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The dielectric relaxation studies are vital in analyzing the strength of the inter molecular interaction between the binary liquid systems [1-4]. Jyostna et al. [5] reported thermodynamic parameters of isoamyl alcohols and mono clinic aromatic liquid mixtures. Shakila et al. [6] studied the dielectric properties of aromatic alcohols and aliphatic amines at different temperatures. In general, dielectric relaxation time varies with the inter molecular forces acting between the molecules in the selected liquid mixtures. Brompheniramine is one of the critical compounds of an amine group with spectacular applications, including pharmaceutical industries [7]. Higher carbon chain length alcohols are having self associated and proton donating ability in the liquid mixtures. The variations in the dielectric constant (є’), dielectric loss (є’’), static dielectric constant (є0) and the dielectric constant at an optical frequency (є∞) with a range of brompheniramine concentrations with 1-butanol,1-pentanol and 1-hexanol systems are useful in the applied research and chemical industries. Moreover, the variations in the dielectric constant and dielectric relaxation time should be useful in the analysis of intermolecular interaction between the functional group of the selected liquid mixtures. This research work attempts to analyse the intermolecular interaction between the brompheniramine and 1-butanol,1-pentanol and 1-hexanol at 303K using time domain reflectometry techniques.

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Density (ρ), viscosity (η) and ultrasonic velocity (U) of chlorpheniramine with 1-ethanol mixtures are measured in a range of temperatures 303K, 308K and 313K. By using the systematic measurements, various physico chemical quantities, adiabatic compressibility (β), free length (Lf), free volume (Vf), viscous relaxation time (τ) and Gibbs free energy (ΔG) are attained. The deviations of those quantities to their ideal values are derived and revealed with the intermolecular interactions. The standard deviations and the coefficients of Redlich Kister polynomials of excess quantities are also determined to validate the calculations. From these observations, the existence of intermolecular interaction is confirmed and the strength of interactions with the temperatures as 303K>308K>313 K.