Ion-Solvation Behavior of Heterocyclic Dichromates in Aqueous-Organic Solvent Mixtures
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RESEARCH ARTICLE
Ion-Solvation Behavior of Heterocyclic Dichromates in AqueousOrganic Solvent Mixtures Veerati Radhika1
Received: 6 October 2017 / Revised: 1 May 2019 / Accepted: 25 May 2019 Ó The National Academy of Sciences, India 2019
Abstract The paper explores solvation behavior of nicotinium, pyridinium, quinolinium dichromates at 288–318 K in acetone, water and varying compositions of water–acetone (v/v). Analysis of conductance data to obtain k0 is on the lines of Kraus–Bray and Shedlovsky models. k0, the limiting molar conductance, increased with increase in the proportion of water in the solvent mixture. This is used in the understanding of the favored/discerning solvation of cations by acetone. The influence of mixed solvent composition on the solvation of ions is discussed in tune with the composition dependence of Walden product. The influence of the mixed solvent composition on the solvation of ions has been discussed with the help of ‘R’-factor. Keywords Ion-pair association steady Ion-pair dissociation steady Solvation number R-factor Limiting molar conductance Heterocyclic dichromate
1 Introduction Quinolinium dichromate is a suitable oxidant which was prepared by Prathiba and others in 1986 [1]. This was used as an oxidant in the kinetic studies of oxidation of various components [2–4], Solvation behavior of this oxidant in
Significance statement The influence of mixed solvent k composition on the solvation of ions is discussed in tune with the composition dependence of Walden product and ‘R’-factor. & Veerati Radhika [email protected] 1
Department of Chemistry, S R Engineering College, Warangal 506371, India
aqueous-DMF was presented in our previous paper [5]. Pyridinium dichromate is a steady oxidant which was primed and analyzed by Corey et al. [6], and pyridinium dichromate has emerged as a very useful and versatile oxidant which can be used in many applications [7–9]. Nicotinium dichromate was prepared and analyzed by Lopez and co-workers [10], and it works as stable oxidant [11]. More literature is available on kinetic aspects of these three oxidants, but none of it is proposed based on conductance behavior. Density, viscosity and dielectric constant of the medium, ion–solvent and solvent–solvent interactions influence conductance behavior of electrolytes in binary solvent mixtures. Ion– solvent interactions stabilize the ion by solvating it which in turn is substantiated through information [12–16]. Ionic Conductivity and its role in Oxidation Reactions by Mazin Abdulla Tamimi [17]. Conductivity study is of immense importance in obtaining in sequence regarding the solvation and association behavior of ions in solution. The solvation of dissolved ion determines many properties of electrolyte solutions [18], including their redox, complexation and kinetic behavior. The present paper details the observations on conductance behavior of quinolinium, pyridinium and nicotinium dichromates in dual solvent mixtures of aqueous acetone, partial aqueous solvents, i.e., aqueous
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