4-phenylsulphonic acid)-1,2,4-triazine (PPDTS)) has been studied. These reactions enhanced in presence of triazines due to increase redox potential of Fe(III)/Fe(II) couple and also iron(III) acts as better oxidizing agent in presence of triazines. The oxidation of nicotinic acid hydrazide/ iso nicotinic hydrazide by iron(III) in the presence of PDTS is first order with respect to Fe(III). The reactions are accelerated by PDTS and plots of 1/kobs versus 1/[PDTS]2 are straight lines with positive slopes and positive intercepts on the ordinate indicating the formation of a 1:2 complex between Fe(III) and PDTS. It has also been observed that these reactions are decelerated by H+ ion. Iron(III) exists mainly as hexa aquoiron(III) under the present experimental conditions. Activation parameters have been computed. Specific rate constants (k) and equilibrium constants (K1 and K2) for iron(III)-PDTS-NH and iron(III)-PDTS-INH are nearly equal. This indicates that these two isomers show similar activity towards oxidation by iron(III). A similar trend is also noticed in the oxidation of NH/INH by iron(III) in the presence of PPDTS. The PDTS systems exhibit higher ΔH# values than the PPDTS systems. The entropies of activation, ΔS# for these reactions also fall in line with this analysis. ΔS# values are the lowest in the PPDTS systems which indicates that the transition states are highly ordered compared to those in the presence of PDTS.

Authors and Affiliations

A. Vasudeva Rao
Department of Chemistry, A.M.A.L . College, Anakapalli, Andhra Pradesh,India
Ch. Nageswara Rao
Department of Chemistry, Dadi institute of Engineering & Technology, Visakhapatnam, Andhra Pradesh, India

Oxidation, Fe(III), PDTS, PPDTS, Hydrazides And Kinetics

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Publication Details

Published in : Volume 4 | Issue 1 | January-February 2018
Date of Publication : 2018-02-28
License:  This work is licensed under a Creative Commons Attribution 4.0 International License.
Page(s) : 582-591
Manuscript Number : IJSRSET1841125
Publisher : Technoscience Academy

Print ISSN : 2395-1990, Online ISSN : 2394-4099

Cite This Article :

A. Vasudeva Rao, Ch. Nageswara Rao, " Oxidation of Nicotinic Acid Hydrazide (NH) And Iso-Nicotinic Acid Hydrazide(INH) by Iron(III) in Presence of Triazines (PDTS & PPDTS): A Mechanistic Study, International Journal of Scientific Research in Science, Engineering and Technology(IJSRSET), Print ISSN : 2395-1990, Online ISSN : 2394-4099, Volume 4, Issue 1, pp.582-591, January-February-2018.
Journal URL : http://ijsrset.com/IJSRSET1841125

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