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Issue 43, 2010
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Ion association and solvation behavior of tetraalkylammonium iodides in binary mixtures of dichloromethane + N,N-dimethylformamide probed by a conductometric study

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Abstract

Precise measurements on electrical conductances of tetraalkylammonium iodides, R4NI (R = n-butyl to n-heptyl), in different mass% (0–100) of dichloromethane (DCM) + N,N-dimethylformamide (DMF) at 298.15 K have been performed. Limiting molar conductances (Λ0), association constants (KA) and co-sphere diameter (R) for ion-pair formation in the mixed solvent mixtures have been evaluated using the Fuoss conductance-concentration equation. However, the deviation of the conductometric curves (Λversus c) from linearity for the electrolytes in 100 mass% of DCM indicated triple ion formation, and therefore corresponding conductance data have been analyzed by the Fuoss-Kraus theory of triple ions. Limiting ionic molar conductances λ±0 have been calculated by the reference electrolyte method along with a numerical evaluation of ion pair and triple ion formation constants (KPKA and KT). The results have been interpreted in terms of ion–solvent interactions and structural changes in the mixed solvents.

Graphical abstract: Ion association and solvation behavior of tetraalkylammonium iodides in binary mixtures of dichloromethane + N,N-dimethylformamide probed by a conductometric study

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Publication details

The article was received on 11 May 2010, accepted on 09 Aug 2010 and first published on 07 Oct 2010


Article type: Paper
DOI: 10.1039/C0CP00532K
Citation: Phys. Chem. Chem. Phys., 2010,12, 14534-14542
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    Ion association and solvation behavior of tetraalkylammonium iodides in binary mixtures of dichloromethane + N,N-dimethylformamide probed by a conductometric study

    A. Bhattacharjee and M. N. Roy, Phys. Chem. Chem. Phys., 2010, 12, 14534
    DOI: 10.1039/C0CP00532K

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