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• 1. DFT of Naphazoline By-  Vijay Narayan Mishra1*, Anoop Kumar Pandey2, Saiful Islam Ansari1  
  ( Posted On : 14-05-2017 )

The relative merits of refractive index deviation (Δn) and molar refraction deviation (ΔR_m) as indicators of molecular interactions in binary liquid mixtures are examined. Using experimental data, from literature, for six ethyl chloroacetate + n-alkane (C6 to C12) systems at three temperatures, we investigate whether these two widely-used parameters provide equivalent information. Our analysis reveals strong linear correlations (r > 0.95 in most cases) between ΔR_m and Δn, with both parameters showing identical signs and nearly coincident peak positions. A systematic scaling relationship ΔR_m ≈ k × Δn is observed, where the scaling factor k increases from 0.04 for hexane to 1.9 for dodecane. Temperature sensitivity analysis indicates that both parameters respond similarly to thermal changes. These findings suggest that ΔR_m and Δn may be considered practically equivalent for qualitative interaction assessment, though ΔR_m appears more suitable for systems with significant volume changes. The choice between them can be guided by available data and required measurement precision.

- Mohd. Aleem Khan1, Isht Vibhu2*, Vishal Singh Chandel3 *