X-Ray Diffraction Study of Some Liquid Naphthalene Derivatives

Abstract

The structure of the liquids 1-Methylnaphthalene C₁₀H₇—CH₃ and 1-Chloronaphthalene C₁₀H₇—Cl was investigated using X-ray diffraction at 293 K. Monochromatic radiation MoK_α (λ = 0.7107Å) enabled determination of the scattered radiation inteasity between S₀ = 4\pi sin υ₀/λ = 0.430 Å^?1 and S _max = 14.311 Å-1. Angular distributions of X-ray scattered intensity were measured, and differential radial distribution functions of electron density (DRDFs) were calculated. The mean distances between the neighbouring molecules and the ranges of the spheres of intermolecular ordering were found. X-ray structural analysis was applied for determination of the packing coefficient of molecules of the liquids studied. A simple model of short-range arrangement of the molecules was proposed, which seems to be valid for other weakly polar monosubstituted naphthalene derivatives in the liquid phase.