Time Domain Reflectometric Studies on Methylcellosolve – Acetylacetone Binary Solutions

Time Domain Reflectometric studies has been applied on the binary solutions of methylcellosolve (MCS) with acetylacetone (ACACT) in the entire concentration range at 298 K in the frequency range of 10 MHz – 32 GHz. The values of relaxation time (τ), effective Kirkwood correlation factor (geff ), corrective Kirkwood correlation factor (gf ) and excess permittivity (εE ) have been calculated. The relaxation time of MCS slowly decreases with increase in ACACT concentration suggesting that the size of the heteroassociated rotating unit decreases. The rate at which τ value decreases is more in MCS rich solutions which means that the formation of heteromolecular H – bonds dominantly occur in MCS rich solutions. Parallel orientation among the dipoles occur as suggested by the g^eff values which are greater than unity in all the solutions. The excess permittivity ε^E values calculated using mole and volume fractions qualitatively exhibit the same deviation from ideal behaviour.

Prediction of Dielectric Constants of (Cyclic Ketone- 1,4-Butanediol) Binary Systems

In order to predict the permittivity and excess permittivity data of binary systems containing cyclic ketones (cyclohexanone and cyclopentanone) and 1,4-butanediols, various mixing rules were used [1,2]. The permittivity increment, , was also evaluated in this research using the predicted data. x1 and x2 are the mole fractions of the components 1 and 2, and are the permittivities of the pure components. As shown in Fig. 1, the experimental permittivity values for three systems containing 1,4-butanediol (1,4BD) and two cyclic ketones were estimated by several mixing rules. Typically, for cyclohexanone and 1,4-butanediol mixtures, the predicted excess permittivity data were compared and shown in Fig. 2. As it can be seen from Table 1, the Lichteneker-Rother model shows the lower root mean square deviation (rmsd) value, which indicates that the Lichteneker-Rother model presents the best result between the predictive models.

Dielectric, Thermodynamic, and Computational Studies of Hydrogen Bonded Binary Mixtures of N-Methylaniline with Propan-1-ol and Isopropyl Alcohol

The molecular interactions between the polar systems N-methylaniline with alcohols, propan-1-ol, and isopropyl alcohol for various mole fractions at different temperatures are studied by determining the dielectric permittivity using LF impedance analyzer, microwave bench, and Abbe's refractometer in radio, microwave, and optic frequency regions, respectively. Dipole moment, excess dipole moment, excess Helmholtz free energy, excess permittivity, excess inverse relaxation time, and excess thermodynamical values are calculated using experimental data. Hamiltonian quantum mechanical calculations are performed using PC Spartan and ArgusLab modeling softwares for both pure and equimolar binary systems of N-methyl aniline with alcohols.